CN110590427A - Special fertilizer for tea and preparation method thereof - Google Patents

Abstract

The invention relates to a special fertilizer for tea and a preparation method thereof. The special fertilizer for tea comprises the following raw materials in percentage by mass: 55 to 75 percent of nitramine phosphate fertilizer, 1 to 3 percent of ammonium sulfate, 5 to 15 percent of monoammonium phosphate, 15 to 30 percent of potassium sulfate, 1 to 5 percent of potassium fulvate, 0.5 to 2 percent of polyglutamic acid and 0.5 to 1 percent of trace element chelating agent. The special fertilizer for tea can improve the yield and quality of tea.

Description

Special fertilizer for tea and preparation method thereof

Technical Field

The invention relates to the field of fertilizers, in particular to a special fertilizer for tea and a preparation method thereof.

Background

With the continuous improvement of the living standard of people, the requirement of people on the quality of tea is continuously improved while the demand of tea is continuously increased. The fertilizer is a necessary nutrient element for providing tea, can change soil components, improve soil fertility and increase soil organic substances. Therefore, the reasonable fertilization plays a decisive role in the growth and development of the tea, the promotion of the metabolism of crops, the improvement of the quality of the tea and the yield of unit area.

However, the compound fertilizer on the current market cannot meet the nutrition required by tea trees, so that the quality of tea leaves is poor and the yield is low.

Disclosure of Invention

Therefore, a special fertilizer for tea leaves is needed to improve the quality and yield of the tea leaves.

In addition, a preparation method of the special fertilizer for tea is also provided.

The special fertilizer for tea comprises the following raw materials in percentage by mass:

the special fertilizer for tea has reasonable raw material proportion and contains the nutrition required by the growth of tea trees; meanwhile, potassium fulvate, polyglutamic acid and chelated trace elements are added into the ammonium nitrate phosphate fertilizer, so that the content of organic carbon in soil can be effectively increased, the nutritional structure of the soil is conditioned, the growth of root systems is promoted, the freezing injury in early spring is prevented, the yield of tea leaves is improved, the content of free amino acid in the tea leaves can be improved, the phenol-ammonia ratio is reduced, and the quality of the tea leaves is improved.

In one embodiment, the ammonium phosphate fertilizer contains nitrogen, phosphorus pentoxide and potassium oxide, and the total mass percentage of the nitrogen, the phosphorus pentoxide and the potassium oxide in the ammonium phosphate fertilizer exceeds 36.0%.

In one embodiment, the ammonium nitrate phosphate fertilizer contains chloride ions, and the mass percentage of the chloride ions in the ammonium nitrate phosphate fertilizer is less than 3.0%.

In one embodiment, the potassium fulvate contains humic acid, and the content of humic acid in the potassium fulvate is more than 50% by mass.

In one embodiment, the potassium fulvate contains fulvic acid, and the fulvic acid is contained in the potassium fulvate in an amount of more than 50% by mass.

In one embodiment, the potassium fulvate is mineral potassium fulvate.

In one embodiment, the polyglutamic acid has a molecular weight of 800kDa to 2000 kDa.

In one embodiment, the trace elements of the trace element chelator include calcium, magnesium, zinc, and boron.

In one embodiment, in the trace element chelating agent, the mass percentage of calcium exceeds 0.1%, the mass percentage of magnesium exceeds 80ppm, the mass percentage of zinc exceeds 200ppm, and the mass percentage of boron exceeds 100 ppm.

A preparation method of a special fertilizer for tea comprises the following steps:

preparing the raw materials into the special tea fertilizer, wherein the special tea fertilizer comprises the following raw materials in percentage by mass:

Detailed Description

The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The special fertilizer for tea is prepared from the following raw materials in percentage by mass:

the ammonium nitrate phosphate fertilizer is a medium-concentration compound fertilizer. Wherein, the total mass percentage of nitrogen element, phosphorus pentoxide and potassium oxide in the nitramon phosphate fertilizer exceeds 36.0 percent, the percentage of water-soluble phosphorus occupying effective phosphorus exceeds 50 percent, and the water content (H) is₂O) less than 2.5 percent by mass, more than 90 percent of particles with the particle diameter of 1.00-4.75 mm, and chloride ions (Cl)^-) The mass percentage of (B) is less than 3.0%.

Ammonium sulfate is a white crystal. Wherein the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent. Specifically, the ammonium sulfate is produced by China petrochemical industry, and is agricultural grade ammonium sulfate.

The monoammonium phosphate is a powdery solid. Wherein, the mass percent of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percent of the phosphorus pentoxide exceeds 50 percent.

Potassium sulfate is an important chlorine-free potassium fertilizer containing sulfur and potassium elements. Wherein, the potassium sulfate is powdery solid, and the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent.

Wherein the mass ratio of the potassium fulvate to the ammonium nitrate phosphate fertilizer is 1: 11-1: 75. Specifically, the potassium fulvate is mineral potassium fulvate. The mineral source potassium fulvate is a high-activity substance extracted from natural minerals (lignite and peat), is purely natural, non-toxic and harmless, contains a high-activity short carbon chain micromolecular structure, and has the effect of activating nutrients in soil. Wherein, the humic acid content in the mineral potassium fulvate exceeds 50 percent by mass, the fulvic acid content exceeds 50 percent by mass, the potassium oxide content exceeds 12 percent by mass, and the moisture content is below 15 percent by mass. Further, the pH value of the mineral source potassium fulvate is 8-12; the water-soluble components in the mineral potassium fulvate exceed 95 percent.

Wherein the mass ratio of the polyglutamic acid to the nitramine phosphate fertilizer is 1: 22.5-1: 150. Polyglutamic acid is a biopolymer produced by a microbial fermentation process. Further, the molecular weight of polyglutamic acid is 800kDa to 2000 kDa. Specifically, the polyglutamic acid is gamma-polyglutamic acid.

Wherein the mass ratio of the trace element chelating agent to the nitramine phosphate fertilizer is 1: 55-1: 150. The trace element chelating agent is a composite chelating powder rich in trace elements, wherein the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron. Furthermore, in the trace element chelating agent, the mass percent of calcium exceeds 0.1%, the mass percent of magnesium exceeds 80ppm, the mass percent of zinc exceeds 200ppm, and the mass percent of boron exceeds 100 ppm.

The special fertilizer for tea has reasonable raw material proportion and contains the nutrition required by the growth of tea trees; meanwhile, potassium fulvate, polyglutamic acid and chelated trace elements are added into the ammonium nitrate phosphate fertilizer, so that the content of organic carbon in soil can be effectively increased, the nutritional structure of the soil is conditioned, the growth of root systems is promoted, the freezing injury in early spring is prevented, the yield of tea leaves is improved, the content of free amino acid in the tea leaves can be improved, the phenol-ammonia ratio is reduced, and the quality of the tea leaves is improved.

The special fertilizer for tea is prepared by adding mineral potassium fulvate, polyglutamic acid and chelated trace elements into the ammonium nitrate phosphate fertilizer compound fertilizer through the auxiliary technologies of an Intelligent Trace Element (TE) technology and an organic addition technology, so that the content of organic carbon in soil can be effectively increased, the soil is conditioned, the root system growth is promoted, the content of free amino acid in tea is increased, the phenol-ammonia ratio is reduced, and the tea quality is improved.

The preparation method of the tea leaf special fertilizer according to the embodiment comprises the following steps:

preparing the raw materials into a tea leaf special fertilizer, wherein the tea leaf special fertilizer comprises the following raw materials in percentage by mass: 55 to 75 percent of nitramine phosphate fertilizer, 1 to 3 percent of ammonium sulfate, 5 to 15 percent of monoammonium phosphate, 15 to 30 percent of potassium sulfate, 1 to 5 percent of potassium fulvate, 0.5 to 2 percent of polyglutamic acid and 0.5 to 1 percent of trace element chelating agent. The special fertilizer for tea prepared by the preparation method for the special fertilizer for tea can improve the yield and quality of tea.

Further, the raw materials are prepared into the special fertilizer for the tea by adopting a high tower granulation process. The fertilizer special for tea prepared by adopting the high tower granulation process has low moisture content, does not need a drying process, and greatly saves energy consumption; the percentage content of qualified product particles in the production is very high, and the amount of returned materials in the production process is almost zero; good operation environment and no three-waste discharge, and belongs to a clean production process.

The following are specific examples:

example 1

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 60% of nitramine phosphate fertilizer, 2% of ammonium sulfate, 8% of monoammonium phosphate, 24% of potassium sulfate, 3% of mineral potassium fulvate, 2% of polyglutamic acid and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus occupied by water-soluble phosphorus exceeds 50%, the mass percentage of moisture is below 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is below 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 2

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 60% of nitramine phosphate fertilizer, 2% of ammonium sulfate, 10% of monoammonium phosphate, 23% of potassium sulfate, 3% of mineral potassium fulvate, 1% of polyglutamic acid and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus occupied by water-soluble phosphorus exceeds 50%, the mass percentage of moisture is less than 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is less than 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 3

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 65% of nitramine phosphate fertilizer, 1% of ammonium sulfate, 8% of monoammonium phosphate, 21.5% of potassium sulfate, 3% of mineral potassium fulvate, 1% of polyglutamic acid and 0.5% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus in water-soluble phosphorus exceeds 50%, the mass percentage of moisture is less than 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is less than 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 4

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 65% of nitramine phosphate fertilizer, 1% of ammonium sulfate, 8% of monoammonium phosphate, 21.5% of potassium sulfate, 3% of mineral potassium fulvate, 0.5% of polyglutamic acid and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus in water-soluble phosphorus exceeds 50%, the mass percentage of moisture is less than 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is less than 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 5

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 65% of nitramine phosphate fertilizer, 1% of ammonium sulfate, 8% of monoammonium phosphate, 22% of potassium sulfate, 3% of mineral potassium fulvate, 0.5% of polyglutamic acid and 0.5% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus in water-soluble phosphorus exceeds 50%, the mass percentage of moisture is less than 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is less than 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 6

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 65% of nitramine phosphate fertilizer, 1% of ammonium sulfate, 8% of monoammonium phosphate, 23% of potassium sulfate, 1% of mineral potassium fulvate, 1% of polyglutamic acid and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus occupied by water-soluble phosphorus exceeds 50%, the mass percentage of moisture is less than 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is less than 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 7

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 55% of nitramine phosphate fertilizer, 2% of ammonium sulfate, 5% of monoammonium phosphate, 30% of potassium sulfate, 5% of mineral potassium fulvate, 2% of polyglutamic acid and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus occupied by water-soluble phosphorus exceeds 50%, the mass percentage of moisture is below 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is below 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 8

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 75% of nitramine phosphate fertilizer, 1% of ammonium sulfate, 5% of monoammonium phosphate, 17% of potassium sulfate, 1% of mineral potassium fulvate, 0.5% of polyglutamic acid and 0.5% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus in water-soluble phosphorus exceeds 50%, the mass percentage of moisture is less than 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is less than 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Example 9

The fertilizer special for tea in the embodiment is prepared from raw materials through a high tower granulation process, and the raw materials of the fertilizer special for tea comprise, by mass: 59% of nitramon phosphate fertilizer, 3% of ammonium sulfate, 15% of monoammonium phosphate, 15% of potassium sulfate, 5% of mineral potassium fulvate, 2% of polyglutamic acid and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramon phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus occupied by water-soluble phosphorus exceeds 50%, the mass percentage of moisture is below 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is below 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Comparative example 1

The fertilizer special for tea in the comparative example is prepared from the following raw materials in parts by mass through an extrusion granulation process, wherein the raw materials of the fertilizer special for tea comprise: 39 parts of urea, 29 parts of ammonium sulfate, 12 parts of monoammonium phosphate, 20 parts of potassium sulfate, 1.5 parts of magnesium sulfate, 1.5 parts of zinc sulfate, 1.5 parts of ferrous sulfate, 1.5 parts of boric acid, 1.5 parts of borax, 1.5 parts of copper sulfate, 1.5 parts of ammonium molybdate, 6 parts of DMPP, 6 parts of N-butyl thiophosphoryl amide and 6 parts of gamma-polyglutamic acid.

Comparative example 2

The fertilizer special for tea in the comparative example is prepared from the following raw materials by a high tower granulation process, and comprises the following raw materials in percentage by mass: 63% of nitramine phosphate fertilizer, 2% of ammonium sulfate, 8% of monoammonium phosphate, 24% of potassium sulfate, 2% of polyglutamic acid and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the water-soluble phosphorus accounts for over 50%, the mass percentage of moisture is below 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is below 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Comparative example 3

The fertilizer special for tea in the comparative example is prepared from the following raw materials by a high tower granulation process, and comprises the following raw materials in percentage by mass: 62% of nitramine phosphate fertilizer, 2% of ammonium sulfate, 8% of monoammonium phosphate, 24% of potassium sulfate, 3% of mineral potassium fulvate and 1% of trace element chelating agent, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus occupied by water-soluble phosphorus exceeds 50%, the mass percentage of moisture is below 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is below 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron, wherein the mass percent of the calcium is more than 0.1%, the mass percent of the magnesium is more than 80ppm, the mass percent of the zinc is more than 200ppm, and the mass percent of the boron is more than 100 ppm.

Comparative example 4

The fertilizer special for tea in the comparative example is prepared from the following raw materials by a high tower granulation process, and comprises the following raw materials in percentage by mass: 61% of nitramine phosphate fertilizer, 2% of ammonium sulfate, 8% of monoammonium phosphate, 24% of potassium sulfate, 3% of mineral potassium fulvate and 2% of polyglutamic acid, wherein the total mass percentage of nitrogen elements, phosphorus pentoxide and potassium oxide in the nitramine phosphate fertilizer exceeds 36.0%, the percentage of effective phosphorus occupied by water-soluble phosphorus exceeds 50%, the mass percentage of moisture is below 2.5%, the mass percentage of particles with the particle size of 1.00-4.75 mm exceeds 90%, and the mass percentage of chloride ions is below 3.0%; the mass percentage of nitrogen in the ammonium sulfate exceeds 21 percent; the mass percentage of nitrogen in the monoammonium phosphate exceeds 10 percent, and the mass percentage of the phosphorus pentoxide exceeds 50 percent; the mass percentage of the potassium oxide in the potassium sulfate exceeds 52 percent; the mineral potassium fulvate contains more than 50% of humic acid, more than 50% of fulvic acid, more than 12% of potassium oxide, less than 15% of water, the pH value of the mineral potassium fulvate is 8-12, and the water-soluble components in the mineral potassium fulvate are more than 95%; the molecular weight of the polyglutamic acid is 800 kDa-2000 kDa.

And (3) agricultural chemical experiment:

selecting a young tea garden, evenly dividing the young tea garden into 11 parts of tea fields according to the area, respectively applying the nitrogen-phosphorus-potassium fertilizer, the special tea fertilizer of examples 1-9 and the special tea fertilizer of comparative examples 1-4 to the 11 parts of tea fields in 2-4 months, applying the fertilizers for 3 times once a month, and applying 10-20 kg/mu each time, wherein the nitrogen-phosphorus-potassium fertilizer is used as a blank control, and the content of nitrogen, phosphorus and potassium in the nitrogen-phosphorus-potassium fertilizer is 15-15-15 respectively. The root weight of tea tree, the root weight and root activity of tea tree, the content of free amino acids in tea leaves and the acre yield of dry tea in 11 parts of tea field were measured, and the results are shown in table 1.

TABLE 1

As can be seen from Table 1, compared with the tea field only applied with nitrogen, phosphorus and potassium fertilizers, the tea field applied with the special fertilizer for tea in the embodiments 1-9 has the advantages that the root weight of tea trees is improved by 20-70%, the root activity of the tea trees is improved by 70-110%, the content of free amino acids in the tea is improved by 30-70%, and the yield of dry tea per mu is improved by 40-100%. It is shown that the fertilizers for tea leaves of examples 1 to 9 have the effects of promoting the growth of the root system of tea trees, increasing the content of free amino acids in tea leaves and increasing the acre yield of dry tea.

Meanwhile, the root weight of the tea trees in the tea field applied with the special tea fertilizer in the comparative example 1 is improved by 7.95%, the root activity of the tea trees is improved by 19.5%, the content of free amino acids in the tea leaves is improved by 2.33%, the yield per mu of the dry tea is improved by 3.93%, and compared with the special tea fertilizer in the comparative example 1, the special tea fertilizer in the examples 1 to 9 has better effects on promoting the root growth of the tea trees, improving the content of free amino acids in the tea leaves and improving the yield per mu of the dry tea compared with the special tea fertilizer in the comparative example 1.

Compared with the fertilizer special for tea in the comparative example 2, the fertilizer special for tea in the examples 1 to 9 has better effects on improving the root weight of tea trees, improving the root activity of the tea trees, improving the content of free amino acids in the tea trees and improving the acre yield of dry tea than the fertilizer special for tea in the comparative example 2, and the fact that the mineral source potassium fulvate can promote the root growth of the tea trees, improve the content of the free amino acids in the tea trees and improve the acre yield of the dry tea is demonstrated.

Compared with the fertilizer special for tea leaves of comparative example 3, the fertilizer special for tea leaves of examples 1 to 9 was more effective in increasing the content of free amino acids in tea leaves than the fertilizer special for tea leaves of comparative example 3, indicating that polyglutamic acid can increase the content of free amino acids in tea leaves.

Compared with the fertilizer special for tea in the comparative example 4, the fertilizer special for tea in the examples 1 to 9 has better effects on improving the root activity of tea trees, the content of free amino acids in the tea leaves and the acre yield of dry tea than the fertilizer special for tea in the comparative example 4, and shows that the trace element chelating agent can promote the root growth of the tea trees, improve the content of the free amino acids in the tea leaves and improve the acre yield of the dry tea.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The fertilizer special for tea is characterized by comprising the following raw materials in percentage by mass:

2. the fertilizer special for tea leaves as claimed in claim 1, wherein the ammonium phosphate fertilizer contains nitrogen, phosphorus pentoxide and potassium oxide, and the total mass percentage of the nitrogen, the phosphorus pentoxide and the potassium oxide in the ammonium phosphate fertilizer exceeds 36.0%.

3. The fertilizer special for tea leaves as claimed in claim 1, wherein the ammonium nitrate phosphate fertilizer contains chloride ions, and the mass percentage of the chloride ions in the ammonium nitrate phosphate fertilizer is 3.0% or less.

4. The special fertilizer for tea leaves as claimed in claim 1, wherein the potassium fulvate contains humic acid, and the content of humic acid in the potassium fulvate is more than 50% by mass.

5. The special fertilizer for tea leaves as claimed in claim 1, wherein the potassium fulvate contains fulvic acid, and the mass percentage of fulvic acid in the potassium fulvate is more than 50%.

6. The special fertilizer for tea leaves as claimed in claim 1, wherein the potassium fulvate is mineral potassium fulvate.

7. The special fertilizer for tea leaves as claimed in claim 1, wherein the molecular weight of the polyglutamic acid is 800kDa to 2000 kDa.

8. The tea leaf special fertilizer according to claim 1, wherein the trace elements in the trace element chelating agent comprise calcium, magnesium, zinc and boron.

9. The special fertilizer for tea leaves as claimed in claim 8, wherein in the trace element chelating agent, the mass percentage of calcium exceeds 0.1%, the mass percentage of magnesium exceeds 80ppm, the mass percentage of zinc exceeds 200ppm, and the mass percentage of boron exceeds 100 ppm.

10. A preparation method of a special fertilizer for tea is characterized by comprising the following steps:

preparing the raw materials into the special tea fertilizer, wherein the special tea fertilizer comprises the following raw materials in percentage by mass: