CN102557841A - Sustained and controlled release nitrogen fertilizer suitable for being applied to crops in low temperature arid areas and preparation and application - Google Patents
Sustained and controlled release nitrogen fertilizer suitable for being applied to crops in low temperature arid areas and preparation and application Download PDFInfo
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- CN102557841A CN102557841A CN201110435450XA CN201110435450A CN102557841A CN 102557841 A CN102557841 A CN 102557841A CN 201110435450X A CN201110435450X A CN 201110435450XA CN 201110435450 A CN201110435450 A CN 201110435450A CN 102557841 A CN102557841 A CN 102557841A
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Abstract
The invention relates to a sustained and controlled release nitrogen fertilizer suitable for being applied to crops in low temperature arid areas as well as a preparation and an application thereof. The sustained and controlled release nitrogen fertilizer comprises raw materials in part by weight as follows: 90 to 180 parts of 5% humic acid coated urea, 250 to 360 parts of 7.5% humic acid coated urea, 250 to 360 parts of sulfur coated urea, 100 to 200 parts of sulfur plus 2% high polymer coated urea, and 40 to 120 parts of sulfur plus 3% high polymer coated urea. A nutrient release law of the sustained and controlled release nitrogen fertilizer disclosed by the invention is particularly suitable for the absorption requirements for different growth stages of the crops in the low temperature arid areas and satisfies the requirements for the whole growth periods of most crops in the low temperature arid areas, and additional fertilizers are not required in one-time fertilize application. The invention further provides a preparation method and an application method of the sustained and controlled release nitrogen fertilizer.
Description
Technical field
The present invention relates to a kind of fertilizer, the particularly a kind of slow controlled release nitrogenous fertilizer of Compositional type and preparation and application that is exclusively used in low temperature, dry crop applying belongs to sustained-controll-release fertiliser production and applied technical field.
Background technology
The annual agricultural of China is with more than 3,000 ten thousand tons in nitrogenous fertilizer at present.Though using of nitrogenous fertilizer played vital role to improving crop yield, along with the increase of consumption, utilization rate of fertilizer descends, and the environmental pollution that causes because of fertilising also obviously increases.Because the nutrient of slow controlled release nitrogenous fertilizer is to discharge along with crop absorbs slowly, water-soluble nitrogen residence time in soil is short, and fertilizer loss is few, and utilization ratio is high, and is little to the influence of environment, and therefore, slow controlled release nitrogenous fertilizer becomes the developing direction of nitrogenous fertilizer.
CN1948227 (200510030371.5) discloses a kind of improved sulfur coated thiourea slow release fertilizer and method of manufacture; CN101088971 (200610087365.8) provides a kind of long-acting slowly released nitrogen fertilizer; CN101260008 (200710071865.7) is the preparation method of urea formaldehyde; CN101050152 (200710014760.8), CN101041593 (200710038135.7), CN102001890A (201010582386.3), CN102167650A (201110028857.0) provide the preparation method of slow-release nitrogen fertilizer, a kind of slow-release nitrogen fertilizer and method of manufacture thereof, a kind of rosin-attapulgite-composite coated slow-released nitrogenous fertilizer of paraffin of trace element in a kind of containing and preparation method thereof and a kind of gypsum base urea gypsum-urea-sulphur ammonium control release urea respectively.These slow controlled release nitrogenous fertilizer have certain slowly-releasing or long-acting function, can increase nitrogenous fertilizer working lipe, improve fertilizer utilization efficiency.But weak point is also arranged, the one, only depend on a kind of slow-release material (even if matrix material) to be difficult to satisfy the nutrient requirement of crop different growing; Secondly, their nutrient discharges and also is difficult to be fit to low temperature, dry crop absorption requirement.
Low temperature, dry are because ground temperature is low, soil water content is few relatively; Many at high temperature, area of heavy rainfull nutrient release ratio height; To the effective slow controlled release nitrogen fertilizers of crop yield; Such as the bigger thermohardening resin coated material of temperature influence and the slow controlled release nitrogenous fertilizer that receives moisture condition to influence tangible thermoplastic resin membrane wrapping material produce at low temperature, that dry crop growth period nutrient discharges ratio is low, crop yield is not obvious, even the underproduction.
Summary of the invention
To the deficiency of prior art, the present invention provides a kind of slow controlled release nitrogenous fertilizer that is applicable to low temperature, dry crop and preparation method thereof, and the present invention also provides the application method of this fertilizer.
Summary of the invention
Since two thousand five; The applicant has carried out the field experiment of crops such as a large amount of paddy rice, corn, cotton in provinces such as China Dark Longjiang, Liaoning, Jilin, Inner Mongol, Xinjiang; Studied the nutrient release conditions of multiple coating nitrogenous fertilizer in soil, to the production-increasing function of crop and the effect after cooperatively interacting; Propose the slow controlled release nitrogenous fertilizer of a kind of Compositional type, the nutrient element releasing rule of fertilizer of the present invention is specially adapted to low temperature, the absorption requirement of dry crop different bearing stage.This fertilizer nutrient discharges and satisfies these regional most of crop requirements basically.And carried out field experiment, obtained good effect.
The term explanation:
1, low temperature, dry; Be meant in 1 year >=10 ℃ of accumulated temperature below 1500 °, annual rainfall is less than 400 millimeters cool temperature zone and area, middle temperate zone; Mainly contain Xinjiang, Gansu, Inner Mongol, Heilungkiang, Jilin, Liaoning Province what China met this condition, and the some areas in Tibet, Qinghai, Shaanxi.
Technical scheme of the present invention is following:
Low temperature, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, raw materials quality part is following:
90～180 parts in 5% humic acid membrane wrapping urea,
250～360 parts in 7.5% humic acid membrane wrapping urea,
250～360 parts in sulfur coating urea,
Sulphur adds 100～200 parts in 2% high polymer film-coated urea,
Sulphur adds 40～120 parts in 3% high polymer film-coated urea.
Said 5% humic acid membrane wrapping urea, 7.5% humic acid membrane wrapping urea are respectively spray one layer binders outside granular urea, spray the weathered coal of the air-dry pulverizing of one deck again, form the humic acid membrane wrapping layer.Solidifying back repetition coating makes for 1～2 time.Said sticker total amount account for the granular urea quality 0.5～1%, weathered coal accounts for 5%, 7.5% of granular urea quality.Weathered coal accounts for 5% of granular urea quality and is 5% humic acid membrane wrapping urea; Weathered coal accounts for 7.5% of granular urea quality and is 7.5% humic acid membrane wrapping urea.Preferably, said sticker is that epoxy resin dihydroxyphenyl propane and solidifying agent T31 get by 1: 0.1 mass ratio is mixed; Described weathered coal powder particle diameter 0.10-0.20mm.
Above-mentioned 5% humic acid membrane wrapping urea, 7.5% humic acid membrane wrapping urea market are on sale; For example Shandong Kingenta Bio-engineering Stock Co., Ltd. produces and sells; Also can be by patent document CN100556866C (200810139610.4) disclosed " a kind of humic acid control-releasing fertilizer and preparation method thereof " preparation, the present invention quotes the full text of this patent document as prior art.Wherein, the preferred granular urea of nuclear core fertilizer urea, 2～3 millimeters of particle diameters.
Said sulfur coating urea is to be nuclear core fertilizer spraying sulphur film with the granular urea, and it is 20～25% that the sulphur mould material accounts for nuclear core fertilizer urea quality per-cent, by prior art for preparing.
Said sulphur adds 2% high polymer film-coated urea, sulphur adds 3% high polymer film-coated urea and is, is respectively nuclear core fertilizer with the granular urea, and spraying inner cladding sulphur film sprays the surrounding layer polymer membrane again and makes earlier; Wherein, it all is 18% that inner cladding sulphur film accounts for nuclear core fertilizer urea quality, and the surrounding layer polymer membrane accounts for that total mass is respectively 2%, 3% behind the urea bag sulphur; The surrounding layer polymer membrane accounts for that the sulphur that is of total mass 2% adds 2% high polymer film-coated urea behind the urea bag sulphur; The surrounding layer polymer membrane accounts for 3% of total mass behind the urea bag sulphur and is sulphur and adds 3% high polymer film-coated urea.Preferably, high polymer film-coated dose of mixing that is novolac epoxy and triethylene tetramine with 9: 1 mass ratioes.The preparation method is referring to CN1246265C (200410024050.X) " is the preparation method of the high polymer film-coated controlled release fertilizer of undercoat with sulphur ", and the present invention quotes the full text of this patent document as prior art.Wherein, the preferred granular urea of nuclear core fertilizer urea, 2～3 millimeters of particle diameters.
According to the present invention, preferred, low temperature, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, raw materials quality part is following:
95～105 parts in 5% humic acid membrane wrapping urea,
340～360 parts in 7.5% humic acid membrane wrapping urea,
290～310 parts in sulfur coating urea,
Sulphur adds 145～155 parts in 2% high polymer film-coated urea,
Sulphur adds 95～105 parts in 3% high polymer film-coated urea.
The preparation method of low temperature of the present invention, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, step is following:
The preparation of (1) 5% humic acid membrane wrapping urea, 7.5% humic acid membrane wrapping urea:
A, extracting epoxy resin dihydroxyphenyl propane and solidifying agent T31 mix by 1: 0.1 mass ratio, get sticker.
B, a certain amount of granular urea is put into encapsulation tool; Be preheated to 60-70 ℃; Sticker with the steps A preparation under pressure evenly sprays on the urea granules of motion, forms one deck adhensive membrane, and the mass ratio that sticker accounts for urea granules is 0.25～0.33%.
C, the solid weathered coal of pulverizing is sprayed on the urea granules that step B has sticker, the mass ratio that weathered coal accounts for urea granules is 2.5%, solidifies the back and forms the humic acid membrane wrapping layer.
D, with step B, C repetitive operation 1 time again, 5% humic acid membrane wrapping urea; With step B, C repetitive operation 2 times again, 7.5% humic acid membrane wrapping urea.
(2) sulfur coating urea: by prior art for preparing, it is 20～25% that the sulphur mould material accounts for nuclear core fertilizer quality per-cent.
(3) sulphur adds 2% high polymer film-coated urea, sulphur adds 3% high polymer film-coated urea: be nuclear core fertilizer with the granular urea, spray inner cladding sulphur film earlier, the sulphur film accounts for 18% of nuclear core fertilizer urea quality; Spray the surrounding layer polymer membrane again, polymer membrane accounts for and is coated with 2% of fertiliser granulates total mass behind the sulphur, sulphur add 2% high polymer film-coated urea; Polymer membrane accounts for and is coated with 3% of fertiliser granulates total mass behind the sulphur, sulphur add 3% high polymer film-coated urea.High polymer film-coated agent prescription is; Novolac epoxy and triethylene tetramine are with the mixing of 9: 1 mass ratioes; The technology that provides by CN1246265C (200410024050.X) " is the preparation method of the high polymer film-coated controlled release fertilizer of undercoat with sulphur " sprays on the fertiliser granulates that is coated with behind the sulphur, promptly gets.
(4) sulphur that the sulfur coating urea that the 5% humic acid membrane wrapping urea that in proportion above-mentioned steps (1) is made, 7.5% humic acid membrane wrapping urea, step (2) make, step (3) make adds 2% high polymer film-coated urea, sulphur and adds 3% high polymer film-coated urea and put into stirrer together and stirred 4～6 minutes, and fully mixing promptly gets.Then the fertilizer that mixes is measured, packs.
The application of low temperature of the present invention, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, fertilizer amount is amounted to into purity nitrogen, and 8～12 kilograms every mu, according to the plantation characteristics of Different Crop, application process is following:
I. disposable spreading fertilizer over the fields behind soil surface turned over, sowed before the dense planting crop was adopted sowing; Or,
Ii. planting the crop of planting the line-spacing broad adopts the disposable distance that applies to sow 5～7 centimetres of row, leave in the soil of 8～10 centimetres of the face of land degree of depth.
Excellent results of the present invention is following:
1, nutrient discharges and can satisfy the crop needs better
Low temperature of the present invention, the slow controlled release nitrogenous fertilizer of dry crop are composite according to nutrient element releasing rule and the most of crop nitrogen absorption characteristics of used various coated carbamide raw materials in this area's soil; Effectively adjust the total nutrient element releasing rule of fertilizer, can satisfy the nutrition absorption needs of crop different growing better.Applied once need not topdress.
2, reduce the fertiliser prodn cost
Generally speaking, absorb requirement, then need spend higher production cost if require a kind of nutrient element releasing rule of controlled release nitrogenous fertilizer of coated fertilizer production can satisfy crop.The controlled release nitrogenous fertilizer of the different coated fertilizer productions of fertilizer utilization of the present invention carries out composite, not only can satisfy crop and absorb requirement, also obviously reduces the production cost of fertilizer.
Description of drawings
Fig. 1 is the nutrient element releasing rule graphic representation of embodiment 1 used slow controlled release nitrogenous fertilizer raw material in Chifeng City, Inner Mongol soil, X-coordinate be in the incorporation of fertilizerin the soil time (my god), ordinate zou is nutrient release rate (mass percent).
Fig. 2 is the special-purpose slow nutrient releasing curve diagram of controlled release nitrogenous fertilizer in Chifeng City, Inner Mongol soil of embodiment 1 low temperature, dry crop; X-coordinate be in the incorporation of fertilizerin the soil time (my god), ordinate zou is per 1000 kilograms of fertilizer nutrient burst sizes of the present invention (kilogram).
Embodiment
Below in conjunction with embodiment the present invention is further specified, but be not limited thereto.Raw material consumption umber among the embodiment is mass parts, and all per-cents are mass percent.Raw material used among the embodiment is following:
5% humic acid membrane wrapping urea is spray one layer binder outside granular urea, sprays the weathered coal of the air-dry pulverizing of one deck again, forms the humic acid membrane wrapping layer; Weathered coal accounts for 5% of granular urea quality.Shandong Kingenta Bio-engineering Stock Co., Ltd. produces and sells
7.5% humic acid membrane wrapping urea is respectively spray one layer binder outside granular urea, sprays the weathered coal of the air-dry pulverizing of one deck again, forms the humic acid membrane wrapping layer; Weathered coal accounts for 7.5% of granular urea quality.
It is 23% that sulfur coating urea, sulphur mould material account for nuclear core fertilizer quality per-cent, and Shandong Kingenta Bio-engineering Stock Co., Ltd. produces.
Sulphur adds 2% high polymer film-coated urea, sulphur, and to add 3% high polymer film-coated urea be that Shandong Kingenta Bio-engineering Stock Co., Ltd. produces; Inner cladding sulphur film accounts for 18% of nuclear core fertilizer urea quality; The surrounding layer polymer membrane accounts for 2% and 3% of total mass behind the urea bag sulphur respectively, high polymer film-coated dose of mixing that is novolac epoxy and triethylene tetramine with 9: 1 mass ratioes.
Above raw material Shandong Kingenta Bio-engineering Stock Co., Ltd. is on sale.
Weathered coal, surface mines coal works, Ningwu County, Shanxi Province produces, organic content 60.2wt%, particle diameter 0.15mm.
Embodiment 1: low temperature, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, and raw materials quality part is following:
5% humic acid membrane wrapping urea 150kg,
7.5% humic acid membrane wrapping urea 310kg,
Sulfur coating urea 360kg,
Sulphur adds 2% high polymer film-coated urea 100kg,
Sulphur adds 3% high polymer film-coated urea 80kg.
The preparation method:
The preparation of (1) 5% humic acid membrane wrapping urea, 7.5% humic acid membrane wrapping urea:
5 kilograms of A, extracting epoxy resin dihydroxyphenyl propanes add 0.5 kilogram of solidifying agent T31, mix, and get sticker;
B, get granular urea and put into encapsulation tool for 500 kilograms, be preheated to 63 ℃, 1.25 kilograms of the stickers of steps A preparation are evenly sprayed on the urea granules of motion, form one deck adhensive membrane through pressure pump;
C, 12.5 kilograms of solid weathered coals will crossing 100 mesh sieves evenly spray on the urea granules that step B has sticker, solidify the back and form the humic acid membrane wrapping layer;
D, with step B, C repetitive operation 1 time again, 5% humic acid membrane wrapping urea;
E, get 350 kilograms in the 5% humic acid membrane wrapping urea of step D preparation, with step B, C repetitive operation 1 time again, 7.5% humic acid membrane wrapping urea;
(2) by prior art for preparing sulfur coating urea, it is 23% that the sulphur mould material accounts for nuclear core fertilizer urea quality per-cent.
(3) sulphur adds the preparation that 2% high polymer film-coated urea, sulphur add 3% high polymer film-coated urea:
A, by prior art for preparing sulfur coating urea, it is 18% that the sulphur mould material accounts for nuclear core fertilizer urea quality per-cent.
B, get 9 kilograms of novolac epoxys, add 1 kilogram of triethylene tetramine, mix, sub-polymer coating agent secures satisfactory grades;
C, the sulfur coating urea of getting steps A preparation are put into coating machine; High polymer film-coated dose of step B preparation evenly sprayed on the sulfur coating urea granules of motion; High polymer film-coated dose of mass ratio that accounts for sulfur coating urea is 2%, gets sulphur and adds 2% high polymer film-coated urea;
D, the sulfur coating urea of getting steps A preparation are put into coating machine; High polymer film-coated dose of step B preparation evenly sprayed on the sulfur coating urea granules of motion; High polymer film-coated dose of mass ratio that accounts for sulfur coating urea is 3%, gets sulphur and adds 3% high polymer film-coated urea;
(4) with above-mentioned 5% humic acid membrane wrapping urea 150kg; 7.5% humic acid membrane wrapping urea 310kg; Sulfur coating urea 360kg, sulphur add 2% high polymer film-coated urea 100kg, and sulphur adds 3% high polymer film-coated urea 80kg; Put into stirrer together and stirred 4 minutes, fully mixing promptly gets.Then the fertilizer that mixes is measured, packs.
Embodiment 2: low temperature, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, and raw materials quality part is following:
5% humic acid membrane wrapping urea 100kg,
7.5% humic acid membrane wrapping urea 350kg,
Sulfur coating urea 300kg,
Sulphur adds 2% high polymer film-coated urea 150kg,
Sulphur adds 3% high polymer film-coated urea 100kg.
The preparation method is with embodiment 1.
Embodiment 3: low temperature, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, and raw materials quality part is following:
5% humic acid membrane wrapping urea 180kg,
7.5% humic acid membrane wrapping urea 250kg,
Sulfur coating urea 250kg,
Sulphur adds 2% high polymer film-coated urea 200kg,
Sulphur adds 3% high polymer film-coated urea 120kg.
The preparation method: different is like embodiment 1:
The preparation of (1) 5% humic acid membrane wrapping urea, 7.5% humic acid membrane wrapping urea
Epoxy resin dihydroxyphenyl propane and solidifying agent T31 mix by 1: 0.1 mass ratio, get sticker;
Get granular urea and put into encapsulation tool for 200 kilograms, be preheated to 70 ℃, 0.66 kilogram of the sticker of steps A preparation is evenly sprayed on the urea granules of motion, form one deck adhensive membrane through pressure pump; 5 kilograms of the solid weathered coals of crossing 100 mesh sieves are evenly sprayed on the urea granules that step B has sticker, solidify the back and form the humic acid membrane wrapping layer; Repetitive operation is 1 time again, gets 5% humic acid membrane wrapping urea;
Other gets granular urea and puts into encapsulation tool for 300 kilograms, is preheated to 68 ℃, 1 kilogram of described sticker is evenly sprayed on the urea granules of motion through pressure pump, forms one deck adhensive membrane; The solid weathered coal of crossing 100 mesh sieves is evenly sprayed on the urea granules that has sticker for 7.5 kilograms, solidify the back and form the humic acid membrane wrapping layer; Repetitive operation is 2 times again, gets 7.5% humic acid membrane wrapping urea;
All the other feedstock production are with embodiment 1.
With above-mentioned 5% humic acid membrane wrapping urea 180kg; 7.5% humic acid membrane wrapping urea 250kg; Sulfur coating urea 250kg, sulphur add 2% high polymer film-coated urea 200kg, and sulphur adds 3% high polymer film-coated urea 120kg; Put into stirrer together and stirred 6 minutes, fully mixing promptly gets.Then the fertilizer that mixes is measured, packs.
Embodiment 4: low temperature, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, and raw materials quality part is following:
5% humic acid membrane wrapping urea 130kg,
7.5% humic acid membrane wrapping urea 330kg,
Sulfur coating urea 320kg,
Sulphur adds 2% high polymer film-coated urea 180kg,
Sulphur adds 3% high polymer film-coated urea 40kg.
The preparation method is with embodiment 3.
Comparative Examples: common urea, nitrogen content 46%, mass percent.
The effect of above embodiment 1～4 and Comparative Examples is following:
Test place: Qing'an County, Heilongjiang Province, Xinjiang autonomous region Changji City.
Test period: year October in May, 2011 to 2011.
Confession studies thing and kind: the Qing'an County is a corn, corn variety: elder generation beautiful 335; The Changji City is a cotton, cotton variety: new land early No. 23.
Embodiment 1-4 is identical with Comparative Examples fertilizer nitrogen nutrient consumption, 12 kilograms every mu of corns, 8 kilograms every mu in cotton.Embodiment fertilizer application process is disposable applying in about 6 centimetres of distance sowing row, the dark about 8 centimetres soil in liftoff surface when corn and sowing cotton seed.The fertilizing method of Comparative Examples common urea is that corn imposed in " typhon mouth " phase; Cotton, 30% uses with method with phosphorus, potash fertilizer, and the urea fertilizer of surplus imposes in cotton " full-bloom stage ".When use in the land for growing field crops; The Compositional type sustained/controlled release urea of embodiment 1-4 and the experimental group of Comparative Examples common urea are all joined and are executed phosphate fertilizer and potash fertilizer; Corn is by nitrogen: Vanadium Pentoxide in FLAKES: potassium oxide=1: 0.3: 0.6, cotton are by nitrogen: Vanadium Pentoxide in FLAKES: potassium oxide=1: 0.4: 0.3 nutrient quality matches well and executes phosphate fertilizer and potash fertilizer; Phosphate fertilizer is used Repone K with superphosphate of lime, potash fertilizer, and the phosphate fertilizer of embodiment and Comparative Examples and potash fertilizer all are disposablely before plantation is ploughed evenly to spread fertilizer over the fields in the face of land.Other control measures are identical.Effect is seen table 1.
Table 1. is compared the application effect of embodiment 1-4 with Comparative Examples
Claims (4)
1. controlled release nitrogenous fertilizer is delayed in low temperature, the special use of dry crop, it is characterized in that raw materials quality part is following:
90～180 parts in 5% humic acid membrane wrapping urea,
250～360 parts in 7.5% humic acid membrane wrapping urea,
250～360 parts in sulfur coating urea,
Sulphur adds 100～200 parts in 2% high polymer film-coated urea,
Sulphur adds 40～120 parts in 3% high polymer film-coated urea;
Said 5% humic acid membrane wrapping urea, 7.5% humic acid membrane wrapping urea are respectively that spray one layer binder sprays the weathered coal of the air-dry pulverizing of one deck again outside granular urea, forms the humic acid membrane wrapping layer; Solidify the back and repeat coating and make for 1～2 time, said sticker total amount account for the granular urea quality 0.5～1%, weathered coal accounts for 5%, 7.5% of granular urea quality;
Said sulfur coating urea is to be nuclear core fertilizer spraying sulphur film with the granular urea, and it is 20～25% that the sulphur mould material accounts for nuclear core fertilizer urea quality per-cent;
Said sulphur adds 2% high polymer film-coated urea, sulphur adds 3% high polymer film-coated urea and is, is respectively nuclear core fertilizer with the granular urea, and spraying inner cladding sulphur film sprays the surrounding layer polymer membrane again and makes earlier; Wherein, inner cladding sulphur film accounts for 18% of nuclear core fertilizer urea quality, and the surrounding layer polymer membrane accounts for 2%, 3% of total mass behind the urea bag sulphur; Said high polymer film-coated dose of mixing that is novolac epoxy and triethylene tetramine with 9: 1 mass ratioes.
2. low temperature as claimed in claim 1, the special-purpose slow controlled release nitrogenous fertilizer of dry crop is characterized in that raw materials quality part is following:
95～105 parts in 5% humic acid membrane wrapping urea,
340～360 parts in 7.5% humic acid membrane wrapping urea,
290～310 parts in sulfur coating urea,
Sulphur adds 145～155 parts in 2% high polymer film-coated urea,
Sulphur adds 95～105 parts in 3% high polymer film-coated urea.
3. the preparation method of controlled release nitrogenous fertilizer is delayed in claim 1 or 2 described low temperature, the special use of dry crop, and step is following:
The preparation of (1) 5% humic acid membrane wrapping urea, 7.5% humic acid membrane wrapping urea:
A, extracting epoxy resin dihydroxyphenyl propane and solidifying agent T31 mix by 1: 0.1 mass ratio, get sticker;
B, a certain amount of granular urea is put into encapsulation tool; Be preheated to 60-70 ℃; Sticker with the steps A preparation under pressure evenly sprays on the urea granules of motion, forms one deck adhensive membrane, and the mass ratio that sticker accounts for urea granules is 0.25～0.33%;
C, the solid humic acids is sprayed on the urea granules that step B has sticker, the mass ratio that humic acids accounts for urea granules is 2.5%, solidifies the back and forms the humic acid membrane wrapping layer;
D, with step B, C repetitive operation 1 time again, 5% humic acid membrane wrapping urea; With step B, C repetitive operation 2 times again, 7.5% humic acid membrane wrapping urea;
(2) sulfur coating urea: by prior art for preparing, it is 20～25% that the sulphur mould material accounts for nuclear core fertilizer quality per-cent;
(3) sulphur adds 2% high polymer film-coated urea, sulphur adds 3% high polymer film-coated urea: be nuclear core fertilizer with the granular urea, spray inner cladding sulphur film earlier, the sulphur film accounts for 18% of nuclear core fertilizer urea quality; Spray the surrounding layer polymer membrane again, polymer membrane accounts for and is coated with 2% of fertiliser granulates total mass behind the sulphur, for sulphur adds 2% high polymer film-coated urea; Polymer membrane accounts for and is coated with 3% of fertiliser granulates total mass behind the sulphur, sulphur add 3% high polymer film-coated urea; High polymer film-coated agent prescription is that novolac epoxy and triethylene tetramine are with the mixing of 9: 1 mass ratioes;
(4) sulphur that the sulfur coating urea that the 5% humic acid membrane wrapping urea that in proportion above-mentioned steps (1) is made, 7.5% humic acid membrane wrapping urea, step (2) make, step (3) make adds 2% high polymer film-coated urea, sulphur and adds 3% high polymer film-coated urea and put into stirrer together and stirred 4～6 minutes, and fully mixing promptly gets.
4. the application of claim 1 or 2 described low temperature, the special-purpose slow controlled release nitrogenous fertilizer of dry crop, fertilizer amount is amounted to into purity nitrogen, and 8～12 kilograms every mu, application process is following:
I. disposable spreading fertilizer over the fields behind soil surface turned over, sowed before the dense planting crop was adopted sowing; Or,
Ii. planting the crop of planting the line-spacing broad adopts the disposable distance that applies to sow 5～7 centimetres of row, leave in the soil of 8～10 centimetres of the face of land degree of depth.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103483110A (en) * | 2013-09-06 | 2014-01-01 | 天津芦阳化肥股份有限公司 | Whole-process nutrient supply type composite fertilizer and preparation method thereof |
| CN103483110B (en) * | 2013-09-06 | 2015-09-09 | 天津芦阳化肥股份有限公司 | Whole process is for nutrient compound manure and preparation method thereof |
| CN114751791A (en) * | 2022-05-19 | 2022-07-15 | 云南省农业科学院农业环境资源研究所 | Slow-release fertilizer special for amomum tsao-ko and capable of being applied once in a year |
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| CN102557841B (en) | 2013-02-06 |
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