CN104311236B - A kind of Water soluble fertilizer additive and its preparation method and application - Google Patents
A kind of Water soluble fertilizer additive and its preparation method and application Download PDFInfo
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- CN104311236B CN104311236B CN201410507804.0A CN201410507804A CN104311236B CN 104311236 B CN104311236 B CN 104311236B CN 201410507804 A CN201410507804 A CN 201410507804A CN 104311236 B CN104311236 B CN 104311236B
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- water soluble
- soluble fertilizer
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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Abstract
The invention provides a kind of Water soluble fertilizer additive, be specifically related to a kind of Water soluble fertilizer solubilising additive, it is characterized in that the weight part formed is: sulphonyl amino acid 85-90 part, dispersion wetting agent 5-8 part, ammonium polyphosphate 3-5 part, Ureaphil 1-2 part.Further, the invention provides the preparation method and application of this Water soluble fertilizer additive.This Water soluble fertilizer additive when solid-state and fertilizer can stablize and coexist, after water-soluble can fast electric from, impel insoluble calcium salt, magnesium salts and trace element to dissolve, and continuous chelating, finally make Water soluble fertilizer dissolve completely.Overcome insolubles in current Water soluble fertilizer, on the impact of fertigation, fertigation, punching fertilising, to have widened the selection of Water soluble fertilizer to chemical fertilizer raw material, reduced Water soluble fertilizer cost, there is good market using value.
Description
Technical field
The present invention relates to fertilizer additive, be specifically related to a kind of Water soluble fertilizer solubilising additive with and its preparation method and application.
Background technology
Traditional fertilizer adopts and manually spreads fertilizer over the fields or mechanical seed manure, along with the development of agricultural modernization and the fertile demand of water saving joint, water-fertilizer integral fertigation technology at raising utilization rate of fertilizer, save agricultural water, reduce ecological environmental pollution, improve crop quality and reduce in labor force etc. and show obvious advantage.Thus, water-soluble fertilizer or the fertilising of rushing that is suitable for fertigation become a kind of novel environment friendly fertilizer adapting to high-efficiency agriculture and sustainable agriculture development.
Water soluble fertilizer refers to the multielement compound fertilizer that can be dissolved in water completely, and compared with the kinds such as traditional calcium superphosphate, granulated compound fertilizer, water soluble fertilizer has obvious advantage.Its principal feature is that consumption is few, and easy to use, use cost is low, and Crop is fast.Therefore, water-soluble fertilizer is the first-selected fertilizer of high-efficiency agriculture, is also the essential fertilizer of arid area water-saving drip irrigation fertilising.
But because the fertile raw material of conventional composite scarcely possesses entirely water-soluble, as the fertilizer that ground phosphate rock, calcium superphosphate, fused(calcium magnesium)phosphate etc. are conventional in agricultural, because solvability is limited, the raw material of Water soluble fertilizer cannot be used as; Even if primary ammonium phosphate, saltpetre, potassium sulfate etc., as Water soluble fertilizer raw material, due to limited purity, are also difficult to meet completely water-soluble requirement preferably to select solubleness.Existing conventional fertilizers raw material becomes Water soluble fertilizer to be needed constantly to purify, and not only cause energy consumption to raise, cost increases, and nutritive element change is single.
Moreover, the complex body of Water soluble fertilizer normally various nutrient elements, because the performance of different fertilizer raw material there are differences in compound, the change of the Water soluble fertilizer be made up of plurality of raw materials self performance and environment in storing, using, causes the water-soluble variation of fertilizer, reacts to each other and generate precipitation time even water-soluble, this is serious defect to the use of Water soluble fertilizer, can not adapt to the requirement of water-fertilizer integral fertilising completely, not only can result in blockage pipeline, and fertilizer efficiency can heavy losses.
In order to promote that Water soluble fertilizer does not occur insolubles in mixture of multi-elements, Chinese invention patent CN100486941C discloses a kind of whole-nutrition biological flushing fertilising and preparation method thereof, employ ethylenediamine tetraacetic acid (EDTA) ferrous salt and citric acid in this chemical fertilizer as chaotropic agent, prevent the element in Water soluble fertilizer from occurring precipitation by complexing mode.The method is the conventional means at present for preventing Water soluble fertilizer reaction precipitation from adopting, because complex compound selectivity is strong, only to part aqueous positively charged ion, there is complexing effect, and more weak for negatively charged ion complexing, therefore cannot the Water soluble fertilizer of adaptive element complexity, only effective for limited moderate-element.And the not dissolved salt existed in Water soluble fertilizer is difficult to dissolve.
In order to promote solvability that is insoluble or slightly soluble fertilizer, Chinese invention patent CN102765984A discloses the preparation method that a kind of ultra micro urgees to release phosphate fertilizer, thick ground phosphate rock mixes with suitable phosphorus element activator compatibility by the method carries out subtle powder smash processing, thus impels the release of phosphorus.But this invention can not meet the completely water-soluble object of phosphate fertilizer.Chinese invention patent CN102502550A discloses a kind of supercarbonate that uses makes water-insoluble phosphorus transform into the method for water-soluble phosphate, the water-insoluble phosphoric acid salt produced in phosphate production process utilizes bicarbonate conversion to be water-soluble phosphate compounds by the method, but owing to producing the precipitations such as calcium carbonate simultaneously, need further filtering separation.
According to above-mentioned, the Water soluble fertilizer that adopts water-fertilizer integral spray drop to fill with preferably full water-soluble.And at present owing to limiting by raw material, China's main fertilizer raw material variety does not possess full water soluble characteristic, be especially difficult to dissolve containing insoluble calcium phosphate, magnesium salts etc. in fertilizer, cause these moderate-elements to be absorbed by plants.In addition, even if the moderate-element such as calcium ion, magnesium ion very easily forms not dissolved salt after dissolving, especially phosphoric exists in the form of phosphate, very easily generate insoluble phosphate with calcium ion etc., not only affect the water-soluble of phosphorus, and easily by soil fixing in soil, affect the absorption of plant to phosphorus.
Summary of the invention
The defect of not dissolved salt, easily generation precipitation is there is for current Water soluble fertilizer, the invention provides a kind of Water soluble fertilizer additive, this additive has dissolution effect to the insoluble calcium phosphate in Water soluble fertilizer, magnesium salts, further, the invention provides the preparation method and application of this Water soluble fertilizer additive.This Water soluble fertilizer additive when solid-state and fertilizer can stablize and coexist, after water-soluble can fast electric from, impel insoluble calcium salt, magnesium salts and trace element to dissolve, and continuous chelating, finally make Water soluble fertilizer dissolve completely.
A kind of Water soluble fertilizer additive of the present invention, is characterized in that the weight part of its composition is as follows by dispersion wetting agent coated sulphonyl amino acid subparticle:
Sulphonyl amino acid 85-90 part,
Dispersion wetting agent 5-8 part,
Ammonium polyphosphate 3-5 part,
Ureaphil 1-2 part.
The high ionization of sulphonyl amino acid described above can impel insoluble calcium salt, magnesium salts to ionize;
Dispersion wetting agent described above is at least one in sodium lauryl sulphate, the basic sodium sulfonate of dodecane, tripoly phosphate sodium STPP, derivatived cellulose, polyacrylamide, guar gum, polyvinylpyrrolidone, polyoxyethylene glycol.
The general molecular formula of ammonium polyphosphate described above is (NH
4)
(n+2)p
no
(3n+1), wherein n is 10 ~ 20, can the calcium, magnesium, iron etc. of chelating ionization, can not produce precipitation, the trace element simultaneously in chelate fertilizer.
The preparation method of a kind of Water soluble fertilizer additive of the present invention, is characterized in that preparation method comprises the following steps:
(1) the dispersion wetting agent of 5-8 weight part, the Ureaphil of 1-2 weight part are disperseed by fine machine, obtain coating material;
(2) the sulphonyl amino acid of coating material step (1) obtained, 85-90 weight part mixes and be dried to moisture≤1% under 50 DEG C of condition, adopts shredder to carry out the process of grinding cladding process, is formed by the coated sulphonyl amino acid subparticle of dispersion wetting agent;
(3) the sulphonyl amino acid subparticle coated by dispersion wetting agent obtained of step (2) is mixed with the ammonium polyphosphate of 3-5 weight part in mixing machine, cross 200 mesh sieves and obtain Water soluble fertilizer additive.
In above-mentioned preparation method, fine machine described in step (1) adopts supersonic jet mill, the high-speed jet utilizing supersonic airstream pressed gas to produce makes material mutually collide, rub and obtain micro mist, micro mist is imported into the middle pit of the stomach, collect after discharging with air-flow, coarse fodder continues to pulverize because centrifugal force is thrown to disintegrating area, the final micro mist obtaining particle diameter and be less than 10 μm.For guaranteeing that material is even, fine, jet speed controls at 2-3 Mach.
In above-mentioned preparation method, the shredder described in step (2) adopts ball mill or rod mill.
In above-mentioned preparation method, the mixing machine described in step (3) adopts heating-type mixing, and Heating temperature is 50-60 DEG C, and mixing time is 5-15 minute, will pack in time, prevent the moisture absorption after mixing.
The application of a kind of Water soluble fertilizer additive of the present invention, it is characterized in that being applied to and solubilising is carried out and chelating to the insoluble calcium phosphate in Water soluble fertilizer, magnesium salts and insoluble oxyhydroxide, trace element, especially obvious to the insoluble or microsolubility Phosphate solubilization contained in Water soluble fertilizer.The application of the invention Water soluble fertilizer additive, current fertilizer material purity lower potassium sulfate, ammonium phosphate etc. can be made to possess complete solvability, particularly for the composite fertilizer containing calcium superphosphate, double superhosphate, fused(calcium magnesium)phosphate, reach completely water-soluble requirement by solubilising.
The application of a kind of Water soluble fertilizer additive described above, preferred addition is the 3-10% of Water soluble fertilizer total mass.
Water soluble fertilizer additive of the present invention is by while being converted into dissociated ion by insoluble salt, continuous chelating forms the chelating body with stability, insoluble chemical compound can not be formed again with other material, have fabulous water-soluble, fully can be absorbed by plant, especially to the transhipment of the moderate-elements such as calcium magnesium with absorb very effective.
A kind of Water soluble fertilizer additive of the present invention and its preparation method and application.Water soluble fertilizer additive, primarily of sulphonyl amino acid composition, has stability, can coexist with all kinds of fertilizer, insoluble calcium salt, magnesium salts can be impelled to ionize after water-soluble by its high ionization when solid-state; The calcium, magnesium, iron etc. of further ammonium polyphosphate chelating ionization, can not produce precipitation, and the trace element simultaneously in chelate fertilizer, finally realizes the solubilising of Water soluble fertilizer.Particularly for the composite fertilizer containing microsolubilities such as calcium superphosphate, double superhosphate, fused(calcium magnesium)phosphate, realize dissolving completely by solubilizing agent, significantly widened the range of choice of Water soluble fertilizer to chemical fertilizer raw material, chemical fertilizer raw material can be directly used in Water soluble fertilizer raw material without the need to purifying, and reduces Water soluble fertilizer cost.
A kind of Water soluble fertilizer additive of the present invention and its preparation method and application, compared with prior art outstanding feature and useful effect are:
1, a kind of Water soluble fertilizer additive of the present invention, can coexist with all kinds of chemical fertilizer is stable when solid-state, water-soluble have solubilising and sequestering afterwards to the insoluble calcium phosphate in Water soluble fertilizer, magnesium salts, trace element, to overcome in current Water soluble fertilizer insolubles to the impact of fertigation, fertigation, punching fertilising.
2, a kind of Water soluble fertilizer additive of the present invention, by complete solubilising, improve the application efficiency of available nutrient in fertilizer, significantly widen the selection of Water soluble fertilizer to chemical fertilizer raw material, chemical fertilizer raw material can be directly used in Water soluble fertilizer raw material without the need to purifying, and reduces Water soluble fertilizer cost.
3, a kind of Water soluble fertilizer additive of the present invention is easy to use, can be directly used in the solubilising of the fertilizer containing insoluble calcium phosphate, magnesium salts, insoluble trace element, insoluble phosphoric acid salt etc., have good market using value.
Embodiment
Below by way of embodiment, the present invention is described in further detail, but this should be interpreted as scope of the present invention is only limitted to following example.When not departing from aforesaid method thought of the present invention, the various replacement made according to ordinary skill knowledge and customary means or change, all should be within the scope of the present invention.
embodiment 1
(1) the dispersion wetting agent sodium lauryl sulphate of 5 weight parts, the Ureaphil of 2 weight parts are passed through supersonic jet mill, the high-speed jet utilizing supersonic airstream pressed gas to produce makes material mutually collide, and jet speed controls the coating material obtaining particle diameter be less than 10 μm at 2 Mach;
(2) the sulphonyl amino acid of coating material step (1) obtained, 85 weight parts mixes and be dried to moisture≤1% under 50 DEG C of condition, adopts ball mill to carry out the process of grinding cladding process, is formed by the coated sulphonyl amino acid subparticle of dispersion wetting agent;
(3) the sulphonyl amino acid subparticle coated by dispersion wetting agent obtained of step (2) is mixed in mixing machine with the ammonium polyphosphate of 5 weight parts, Heating temperature is 50-60 DEG C, mixing time is 10 minutes, crosses 200 mesh sieves and obtain Water soluble fertilizer additive after mixing.
Water soluble fertilizer additive embodiment 1 obtained is used for testing the solubilising of compound phosphatic fertilizer:
Compound phosphatic fertilizer forms: primary ammonium phosphate, monocalcium phosphate, calcium superphosphate.
Solubilizing agent consumption 5%.
Detect analytical results as following table 1:
The common compound phosphatic fertilizer of table 1 and the solubility test result of interpolation additive compound phosphatic fertilizer of the present invention in water
| Test event | Common compound phosphatic fertilizer | Add the compound phosphatic fertilizer of 5% additive | Testing method |
| Water-soluble | Water-insoluble 52% | Water-insoluble≤0.2% | NYT 1115-2006 |
| PH value | 6 | 5 | NYT 1115-2006 |
According to test, the additive of the present invention adding 5% can impel the insolubles in compound phosphatic fertilizer to dissolve completely, and its slant acidity value can guarantee that phosphorus is not fixed in soil, promotes that plant is to the absorption of phosphorus.
embodiment 2
(1) the basic sodium sulfonate of dispersion wetting agent dodecane of 5 weight parts, the dispersion wetting agent polyacrylamide of 2 weight parts, the Ureaphil of 2 weight parts are passed through supersonic jet mill, the high-speed jet utilizing supersonic airstream pressed gas to produce makes material mutually collide, and jet speed controls the coating material obtaining particle diameter be less than 10 μm at 2.5 Mach;
(2) the sulphonyl amino acid of coating material step (1) obtained, 90 weight parts mixes and be dried to moisture≤1% under 50 DEG C of condition, adopts rod mill to carry out the process of grinding cladding process, is formed by the coated sulphonyl amino acid subparticle of dispersion wetting agent;
(3) mixed in mixing machine with the ammonium polyphosphate of 3 weight parts by the sulphonyl amino acid subparticle coated by dispersion wetting agent obtained of step (2), Heating temperature is 50-60 DEG C, and mixing time is 5 minutes, crosses 200 mesh sieves and obtain Water soluble fertilizer additive after mixing.
Water soluble fertilizer additive embodiment 2 obtained is used for carrying out solubilising test to potassium sulfate:
Potassium sulfate: fertilizer grade purity 85%.
Solubilizing agent consumption 3%.
Detect analytical results as following table 2:
Table 2 fertilizer grade potassium sulfate and the solubility test result of interpolation additive potassium sulfate of the present invention in water
| Test event | Fertilizer grade potassium sulfate | Add the potassium sulfate of 3% additive | Testing method |
| Water-soluble | Water-insoluble 12% | Water-insoluble≤0.05% | NYT 1115-2006 |
| PH value | 7 | 4 | NYT 1115-2006 |
According to test, the additive of the present invention adding 3% can impel fertilizer grade potassium sulfate to dissolve completely, and it is fixing that its slant acidity value can guarantee that sulfate radical does not solidify with calcium ion in soil, promotes that plant is to the absorption of calcium.
embodiment 3
(1) the dispersion wetting agent Vltra tears of the dispersion wetting agent tripoly phosphate sodium STPP of 3 amount parts, 3 weight parts, the Ureaphil of 1 weight part are passed through supersonic jet mill, the high-speed jet utilizing supersonic airstream pressed gas to produce makes material mutually collide, and jet speed controls the coating material obtaining particle diameter be less than 10 μm at 2 Mach;
(2) the sulphonyl amino acid of coating material step (1) obtained, 86 weight parts mixes and be dried to moisture≤1% under 50 DEG C of condition, adopts rod mill to carry out the process of grinding cladding process, is formed by the coated sulphonyl amino acid subparticle of dispersion wetting agent;
(3) the sulphonyl amino acid subparticle coated by dispersion wetting agent obtained of step (2) is mixed in mixing machine with the ammonium polyphosphate of 4 weight parts, Heating temperature is 50-60 DEG C, mixing time is 15 minutes, crosses 200 mesh sieves and obtain Water soluble fertilizer additive after mixing.
embodiment 4
(1) the dispersion wetting agent polyvinylpyrrolidone of the dispersion wetting agent guar gum of 4 amount parts, 2 weight parts, the Ureaphil of 2 weight parts are passed through supersonic jet mill, the high-speed jet utilizing supersonic airstream pressed gas to produce makes material mutually collide, and jet speed controls the coating material obtaining particle diameter be less than 10 μm at 3 Mach;
(2) the sulphonyl amino acid of coating material step (1) obtained, 85 weight parts mixes and be dried to moisture≤1% under 50 DEG C of condition, adopts ball mill to carry out the process of grinding cladding process, is formed by the coated sulphonyl amino acid subparticle of dispersion wetting agent;
(3) the sulphonyl amino acid subparticle coated by dispersion wetting agent obtained of step (2) is mixed in mixing machine with the ammonium polyphosphate of 5 weight parts, Heating temperature is 50-60 DEG C, mixing time is 12 minutes, crosses 200 mesh sieves and obtain Water soluble fertilizer additive after mixing.
embodiment 5
(1) the dispersion wetting agent PVOH of the dispersion wetting agent guar gum of 6 amount parts, 1 weight part, the Ureaphil of 1.5 weight parts are passed through supersonic jet mill, the high-speed jet utilizing supersonic airstream pressed gas to produce makes material mutually collide, and jet speed controls the coating material obtaining particle diameter be less than 10 μm at 2 Mach;
(2) the sulphonyl amino acid of coating material step (1) obtained, 88 weight parts mixes and be dried to moisture≤1% under 50 DEG C of condition, adopts ball mill to carry out the process of grinding cladding process, is formed by the coated sulphonyl amino acid subparticle of dispersion wetting agent;
(3) the sulphonyl amino acid subparticle coated by dispersion wetting agent obtained of step (2) is mixed in mixing machine with the ammonium polyphosphate of 3.5 weight parts, Heating temperature is 50-60 DEG C, mixing time is 10 minutes, crosses 200 mesh sieves and obtain Water soluble fertilizer additive after mixing.
Claims (7)
1. a Water soluble fertilizer additive, is characterized in that: the sulphonyl amino acid subparticle coated by dispersion wetting agent, and the weight part of its composition is as follows:
Sulphonyl amino acid 85-90 part,
Dispersion wetting agent 5-8 part,
Ammonium polyphosphate 3-5 part,
Ureaphil 1-2 part,
The high ionization of wherein said sulphonyl amino acid can impel insoluble calcium salt, magnesium salts to ionize; Described dispersion wetting agent is at least one in sodium lauryl sulphate, Sodium dodecylbenzene sulfonate, tripoly phosphate sodium STPP, derivatived cellulose, polyacrylamide, guar gum, polyvinylpyrrolidone, polyoxyethylene glycol; The general molecular formula of described ammonium polyphosphate is (NH
4)
(n+2)p
no
(3n+1), wherein n is 10 ~ 20, can chelating ionization calcium, magnesium, iron, can not precipitation be produced.
2. a preparation method for Water soluble fertilizer additive described in claim 1, is characterized in that comprising the following steps:
(1) the dispersion wetting agent of 5-8 weight part, the Ureaphil of 1-2 weight part are disperseed by fine machine, obtain coating material;
(2) the sulphonyl amino acid of coating material step (1) obtained, 85-90 weight part mixes and be dried to moisture≤1% under 50 DEG C of condition, adopts shredder to carry out the process of grinding cladding process, is formed by the coated sulphonyl amino acid subparticle of dispersion wetting agent;
(3) the sulphonyl amino acid subparticle coated by dispersion wetting agent step (2) obtained mixes in mixing machine with the ammonium polyphosphate of 3-5 weight part, crosses 200 mesh sieves and obtains Water soluble fertilizer additive.
3. the preparation method of Water soluble fertilizer additive according to claim 2, it is characterized in that: the fine machine described in step (1) adopts supersonic jet mill, the high-speed jet utilizing supersonic airstream pressed gas to produce makes material mutually collide, rub and obtain micro mist, jet speed controls at 2-3 Mach, and grain size of micropowder is less than 10 μm.
4. the preparation method of Water soluble fertilizer additive according to claim 2, is characterized in that: the shredder described in step (2) adopts ball mill or rod mill.
5. the preparation method of Water soluble fertilizer additive according to claim 2, is characterized in that: the mixing machine described in step (3) adopts heating-type mixing, and Heating temperature is 50-60 DEG C, and mixing time is 5-15 minute.
6. the application of a kind of Water soluble fertilizer additive according to claim 1, is characterized in that: be applied to and carry out solubilising and chelating to the insoluble calcium phosphate in Water soluble fertilizer, magnesium salts and insoluble oxyhydroxide.
7. the application of a kind of Water soluble fertilizer additive according to claim 1, is characterized in that: the addition of Water soluble fertilizer additive in Water soluble fertilizer is the 3-10% of Water soluble fertilizer total mass.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104628477A (en) * | 2015-02-06 | 2015-05-20 | 湖北三得利肥业有限公司 | Instant less-residue compound fertilizer and preparation method thereof |
| CN105622258A (en) * | 2015-12-25 | 2016-06-01 | 成都新柯力化工科技有限公司 | Water-soluble fertilizer dedicated for tulip and preparation method thereof |
| CN105503427A (en) * | 2015-12-31 | 2016-04-20 | 王丰登 | Preparation method of urea-phosphate-containing multielement water-soluble fertilizer |
| CN106631578A (en) * | 2016-12-08 | 2017-05-10 | 深圳市芭田生态工程股份有限公司 | Humic acid composite fertilizer and preparation method thereof |
| CN106977282A (en) * | 2017-04-06 | 2017-07-25 | 安徽康坶国际化肥股份有限公司 | A kind of insect pest a great number of elements water-soluble fertilizer |
| CN108409394A (en) * | 2018-04-27 | 2018-08-17 | 武汉工程大学 | Complete water-soluble monoammonium phosphate or diammonium phosphate fertilizer and its preparation |
| EP4149911A1 (en) * | 2020-05-13 | 2023-03-22 | Lima Europe | Water-soluble fertilizer |
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|---|---|---|---|---|
| US5997602A (en) * | 1995-06-22 | 1999-12-07 | Kemira Agro Oy | Aqueous fertilzer suspension containing at least phosphate ions and calcium or magnesium ions and a use of the suspension |
| CN101333133A (en) * | 2008-08-04 | 2008-12-31 | 陈兆喜 | High concentration compound fertilizer for drip irrigation |
| CN103664359A (en) * | 2013-11-25 | 2014-03-26 | 华南农业大学 | High-phosphorus high-zinc liquid compound fertilizer and preparation method thereof |
-
2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997602A (en) * | 1995-06-22 | 1999-12-07 | Kemira Agro Oy | Aqueous fertilzer suspension containing at least phosphate ions and calcium or magnesium ions and a use of the suspension |
| CN101333133A (en) * | 2008-08-04 | 2008-12-31 | 陈兆喜 | High concentration compound fertilizer for drip irrigation |
| CN103664359A (en) * | 2013-11-25 | 2014-03-26 | 华南农业大学 | High-phosphorus high-zinc liquid compound fertilizer and preparation method thereof |
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