CN105384519A - Sulfur-coated slow-release selenium-rich fertilizer and preparation method thereof - Google Patents
Sulfur-coated slow-release selenium-rich fertilizer and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a sulfur-coated slow-release selenium-rich fertilizer and a preparation method thereof. The sulfur-coated slow-release selenium-rich fertilizer comprises the following components in parts by weight: 10-20 parts of urea, 20-40 parts of ammonium chloride, 10-20 parts of monoammonium phosphate, 15-30 parts of potassium nitrate, 0.5-1.0 part of sodium selenite, 20-40 parts of humic acid, 4-8 parts of natural polysaccharide nano-microspheres, 1-3 parts of sulfur, 0.1-1 part of a sealant and 0.5-1.5 parts of a microbial additive. The preparation method comprises the steps of spraying fused sulfur to a surface layer of a selenium-rich fertilizer by virtue of a roller so as to obtain a sulfur layer with uniform and fixed thickness, and carrying out air cooling on coated particles in a stepped air cooling manner, so as to obtain the sulfur-coated slow-release selenium-rich fertilizer. According to the sulfur-coated slow-release selenium-rich fertilizer, slow-release and controlled release effects can be reached and a certain preventive effect to diseases and pests is achieved; and the fertilizer is rich in selenium, so that the organic selenium content of plants is effectively increased, and the crop yield is increased.
Description
Technical field
The invention belongs to technical field of fertilizers, be specifically related to a kind of sulphur coating type slowly-releasing selenium-enriched fertilizer and preparation method thereof.
Background technology
China is chemical fertilizer consumption big country, year total quantity consumed reach more than 4,100 ten thousand tons.Selenium is one of essential trace element of humans and animals, human or animal lacks or the selenium of excess intake, then can cause some disease, the sickness rate such as Keshan disease, Kaschin-Beck disease, myocardosis, cancer as scarce selenium area is very high, the disease that selenium significantly can reduce the multiple cancers such as mammary cancer, skin carcinoma, colorectal carcinoma, liver cancer sends out rate, and selenium plays inherent keying action to HUMAN HEALTH, strengthens the exploitation of rich selenium food, there is important business & economy be worth, more can strengthen the physique of the people.Tradition selenium sources mainly inorganic selenium and mineral selenium, inorganic selenium toxicity is comparatively large, relatively more serious to plant injury, and mineral selenium content is unstable, and plant absorption efficiency is not high, easily pollutes soil.After medium-sized particle selenium-enriched fertilizer is manured into soil, nutrient releasing speed is fast, and early stage is too high, the later stage is too low, is unfavorable for that crop equilibrium absorbs, causes utilization rate of fertilizer low; Coated fertilizer is divided into inorganics coated fertilizer, organism coated fertilizer and degradable thing coated fertilizer according to coating material difference.But at present, dressing is many to be used in urea, is not utilized effectively in selenium-enriched fertilizer field.
Summary of the invention
The object of the present invention is to provide a kind of slow controlled capability good, long-acting releasing nutrients element, utilization rate of fertilizer is high, is rich in selenium, significantly can improve the sulphur coating type slowly-releasing selenium-enriched fertilizer of crop yield and quality.
The present invention also aims to provide the preparation method of above-mentioned sulphur coating type slowly-releasing selenium-enriched fertilizer.
A kind of sulphur coating type slowly-releasing selenium-enriched fertilizer, be made up of the component of following parts by weight: urea 10-20 part, ammonium chloride 20-40 part, ammonium hydrogen phosphate 10-20 part, saltpetre 15-30 part, Sodium Selenite 0.5-1.0 part, humic acids 20-40 part, Nano microsphere 4-8 part of natural polysaccharide, coating agent 1-3 part, sealing agent 0.1-1 part, microbe additive 0.5-1.5 part.
Described natural polysaccharide is oligochitosan, starch, xylo-oligosaccharide, raffinose, stachyose, one or more in Rhizoma amorphophalli powder.
Described coating agent is sulphur.
Described sealing agent is polyethylene wax, polystyrene, polyvinyl chloride, polyvinyl alcohol, hydroxyethyl first propylene, Mierocrystalline cellulose, one or more in xylogen.
Described microbe additive is milk-acid bacteria, yeast, genus bacillus, phosphate solubilizing bacteria, potassium solubilizing bacteria, one or more in vinelandii.
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) urea 10-20 part is got by weight, ammonium chloride 20-40 part, ammonium hydrogen phosphate 10-20 part, saltpetre 15-30 part, Sodium Selenite 0.5-1.0 part, humic acids 20-40 part, Nano microsphere 4-8 part of natural polysaccharide, sulphur 1-3 part, sealing agent 0.1-1 part, microbe additive 0.5-1.5 part is for subsequent use;
(2) 0.5-1.0 part Sodium Selenite is dissolved in 3-30 part water, adds natural polysaccharide Nano microsphere 4-8 part as template, stir 2-6 hour at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 10-20 part urea, 20-40 part ammonium chloride, ammonium hydrogen phosphate 10-20 part, saltpetre 15-30 part, humic acids 20-40 part, microbe additive 0.5-1.5 part fully mixes, and stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 2-4mm;
(4) heat 1-3 part sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.4-0.8MPa pressure, coating thickness is 30-100 μm;
(5) by the melting of sealing agent 0.1-1 part, the material after surface spraying utilizes volume pump to seal under 0.3-0.45MPa pressure, seal thickness 20-80 μm; After sealing, material adopts air cooling way with 8000-9000m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
Beneficial effect of the present invention: sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present invention, slow controlled capability is good, long-acting releasing nutrients element, utilization rate of fertilizer is high, is conducive to Crop, utilization and enrichment, the loss of fertilizer nutrient in soil can be reduced, reduce fertile industry operations number, save labour and expense, reduce the excessive pollution of using chemical fertilizer and causing, improve utilization rate of fertilizer, certain preventive and therapeutic effect can also be had to sick worm; Interpolation selenium is micronutrient element, effectively increases the organic Se-rich amount of plant, can significantly improve crop yield and quality, improves crop yield, and the agricultural-food produced are in anti-cancer, anticancer, and the aspects such as prevention and therapy cardiovascular disorder have certain effect.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
Embodiment 1
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) get 10 parts, urea by weight, ammonium chloride 20 parts, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, Sodium Selenite 0.6 part, humic acids 20 parts, the Nano microsphere of oligochitosan 5 parts, 2 parts, sulphur, polyethylene wax 0.5 part, lactic bacteria additive 0.5 part is for subsequent use;
(2) 0.6 part of Sodium Selenite is dissolved in 12 parts of water, adds the Nano microsphere 5 parts of oligochitosan as template, stir 4 hours at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 10 parts of urea, 20 parts of ammonium chlorides, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, humic acids 20 parts, lactic bacteria additive 0.5 part is mixing fully, stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 3mm;
(4) heat 2 parts of sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.6MPa pressure, coating thickness is 60 μm;
(5) by polyethylene wax 0.5 part of melting as sealing agent, the material after surface spraying utilizes volume pump to seal under 0.35MPa pressure, seal thickness 40 μm; After sealing, material adopts air cooling way with 8500m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
The sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present embodiment is applied to Huzhou rice terrace, every mu of 15kg, after results, compared with simultaneous test field (using common chemical fertilizer 15kg), paddy rice on average increases production 8%, and in rice paddy seed, the content of selenium is higher 1.2 times than the content of selenium in the rice paddy seed of control experiment.
Embodiment 2
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) 15 parts, urea is got by weight, ammonium chloride 30 parts, ammonium hydrogen phosphate 15 parts, 25 parts, saltpetre, Sodium Selenite 0.5 part, humic acids 30 parts, the Nano microsphere of xylo-oligosaccharide 5 parts, 2 parts, sulphur, hydroxyethyl first propylene 0.1 part, genus bacillus additive 1 part is for subsequent use;
(2) 0.5 part of Sodium Selenite is dissolved in 10 parts of water, adds the Nano microsphere 5 parts of xylo-oligosaccharide as template, stir 2 hours at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 15 parts of urea, 30 parts of ammonium chlorides, ammonium hydrogen phosphate 15 parts, 25 parts, saltpetre, humic acids 30 parts, genus bacillus additive 1 part is mixing fully, stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 2mm;
(4) heat 2 parts of sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.4MPa pressure, coating thickness is 30 μm;
(5) by the 0.1 part of melting of hydroxyethyl first propylene as sealing agent, the material after surface spraying utilizes volume pump to seal under 0.3MPa pressure, seal thickness 20 μm; After sealing, material adopts air cooling way with 8000m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
The sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present embodiment is applied to Huzhou rice terrace, every mu of 15kg, after results, compared with simultaneous test field (using common chemical fertilizer 15kg), paddy rice on average increases production 7%, and in rice paddy seed, the content of selenium is higher 1.1 times than the content of selenium in the rice paddy seed of control experiment.
Embodiment 3
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) get 20 parts, urea by weight, ammonium chloride 40 parts, ammonium hydrogen phosphate 20 parts, 30 parts, saltpetre, Sodium Selenite 1 part, humic acids 40 parts, the Nano microsphere of Rhizoma amorphophalli powder 7 parts, 3 parts, sulphur, 1 part, xylogen, microbe additive 1 part is for subsequent use; Described microbe additive comprises genus bacillus, phosphate solubilizing bacteria, potassium solubilizing bacteria and vinelandii.
(2) 1 part of Sodium Selenite is dissolved in 25 parts of water, adds the Nano microsphere 7 parts of Rhizoma amorphophalli powder as template, stir 6 hours at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 20 parts of urea, 40 parts of ammonium chlorides, ammonium hydrogen phosphate 20 parts, 30 parts, saltpetre, humic acids 40 parts, microbe additive 1 part is mixing fully, stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 4mm;
(4) heat 3 parts of sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.8MPa pressure, coating thickness is 100 μm;
(5) by the 1 part of melting of hydroxyl xylogen as sealing agent, the material after surface spraying utilizes volume pump to seal under 0.45MPa pressure, seal thickness 80 μm; After sealing, material adopts air cooling way with 9000m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
The sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present embodiment is applied to Huzhou rice terrace, every mu of 15kg, after results, compared with simultaneous test field (using common chemical fertilizer 15kg), paddy rice on average increases production 9%, and in rice paddy seed, the content of selenium is higher 1.2 times than the content of selenium in the rice paddy seed of control experiment.
Embodiment 4
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) get 10 parts, urea by weight, ammonium chloride 20 parts, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, Sodium Selenite 0.6 part, humic acids 20 parts, 5 parts, Chinese tamarisk skin powder, 2 parts, sulphur, polyethylene wax 0.5 part, lactic bacteria additive 0.5 part is for subsequent use; Described Chinese tamarisk skin powder is clay into power after Chinese tamarisk skin dries, and crosses 80 mesh sieves and makes.
(2) 0.6 part of Sodium Selenite is dissolved in 12 parts of water, adds 5 parts, Chinese tamarisk skin powder as template, stir 4 hours at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 10 parts of urea, 20 parts of ammonium chlorides, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, humic acids 20 parts, lactic bacteria additive 0.5 part is mixing fully, stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 3mm;
(4) heat 2 parts of sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.6MPa pressure, coating thickness is 60 μm;
(5) by polyethylene wax 0.5 part of melting as sealing agent, the material after surface spraying utilizes volume pump to seal under 0.35MPa pressure, seal thickness 40 μm; After sealing, material adopts air cooling way with 8500m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
The sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present embodiment is applied to Huzhou rice terrace, every mu of 15kg, after results, compared with simultaneous test field (using common chemical fertilizer 15kg), paddy rice on average increases production 12%, and in rice paddy seed, the content of selenium is higher 1.8 times than the content of selenium in the rice paddy seed of control experiment.
Comparative example 1
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) get 10 parts, urea by weight, ammonium chloride 20 parts, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, Sodium Selenite 0.6 part, humic acids 20 parts, the Nano microsphere of oligochitosan 5 parts, polyethylene wax 0.5 part, lactic bacteria additive 0.5 part is for subsequent use;
(2) 0.6 part of Sodium Selenite is dissolved in 12 parts of water, adds the Nano microsphere 5 parts of oligochitosan as template, stir 4 hours at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 10 parts of urea, 20 parts of ammonium chlorides, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, humic acids 20 parts, lactic bacteria additive 0.5 part is mixing fully, stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 3mm;
(5) by polyethylene wax 0.5 part of melting as sealing agent, utilized by selenium-enriched fertilizer volume pump to seal under 0.35MPa pressure, seal thickness 40 μm; After sealing, material adopts air cooling way with 8500m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
The sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present embodiment is applied to Huzhou rice terrace, every mu of 15kg, after results, compared with simultaneous test field (using common chemical fertilizer 15kg), the content that paddy rice on average increases production selenium in the content of selenium and the rice paddy seed of control experiment in 2% rice paddy seed is suitable.
Comparative example 2
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) 10 parts, urea is got by weight, ammonium chloride 20 parts, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, Sodium Selenite 0.6 part, humic acids 20 parts, the Nano microsphere of oligochitosan 5 parts, 2 parts, sulphur, polyethylene wax 0.5 part;
(2) 0.6 part of Sodium Selenite is dissolved in 12 parts of water, adds the Nano microsphere 5 parts of oligochitosan as template, stir 4 hours at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 10 parts of urea, 20 parts of ammonium chlorides, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, humic acids 20 parts is mixing fully, stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 3mm;
(4) heat 2 parts of sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.6MPa pressure, coating thickness is 60 μm;
(5) by polyethylene wax 0.5 part of melting as sealing agent, the material after surface spraying utilizes volume pump to seal under 0.35MPa pressure, seal thickness 40 μm; After sealing, material adopts air cooling way with 8500m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
The sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present embodiment is applied to Huzhou rice terrace, every mu of 15kg, after results, compared with simultaneous test field (using common chemical fertilizer 15kg), paddy rice on average increases production 3%, and in rice paddy seed, the content of selenium is higher 0.8 times than the content of selenium in the rice paddy seed of control experiment.
Comparative example 3
A preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, comprises the following steps:
(1) get 10 parts, urea by weight, ammonium chloride 20 parts, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, Sodium Selenite 0.6 part, humic acids 20 parts, 2 parts, sulphur, polyethylene wax 0.5 part, lactic bacteria additive 0.5 part is for subsequent use;
(2) 0.6 part of Sodium Selenite is dissolved in 12 parts of water, stirs 4 hours at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 10 parts of urea, 20 parts of ammonium chlorides, ammonium hydrogen phosphate 10 parts, 15 parts, saltpetre, humic acids 20 parts, lactic bacteria additive 0.5 part is mixing fully, stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 3mm;
(4) heat 2 parts of sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.6MPa pressure, coating thickness is 60 μm;
(5) by polyethylene wax 0.5 part of melting as sealing agent, the material after surface spraying utilizes volume pump to seal under 0.35MPa pressure, seal thickness 40 μm; After sealing, material adopts air cooling way with 8500m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
The sulphur coating type slowly-releasing selenium-enriched fertilizer prepared by the present embodiment is applied to Huzhou rice terrace, every mu of 15kg, after results, compared with simultaneous test field (using common chemical fertilizer 15kg), paddy rice on average increases production 3%, and in rice paddy seed, the content of selenium is higher 0.6 times than the content of selenium in the rice paddy seed of control experiment.
Sulphur coating type slowly-releasing selenium-enriched fertilizer of the present invention also can be used for 9 kinds of Different Crop such as soybean, peanut, vegetables, and tests, and test area reaches 346 mu.Test-results shows, after using sulphur coating type slowly-releasing selenium-enriched fertilizer, soil with organic matter content significantly increases, and various crop yield significantly improves.As corn on average increase production 10%, oranges and tangerines on average increase production 12%, vegetables on average increase production 15%, other crops such as potato, melon and fruit are also on average increased production more than 10%.
Claims (6)
1. a sulphur coating type slowly-releasing selenium-enriched fertilizer, it is characterized in that, be made up of the component of following parts by weight: urea 10-20 part, ammonium chloride 20-40 part, ammonium hydrogen phosphate 10-20 part, saltpetre 15-30 part, Sodium Selenite 0.5-1.0 part, humic acids 20-40 part, Nano microsphere 4-8 part of natural polysaccharide, coating agent 1-3 part, sealing agent 0.1-1 part, microbe additive 0.5-1.5 part.
2. a kind of sulphur coating type slowly-releasing selenium-enriched fertilizer according to claim 1, it is characterized in that, described natural polysaccharide is oligochitosan, starch, xylo-oligosaccharide, raffinose, stachyose, one or more in Rhizoma amorphophalli powder.
3. a kind of sulphur coating type slowly-releasing selenium-enriched fertilizer according to claim 1, it is characterized in that, described coating agent is sulphur.
4. a kind of sulphur coating type slowly-releasing selenium-enriched fertilizer according to claim 1, it is characterized in that, described sealing agent is polyethylene wax, polystyrene, polyvinyl chloride, polyvinyl alcohol, hydroxyethyl first propylene, Mierocrystalline cellulose, one or more in xylogen.
5. a kind of sulphur coating type slowly-releasing selenium-enriched fertilizer according to claim 1, it is characterized in that, described microbe additive is milk-acid bacteria, yeast, genus bacillus, phosphate solubilizing bacteria, potassium solubilizing bacteria, one or more in vinelandii.
6. a preparation method for sulphur coating type slowly-releasing selenium-enriched fertilizer, is characterized in that, comprise the following steps:
(1) urea 10-20 part is got by weight, ammonium chloride 20-40 part, ammonium hydrogen phosphate 10-20 part, saltpetre 15-30 part, Sodium Selenite 0.5-1.0 part, humic acids 20-40 part, Nano microsphere 4-8 part of natural polysaccharide, sulphur 1-3 part, sealing agent 0.1-1 part, microbe additive 0.5-1.5 part is for subsequent use;
(2) 0.5-1.0 part Sodium Selenite is dissolved in 3-30 part water, adds natural polysaccharide Nano microsphere 4-8 part as template, stir 2-6 hour at normal temperatures, make micro-nano rich selenium and delay controlled release body;
(3) nano-selenium rich is delayed controlled release body and 10-20 part urea, 20-40 part ammonium chloride, ammonium hydrogen phosphate 10-20 part, saltpetre 15-30 part, humic acids 20-40 part, microbe additive 0.5-1.5 part fully mixes, and stirs, obtains compound; By compound granulation, screening obtains the selenium-enriched fertilizer of 2-4mm;
(4) heat 1-3 part sulphur to molten state, utilize volume pump to carry out surface spraying to selenium-enriched fertilizer under 0.4-0.8MPa pressure, coating thickness is 30-100 μm;
(5) by the melting of sealing agent 0.1-1 part, the material after surface spraying utilizes volume pump to seal under 0.3-0.45MPa pressure, seal thickness 20-80 μm; After sealing, material adopts air cooling way with 8000-9000m
3/ h flow carries out staged cooling to coated fertilizer in the cooling drum with staged baffle plate, namely obtains smooth surface, dry sulphur coating type slowly-releasing fertilizer rich in selenium.
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| CN105967953A (en) * | 2016-05-14 | 2016-09-28 | 安徽新天地生物肥业有限公司 | Fertilizer special for peanuts |
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| CN107382560A (en) * | 2017-09-18 | 2017-11-24 | 湖南农业大学 | A kind of grape special fertilizer and preparation method thereof and application process |
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Application publication date: 20160309 |