CN106588508B - Special fertilizer for preventing and treating clubroot of cruciferous crops as well as preparation method and application thereof - Google Patents
Special fertilizer for preventing and treating clubroot of cruciferous crops as well as preparation method and application thereof Download PDFInfo
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- CN106588508B CN106588508B CN201611248355.8A CN201611248355A CN106588508B CN 106588508 B CN106588508 B CN 106588508B CN 201611248355 A CN201611248355 A CN 201611248355A CN 106588508 B CN106588508 B CN 106588508B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
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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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- 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
- C05G3/80—Soil conditioners
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Abstract
The invention provides a special fertilizer for preventing and treating clubroot of cruciferous crops and a preparation method thereof, wherein the special fertilizer is prepared from the following raw materials in parts by weight: 15-20 parts of urea, 13-14 parts of water-soluble calcium, 5-8 parts of magnesium salt, 12-16 parts of potassium chloride, 1-3 parts of lime nitrogen, 4-6 parts of borax, 0.1-0.5 part of zhongshengmycin, 0.8-1.2 parts of hydroxypropyl methyl cellulose and 0.5-0.8 part of sepiolite. The special fertilizer disclosed by the invention is rich in nutrient components, can promote the growth of crops, is rich in two strong bactericidal substances, can play a synergistic effect, has a good effect of preventing and treating the clubroot of the crops after being spread in the field, greatly reduces the incidence rate of clubroot germs, reduces the disease index of the clubroot germs, and remarkably improves the yield of the crops.
Description
Technical Field
The invention belongs to the technical field of crop fertilizers, and particularly relates to a special fertilizer for preventing and treating clubroot of cruciferous crops, and a preparation method and application thereof.
Background
Cruciferae crops are important oil and economic crops in China, but the Cruciferae crops are very easy to be infected with clubroot to cause crop yield reduction or outcrop harvest, and the production life and economic benefit of farmers are seriously influenced. The clubroot is a ubiquitous soil-borne disease, the pathogeny of the clubroot is plasmodiophora brassicae, the plasmodiophora brassicae is a low-grade fungus, the pathogen survives in the soil along with the remains of disease bodies through winter in a dormant sporangium manner, and the vitality of the pathogen can be kept for more than 10 years. The plasmodiophora root belongs to obligate parasitic bacteria, has strong infectivity, high propagation speed, multiple paths and great control difficulty, and the spores of the plasmodiophora root can be propagated in fields along with disease residues, seeds (seedlings), irrigation water, insects, compost, farm implements and farm work activities. After the disease occurs, the roots and stems of the crops are hindered from absorbing and conducting nutrients, the crops are poor in growth, wilted and dwarfed, and the yield and the quality are damaged, so that the yield is greatly reduced and even the crops are completely harvested, and economic loss is caused.
At present, no specific control means is available for clubroot. The main control measures are: agricultural measures, chemical prevention and cure, disease-resistant variety breeding and biological prevention and cure.
Firstly, agricultural measures are as follows: (1) improving the pH value of soil; (2) performing paddy-upland field crop rotation for more than 5 years or crop rotation with non-cruciferous crops; (3) removing and destroying the diseased plant in time; (4) seedling and transplanting in disease-free soil, seedling in disease-free fields, and transplanting with soil in 6-8 leaf periods; (5) strengthening cultivation management, reasonably close planting, selecting field planting in sunny days, insisting on deep ditches and high compartments, and timely draining field accumulated water.
II, chemical prevention and control: (1) seed treatment and seedbed and farm tool disinfection; (2) the prevention and treatment are carried out by chemical medicaments such as fluazinam (Fridade), cyazofamid (Kejia), chlorothalonil, thiophanate methyl and the like.
Thirdly, breeding disease-resistant varieties: breeding high disease-resistant varieties through disease-resistant genetic research;
fourthly, biological control: plasmodiophora bacteria in soil are inhibited or killed by isolating antagonistic microorganisms from nature or developing biological agents.
Although the control method can achieve the aim of controlling clubroot to a certain extent, the control method has the advantages of long control time, inconvenient operation and poor effect, and at present, no special fertilizer for controlling clubroot of cruciferous crops exists, and the control problem of clubroot can be effectively solved.
Disclosure of Invention
The invention aims to solve the technical problems and provides the special fertilizer for preventing and treating the clubroot of the cruciferous crops.
The invention aims to provide a special fertilizer for preventing and treating clubroot of cruciferous crops, which adopts the following technical scheme:
a special fertilizer for preventing and treating clubroot of cruciferous crops is prepared from the following raw materials in parts by weight: 15-20 parts of urea, 13-14 parts of water-soluble calcium, 5-8 parts of magnesium salt, 12-16 parts of potassium chloride, 1-3 parts of lime nitrogen, 4-6 parts of borax, 0.1-0.5 part of zhongshengmycin, 0.8-1.2 parts of hydroxypropyl methyl cellulose and 0.5-0.8 part of sepiolite.
By adopting the formula, the special fertilizer has a good compounding effect, can provide rich nutrient substances for plant growth, is rich in nutrient elements such as N, K, Ca, Mg, B and the like, and can increase the yield of crops; but also can effectively inhibit the infection and sterilization of plasmodiophora brassicae, and greatly reduces the incidence rate of plasmodiophora brassicae.
The application of the boron fertilizer not only has positive effect on the growth of cruciferous crops, but also can inhibit the development of pathogenic bacteria from protoplasm groups to sporangiums in the root hair infection stage and reduce the severity of clubroot. Lime nitrogen in the special fertilizer is an effective bactericide, and mainly comprises calcium cyanamide and calcium oxide, free basic calcium salts such as cyanamide, calcium carbonate and calcium hydroxide can be generated after hydrolysis in soil, the effect of adjusting the pH value of the soil can be achieved, the acid environment of the soil can be improved, the germination of pathogen spores at the rhizosphere of crops can be inhibited, and the free cyanamide can kill plasmodiophora pathogenic microorganisms in the soil, so that the occurrence of plasmodiophora can be reduced.
The zhongshengmycin in the special fertilizer is an agricultural antibiotic, has very strong bactericidal effect, can inhibit the synthesis of protein in bacteria, and leads to the death of thalli; the filamentous hyphae of the fungus can be deformed, so that the spore germination is inhibited, and the spores are directly killed; however, the compound fertilizer cannot be mixed with alkaline pesticides, and if the compound fertilizer is mixed with lime nitrogen, the pesticide effect is greatly reduced, and the effect of preventing and treating clubroot cannot be achieved, so that the addition of hydroxypropyl methyl cellulose and sepiolite into the special fertilizer is very necessary. The hydroxypropyl methyl cellulose (HPMC) is non-ionic cellulose ether which is prepared by taking cellulose as a natural high molecular material through a series of chemical processing, is odorless, tasteless and nontoxic white powder, can be dissolved in cold water to form a transparent viscous solution, and has the characteristics of thickening capacity, low ash content in salt discharge, pH stability, water retention property, size stability, adsorbability, excellent film forming property, wide enzyme resistance, dispersibility, cohesiveness and the like. The invention utilizes the adsorbability and excellent film forming property of the hydroxypropyl methyl cellulose to form a layer of compact protective film outside the zhongshengmycin to prevent the protective film from contacting with the lime nitrogen, thereby fully playing the bacteriostatic action of the two and improving the fertilizer efficiency. Sepiolite as a clay mineral has the characteristics of large specific surface area and strong adsorbability after absorbing water in soil, can effectively adsorb nutrient substances and sterilizing substances in the fertilizer, enables zhongshengmycin to stably exist with lime nitrogen of an alkaline fertilizer under the action of a protective film formed by hydroxypropyl methyl cellulose, thereby playing the effect of compounding the lime nitrogen and the zhongshengmycin, playing the role of synergy after compounding the lime nitrogen and the zhongshengmycin, and greatly reducing the incidence rate of clubroot.
Preferably, the raw material consists of the following components: 16 parts of urea, 13 parts of water-soluble calcium, 7 parts of magnesium salt, 12 parts of potassium chloride, 2 parts of lime nitrogen, 5 parts of granular boron, 0.3 part of zhongshengmycin, 0.9 part of hydroxypropyl methyl cellulose and 0.6 part of sepiolite; the special fertilizer prepared according to the proportion has the best effect of preventing and treating clubroot.
Preferably, the water-soluble calcium comprises CaCl2And/or Ca (NO)3)2。
Preferably, the magnesium salt comprises MgSO4And/or MgCl2。
Preferably, the particle size of the sepiolite is 1.5-2.0 mm, and under the particle size, the specific surface area of the sepiolite is large, so that the sepiolite can adsorb rich nutrient substances, and can fully exert the bacteriostatic and bactericidal effects of the fertilizer.
The second purpose of the invention is to provide a preparation method of the special fertilizer, which comprises the following steps:
(1) weighing 0.5-0.8 part of sepiolite according to parts by weight, crushing to the particle size of 1.5-2.0 mm, adding 0.8-1.2 parts of hydroxypropyl methyl cellulose and 0.1-0.5 part of zhongshengmycin, adding water, uniformly mixing, and standing for 5min after a layer of protective film is formed on the surface of the mixture;
(2) weighing 15-20 parts of urea, 13-14 parts of water-soluble calcium, 5-8 parts of magnesium salt, 12-16 parts of potassium chloride, 1-3 parts of lime nitrogen and 4-6 parts of borax according to parts by weight, and uniformly mixing;
(3) adding the product obtained in the step (2) into the product obtained in the step (1), adding water, mixing, stirring uniformly in a stirrer, granulating by using a fertilizer granulator, drying and packaging.
In the preparation method of the special fertilizer, firstly, uniformly mixing the hydroxypropyl methyl cellulose and the zhongshengmycin to form a layer of compact protective film on the surface of the zhongshengmycin, and then fully fixing the zhongshengmycin under the adsorption action of the sepiolite particles; after the adsorbed and fixed zhongshengmycin and the alkaline component lime nitrogen in the fertilizer are mixed, a layer of protective film exists, so that a good synergistic sterilization effect can be achieved, the germination of plasmodiophora brassicae spores is inhibited, the spores are killed to a certain extent, and sufficient nutrient substances are added, so that the effective number of the spores in soil is finally reduced, and the incidence rate of the plasmodiophora brassicae is greatly reduced.
The third purpose of the invention is to provide the application of the special fertilizer in the prevention and treatment of clubroot of cruciferous crops, the special fertilizer can be applied by spreading a turnover cover in soil before the cruciferous crops are planted or spreading the fertilizer at the roots of the cruciferous crops in the growth period of the cruciferous crops, and the fertilizer is applied by 25-30 kg per mu, so that the effect of well preventing and treating the clubroot can be achieved.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a special fertilizer for preventing and treating clubroot of cruciferous crops, which is rich in nutrient components, and after two mutually influenced bactericidal substances are effectively mixed, a protective film is formed between the two mutually influenced bactericidal substances, so that the synergistic effect is achieved, the effect of preventing and treating the clubroot is good, the incidence rate of clubroot germs is greatly reduced, and the yield of crops is remarkably improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following embodiments, and it should be noted that the following embodiments are only for explaining and illustrating the present invention and are not intended to limit the present invention. The invention is not limited to the embodiments described above, but rather, may be modified within the scope of the invention.
Example 1
A special fertilizer for preventing and treating clubroot of cruciferous crops comprises the following raw materials in parts by weight: 15 parts of urea, 13 parts of calcium chloride, 5 parts of magnesium chloride, 12 parts of potassium chloride, 1 part of lime nitrogen, 4 parts of borax, 0.1 part of zhongshengmycin, 0.8 part of hydroxypropyl methyl cellulose and 0.5 part of sepiolite; the preparation method comprises the following steps:
(1) weighing 0.5 part of sepiolite according to parts by weight, crushing the sepiolite into particles with the particle size of 1.5mm, adding 0.8 part of hydroxypropyl methylcellulose and 0.1 part of zhongshengmycin into the sepiolite, adding water into the sepiolite and the zhongshengmycin, uniformly mixing the sepiolite and the zhongshengmycin until a layer of protective film is formed on the surface of the mixture, and standing the mixture for 5 min;
(2) weighing 15 parts of urea, 13 parts of calcium chloride, 5 parts of magnesium chloride, 12 parts of potassium chloride, 1 part of lime nitrogen and 4 parts of borax according to the parts by weight, and uniformly mixing;
(3) and (3) adding the obtained product in the step (2) into the obtained product in the step (1), adding water, mixing uniformly in a stirrer, granulating by using a fertilizer granulator, drying, and subpackaging to obtain the special fertilizer for preventing and treating clubroot of cruciferous crops.
Example 2
A special fertilizer for preventing and treating clubroot of cruciferous crops comprises the following raw materials in parts by weight: 16 parts of urea, 13 parts of calcium chloride, 7 parts of magnesium chloride, 12 parts of potassium chloride, 2 parts of lime nitrogen, 5 parts of borax, 0.3 part of zhongshengmycin, 0.9 part of hydroxypropyl methyl cellulose and 0.6 part of sepiolite; the preparation method comprises the following steps:
(1) weighing 0.6 part of sepiolite according to parts by weight, crushing the sepiolite into particles with the particle size of 1.8mm, adding 0.9 part of hydroxypropyl methylcellulose and 0.3 part of zhongshengmycin into the sepiolite, adding water into the sepiolite and the zhongshengmycin, uniformly mixing the sepiolite and the zhongshengmycin until a layer of protective film is formed on the surface of the mixture, and standing the mixture for 5 min;
(2) weighing 16 parts of urea, 13 parts of calcium chloride, 6 parts of magnesium chloride, 15 parts of potassium chloride, 2 parts of lime nitrogen and 5 parts of borax according to the parts by weight, and uniformly mixing;
(3) and (3) adding the obtained product in the step (2) into the obtained product in the step (1), adding water, mixing uniformly in a stirrer, granulating by using a fertilizer granulator, drying, and subpackaging to obtain the special fertilizer for preventing and treating clubroot of cruciferous crops.
Example 3
A special fertilizer for preventing and treating clubroot of cruciferous crops comprises the following raw materials in parts by weight: 20 parts of urea, 14 parts of calcium nitrate, 8 parts of magnesium chloride, 16 parts of potassium chloride, 3 parts of lime nitrogen, 6 parts of borax, 0.5 part of zhongshengmycin, 1.2 parts of hydroxypropyl methyl cellulose and 0.8 part of sepiolite; the preparation method comprises the following steps:
(1) weighing 0.8 part of sepiolite according to parts by weight, crushing the sepiolite into particles with the particle size of 2.0mm, adding 1.2 parts of hydroxypropyl methylcellulose and 0.5 part of zhongshengmycin into the sepiolite, adding water into the sepiolite and the zhongshengmycin, uniformly mixing the sepiolite and the zhongshengmycin until a layer of protective film is formed on the surface of the mixture, and standing the mixture for 5 min;
(2) weighing 20 parts of urea, 14 parts of calcium nitrate, 8 parts of magnesium chloride, 16 parts of potassium chloride, 3 parts of lime nitrogen and 6 parts of borax in parts by weight, and uniformly mixing;
(3) and (3) adding the obtained product in the step (2) into the obtained product in the step (1), adding water, mixing uniformly in a stirrer, granulating by using a fertilizer granulator, drying, and subpackaging to obtain the special fertilizer for preventing and treating clubroot of cruciferous crops.
Example 4
A special fertilizer for preventing and treating clubroot of cruciferous crops comprises the following raw materials in parts by weight: 19 parts of urea, 8 parts of calcium chloride, 6 parts of calcium nitrate, 5 parts of magnesium chloride, 3 parts of magnesium sulfate, 15 parts of potassium chloride, 3 parts of lime nitrogen, 5 parts of borax, 0.4 part of zhongshengmycin, 1.0 part of hydroxypropyl methyl cellulose and 0.7 part of sepiolite; the preparation method comprises the following steps:
(1) weighing 0.7 part of sepiolite according to parts by weight, crushing the sepiolite into particles with the particle size of 1.9mm, adding 1.0 part of hydroxypropyl methylcellulose and 0.4 part of zhongshengmycin into the sepiolite, adding water into the sepiolite and the zhongshengmycin, uniformly mixing the sepiolite and the zhongshengmycin until a layer of protective film is formed on the surface of the mixture, and standing the mixture for 5 min;
(2) weighing 19 parts of urea, 8 parts of calcium chloride, 6 parts of calcium nitrate, 5 parts of magnesium chloride, 3 parts of magnesium sulfate, 15 parts of potassium chloride, 3 parts of lime nitrogen and 5 parts of borax according to the parts by weight, and uniformly mixing;
(3) and (3) adding the obtained product in the step (2) into the obtained product in the step (1), adding water, mixing uniformly in a stirrer, granulating by using a fertilizer granulator, drying, and subpackaging to obtain the special fertilizer for preventing and treating clubroot of cruciferous crops.
Comparative example 1
A specialty fertilizer was prepared as in example 1, except that sepiolite was not added, and the remaining ingredients were identical to those of example 1.
Comparative example 2
A special fertilizer was prepared according to the method of example 2, except that no zhongshengmycin was added, and the remaining components were identical to those of example 2.
Comparative example 3
A specialty fertilizer was prepared as in example 3, except that hydroxypropyl methylcellulose was not added, and the remaining ingredients were identical to example 3.
Comparative example 4
A specialty fertilizer was prepared as in example 4, except that no lime nitrogen and hydroxypropyl methylcellulose were added, and the remaining ingredients were identical to example 4.
Application example 1
The special fertilizer obtained in the above examples 1-4 and comparative examples 1-4 was used for controlling clubroot of cabbage, in a plot where clubroot of cabbage occurs seriously in a certain place in the wenjiang city (incidence of cabbage is 83%, disease index is 61.5), the fertilizer was applied by spreading a turning cover in soil 5 days before planting of cabbage, 30 kg per mu was applied, after the cabbage was ripe, the seedling rate, disease index and yield of cabbage in the field were counted, and the obtained results are shown in table 1.
TABLE 1
As can be seen from Table 1, the special fertilizer disclosed by the invention has a good effect of preventing and treating clubroot disease of the Chinese cabbage, the disease rate of the Chinese cabbage is below 5%, the disease index is below 13.0, and the Chinese cabbage yield per mu is increased by more than 40% compared with the planting method of the comparative example.
Application example 2
The special fertilizer obtained in the above examples 1-4 and comparative examples 1-4 is used for preventing and treating rape clubroot, in a plot where rape clubroot is more serious (rape incidence rate is 87.3%, disease index is 65.2) in a certain place in Guanghan city, the fertilizer is spread on roots after 3 main leaves of rape grow out, 35 kg is applied per mu, and after rape is mature, the seedling rate of rape in field, the seedling rate of rape and the seedling rate of rape in field are counted,
The disease rate, disease index and yield were as shown in Table 2.
TABLE 2
As can be seen from Table 2, the special fertilizer provided by the invention has a good prevention and treatment effect on rape clubroot, the rape plant rate is below 4%, the disease index is about 10.4, and the increase of rape acre is more than 45% compared with the comparative example.
Application example 3
The special fertilizer obtained in the above examples 1 to 4 and comparative examples 1 to 4 was used for controlling clubroot of cabbage in a plot where clubroot of cabbage occurred more seriously in de yang city (incidence rate of cabbage 81.6%, disease index 59.7), the fertilizer was applied to roots after 5 true leaves of cabbage were grown, 25 kg was applied per mu, and after the cabbage was ripe, the seedling rate, disease incidence, disease index and yield of cabbage in the field were counted, and the results are shown in table 3.
TABLE 3
As can be seen from Table 3, the special fertilizer provided by the invention has a good effect of preventing and treating clubroot of cabbage, the disease rate of cabbage plants is below 8%, the disease index is about 15.0, and the yield of cabbage mu is increased by more than 60%.
Claims (9)
1. The special fertilizer for preventing and treating clubroot of cruciferous crops is characterized by comprising the following raw materials in parts by weight: 15-20 parts of urea, 13-14 parts of water-soluble calcium, 5-8 parts of magnesium salt, 12-16 parts of potassium chloride, 1-3 parts of lime nitrogen, 4-6 parts of borax, 0.1-0.5 part of zhongshengmycin, 0.8-1.2 parts of hydroxypropyl methyl cellulose and 0.5-0.8 part of sepiolite;
the preparation method of the special fertilizer comprises the following steps:
(1) weighing 0.5-0.8 part of sepiolite according to parts by weight, crushing to the particle size of 1.5-2.0 mm, adding 0.8-1.2 parts of hydroxypropyl methyl cellulose and 0.1-0.5 part of zhongshengmycin, adding water, uniformly mixing, and standing for 5min after a layer of protective film is formed on the surface of the mixture;
(2) weighing 15-20 parts of urea, 13-14 parts of water-soluble calcium, 5-8 parts of magnesium salt, 12-16 parts of potassium chloride, 1-3 parts of lime nitrogen and 4-6 parts of borax according to parts by weight, and uniformly mixing;
(3) adding the product obtained in the step (2) into the product obtained in the step (1), adding water, mixing, stirring uniformly in a stirrer, granulating by using a fertilizer granulator, drying and packaging.
2. The special fertilizer for preventing and treating clubroot of cruciferous crops as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 16 parts of urea, 13 parts of water-soluble calcium, 7 parts of magnesium salt, 12 parts of potassium chloride, 2 parts of lime nitrogen, 5 parts of borax, 0.3 part of zhongshengmycin, 0.9 part of hydroxypropyl methyl cellulose and 0.6 part of sepiolite.
3. The special fertilizer for controlling clubroot of cruciferous crops as claimed in claim 1 or 2, wherein the water-soluble calcium comprises CaCl2And/or Ca (NO)3)2。
4. The special fertilizer for controlling clubroot of cruciferous crops as claimed in claim 1 or 2, wherein the magnesium salt comprises MgSO4And/or MgCl2。
5. A preparation method of a special fertilizer for preventing and treating clubroot of cruciferous crops is characterized by comprising the following steps:
(1) weighing 0.5-0.8 part of sepiolite according to parts by weight, crushing to the particle size of 1.5-2.0 mm, adding 0.8-1.2 parts of hydroxypropyl methyl cellulose and 0.1-0.5 part of zhongshengmycin, adding water, uniformly mixing, and standing for 5min after a layer of protective film is formed on the surface of the mixture;
(2) weighing 15-20 parts of urea, 13-14 parts of water-soluble calcium, 5-8 parts of magnesium salt, 12-16 parts of potassium chloride, 1-3 parts of lime nitrogen and 4-6 parts of borax according to parts by weight, and uniformly mixing;
(3) adding the product obtained in the step (2) into the product obtained in the step (1), adding water, mixing, stirring uniformly in a stirrer, granulating by using a fertilizer granulator, drying and packaging.
6. The method of claim 5, wherein the water-soluble calcium comprises CaCl2And/or Ca (NO)3)2。
7. The method of claim 5, wherein the magnesium salt comprises MgSO4And/or MgCl2。
8. The application of the special fertilizer as claimed in claim 1 or 2 or the special fertilizer prepared by the method as claimed in any one of claims 5 to 7 in controlling clubroot of cruciferous crops.
9. The application of claim 8, wherein the turnover cover is applied to the soil before the cruciferous crops are planted or the cover is applied to the roots of the cruciferous crops in the growth period, and the quantity of the turnover cover per mu is 25-35 kg.
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