CN102173960B - Special controlled-release fertilizer for cool-season lawns and preparation method thereof - Google Patents
Special controlled-release fertilizer for cool-season lawns and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a special controlled-release fertilizer for cool-season lawns and a preparation method thereof. The special controlled-release fertilizer is prepared by accurately compounding water-retention heat-preservation composites, sulfur high-molecular polymer coated urea, thermoplastic and thermosetting double-layer coated urea, sulfur coated urea, potassium chloride compound fertilizers, ferrous sulfate and magnesium sulfate. The special controlled-release fertilizer is mainly used for national north area suitable for planting the cool-season lawns and applied for one time every year, has the using amount of 50-70 grams per square meter and is uniformly applied into plough layer soil of 1-20 centimeters or on the soil surface before lawn grass is sown in spring.
Description
Technical field
The present invention relates to a kind of release and release control fertilizer, particularly be used for cold-season type lawn control released fertilizer special and the preparation and the application of north China, belong to the release and release control fertilizer production technical field.
Background technology
The lawn is by artificial planting or artificial maintenance management and can provides people to lie fallow, travel and the shape meadow, level ground of appropriate sports.It has purifying air, improve weather, reduce noise, conserve water and soil and provide the function in movement rest place.Along with development, progress of science and technology and the human living standard's of society raising, the lawn had become the important mainstay industry of American-European countries already.For example the existing lawn of the U.S. is 2.03 hundred million hectares, and green grassland reaches 800 square metres per family.In China, Lawn Industry is started late, but development rapidly, and lawn fraction of coverage every year is with the speed increment of 30%-40%.
The growth temperature that cold-season turfgrass suits is between 15 ℃ to 25 ℃, and temperature is higher than 30 ℃, poor growth.Ground such as China Hebei, Shanxi, Shandong, Shaanxi, Liaoning, Jilin, Gansu are fit to plant cold-season type lawn.Hubei, Hunan, Henan, Jiangxi, Jiangsu, Zhejiang, Guangdong, Fujian, Sichuan, Chongqing then are fit to the plantation warm-season turf.
Because the used lawn species of cold-season type lawn has more different with residing soil nutrient condition of growth and warm-season turf; Turfgrass is also different to nutrient absorbing quantity, uptake rate, nutritive props, so fertile kind, the Nutrient Release of controlled release that cold-season type lawn is executed also should be different to some extent.
Controlled release fertilizer nutrient in soil discharges and depends on two pacing itemss, the one, temperature, the 2nd, moisture.On the outer coating of coating controlled-release fertilizer a large amount of micropores is arranged, it is inner that the water vapor in the soil gets into fertiliser granulates through micropore, discharges through micropore behind the dissolving fertilizer again.After the fertilizer coating design was confirmed, the open size of micropore mainly received the influence of the soil moisture, and temperature is high, and perforate is big, and nutrient discharges fast.The release of controlled release fertilizer nutrient needs moisture to participate in, and water deficient then has a strong impact on the fertile effect of controlled release.Mainly in the north China plantation, temperature is low here for cold-season turfgrass, and rainfall amount is few, and the soil moisture is low, and moisture is few, compares with the southern high-temperature area, and the nutrient of controlled release fertilizer in soil discharges and also have than big-difference.
CN 100448805C (200710115271.1) discloses a kind of special control-release fertilizer for resin coated grassplot and preparation method thereof, and component is composite makes with thermoplastic resin membrane wrapping saltpetre, ammonium phosphate, urea, Repone K composite fertilizer etc. for this patent document.CN101805221A (200910300410.7) discloses a kind of special disease-resistant and long-acting fertilizer for lawn and preparation method thereof, has solved the problem that lawn disease control and fertilizer decrement are used.CN 1326812C (200510112662.9) provides a kind of multifuction slow releasing lawn fertilizer, is formed by grouts, the peat composed of rotten mosses, humic acids, nitrogen phosphorus potassium and trace element, plant-growth regulator compound.CN1587235 (200410050221.6) discloses coated release-controlled special fertilizer for lawn material and method for making thereof; Fertilizer efficiency period reaches 140～260 days, and single-dose application can be satisfied the nutrient requirement of lawn plant whole growing basically, and effect of increasing production is better; Improve utilization rate of fertilizer, saving of labor, laborsaving.
More than four kinds of validity period that the lawn control released fertilizer special has prolonged fertilizer; Solved lawn annual property problem of fertilization; But fertilising also exists two aspects not enough to the north China cold-season type lawn; The one, the nutrient proportioning has only been considered the absorbing state on lawn itself, and does not relate to the difference of northern China and soils in south china nutrient situation; The 2nd, the nutrient of controlled release fertilizer or long-acting fertilizer discharges and receives Influence of Temperature, above-mentioned publication file fertilizer not to consider the influence of the temperature variation of different lawns type growth to the release of controlled release fertilizer nutrient.
Summary of the invention
To the deficiency of prior art, the present invention provides a kind of cold-season type lawn special-purpose control-release fertilizer and preparation method thereof; The dedicated release-controlled fertilizer nutrient proportioning in this lawn is fit to the north China soil nutrient status, the controlled release fertilizer nutrient discharges the relatively low temperature of adaptation, the water conservation heat-insulating property is arranged, and guarantees the nutrition absorption on lawn.
The present invention also provides the application method of a kind of above-mentioned lawn special-purpose control-release fertilizer.
The term explanation:
1, cold-season type lawn refers to the lawn of suitable growth temperature between 15 ℃ to 25 ℃.
2, northern area is meant China Hebei, Shanxi, Shandong, Shaanxi, Liaoning, Jilin, Heilungkiang, Gansu, Ningxia, Xinjiang, Inner Mongol, Beijing, Tianjin etc.
Technical scheme of the present invention is following:
The cold-season type lawn special-purpose control-release fertilizer, raw materials quality part is following:
290～350 parts of water conservation insulation compsns,
Sulphur adds 100～150 parts of high molecular polymer coated carbamides,
80～120 parts of the double-deck coated carbamides of thermoplastic and thermosetting,
70～130 parts in sulfur coating urea,
250～300 parts of Repone K composite fertilizers,
30～60 parts in ferrous sulfate,
30～60 parts in sal epsom.
Said water conservation insulation compsn is to be formed by 300～500 parts in mud, 200～400 parts of the chicken manures that become thoroughly decomposed, 200～300 parts of corn cob meals, 20～40 parts of mixing granulations of water-absorbing resin; Wherein water-absorbing resin is selected from CMC 99.5;
It is to be nuclear core fertilizer with the granular urea that said sulphur adds the high molecular polymer coated carbamide, and spraying inner cladding sulphur film sprays the surrounding layer polymer membrane again and makes earlier; It is 20% that said inner cladding sulphur mould material accounts for nuclear core fertilizer quality per-cent, and the mass percent that polymer membrane accounts for nuclear core fertilizer is 3%; Preferably, said 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.
The double-deck coated carbamide of above-mentioned thermoplastic and thermosetting is to be nuclear core fertilizer with the granular urea, and first coating quality per-cent is 4% inner cladding thermoplastic resin film, and coating quality per-cent is that 3% surrounding layer thermosetting resin film makes again.To be that the rubber powder of the grain flour that reclaims thermoplastic film resin and the mineral powder that accounts for coating agent weight 2-5%, 5-10%, 1-3% is miscible make in the mixed solvent of n-butyl acetate and pentyl acetate 2～5: 1 volume ratio the agent of inner cladding thermoplastic resin membrane wrapping; Surrounding layer is that bisphenol A epoxide resin and solidifying agent diethylenetriamine, thinner ETHYLE ACETATE three get by 1: 0.15～0.25: 0.2～0.3 mass ratio is mixed for thermohardening resin coated dose.The preparation method " reclaims the working method of thermoplastic resin and thermosetting resin multi-layer composite coated controlled-release fertilizer " referring to CN100567222C (200710114124.2), and the present invention quotes the full text of this patent document as prior art.
Said sulfur coating urea is to be nuclear core fertilizer spraying sulphur film with the granular urea, and it is 25% that the sulphur mould material accounts for nuclear core fertilizer quality per-cent, by prior art for preparing.
The above sulphur adds high molecular polymer coated carbamide, thermoplastic and the double-deck coated carbamide of thermosetting, sulfur coating urea can be bought in market, directly is used for compositely, and Shandong Kingenta Bio-engineering Stock Co., Ltd. is on sale.
In the said Repone K composite fertilizer, nitrogen, Vanadium Pentoxide in FLAKES, potassium oxide content are respectively 15wt%, 15wt%, 15wt%.
Said ferrous sulfate, sal epsom, the commercially available prod.
Said water conservation insulation compsn, 2～4 millimeters of preferable particle size.Raw material in the said water conservation insulation compsn is further preferred as follows:
Said mud is the biochemical sludge of sewage work.
The said chicken manure that becomes thoroughly decomposed is by the prior art fermentation maturity.
Said corn cob meal is that the pulverizing of corn cob direct physical makes, and particle diameter is less than 60 orders.
Said water-absorbing resin is one type of macromolecular material with strong water-retaining capacity, preferably carboxymethyl cellulose.
According to the present invention, optimized technical scheme is following:
The cold-season type lawn special-purpose control-release fertilizer, raw materials quality part is following:
320～340 parts of water conservation insulation compsns,
Sulphur adds 115～125 parts of high molecular polymer coated carbamides,
95～105 parts of the double-deck coated carbamides of thermoplastic and thermosetting,
85～95 parts in sulfur coating urea,
260～280 parts of Repone K composite fertilizers,
48～52 parts in ferrous sulfate,
38～42 parts in sal epsom.
The preparation method of cold-season type lawn special-purpose control-release fertilizer of the present invention, step is following:
(1) mud, water-absorbing resin, the chicken manure that becomes thoroughly decomposed, corn cob meal are formed by the formula rate mixing granulation, 2～4 millimeters of particle diameters get water conservation insulation compsn;
(2) with above-mentioned water conservation insulation compsn, sulphur add the high molecular polymer coated carbamide, thermoplastic is put into stirrer by proportioning and was stirred 5～10 minutes with the double-deck coated carbamide of thermosetting, sulfur coating urea, Repone K composite fertilizer, ferrous sulfate, sal epsom, fully mixing promptly gets.
Then with the fertilizer that mixes send into metering, wrapping machine measures, packs.
The application of cold-season type lawn special-purpose control-release fertilizer of the present invention, this fertilizer mainly are applicable to the area that is fit to the plantation cold-season type lawn, like Hebei of China, Shanxi, Shandong, Shaanxi, Liaoning, Jilin, Gansu and other places; Use once every square metre of fertilizer amount 50～70 grams every year.After evenly imposing on soil surface before the turfgrass sowing spring, turn over.
Cold-season type lawn special-purpose control-release fertilizer of the present invention is applied in the relative water deficient of soil and temperature can be in moisture build op around the fertiliser granulates when low; Improve temperature; Guarantee that the fertile normal nutrient of controlled release discharges, improve the utilising efficiency of fertilizer nutrient, promote the healthy and strong growth in lawn.
Excellent results of the present invention is following:
1. the nutrient proportioning is fit to the soil of north China
The lawn is except that absorbing more nitrogen, and the potassium in the soil, magnesium, iron have material impact to its growth.Potassium mainly improves the disease resistance on lawn, and magnesium is synthetic relevant with photosynthesis with the chlorophyll on lawn with iron rule.Receive the influence of soil acidity or alkalinity, effectively iron level is lower in the soil of north China, and potassium, magnesium, iron ratio are inharmonious.Cold-season type lawn special-purpose control-release fertilizer of the present invention is to form according to north China soil nutrient characteristics and the accurate configuration of lawn absorption characteristic, is fit to cold-season type lawn to nutrient demand.
2. nutrient discharges and meets the cold-season type lawn growing area
The nutrient that controlled release is fertile discharges and mainly receives temperature and moisture, and north China temperature is lower, and moisture is relative deficiency also.Compare with China southern high-temperature area, the controlled release fertilizer of same release period can prolong the time of releasing in northern soil, and it is also different that nutrient discharges the peak.Cold-season type lawn special-purpose control-release fertilizer of the present invention is to design according to the north China climatic characteristic, can satisfy the needs that cold-season turfgrass absorbs nutrient.
3. promote the cold-season type lawn growth
Cold-season type lawn special-purpose control-release fertilizer of the present invention contains water conservation, insulation compsn, can store rainfall and irrigate moisture, and the influence that the soil moisture deficiency discharges fertilizer nutrient when alleviating because of arid is for the lawn provides competent nutrient.Fertilizer of the present invention has heat insulation effect simultaneously.Therefore, cold-season type lawn special-purpose control-release fertilizer of the present invention can promote the growth of cold-season turfgrass.
Description of drawings
Fig. 1 is several kinds of main nutrient figure that influence lawn growth in 0～20 centimetre of soil in Hebei province, and X-coordinate is the nutrient kind, and ordinate zou is a nutrient content (unit: mg/kg).
Fig. 2 is several kinds of main nutrient figure that influence lawn growth in 0～20 centimetre of soil in Hunan Province, and X-coordinate is the nutrient kind, and ordinate zou is a nutrient content (unit: mg/kg).
Embodiment
Below in conjunction with embodiment the present invention is further specified, but be not limited thereto.
Mud, Heze, Shandong Province city sewage work.The chicken manure that becomes thoroughly decomposed, big ecological engineering ltd of Heze Nintaus is by the prior art leavened prod.Water-absorbing resin, CMC 99.5, commercially available prod.
Sulphur adds the high molecular polymer coated carbamide, and on behalf of sulphur, model KPS04 (35-0-0), KPS04 add the high molecular polymer coat fertilizer, and the release period in 4 expression this fertilizer 25 ℃ of hydrostatic wherein is 4 months, and 35-0-0 representes nitrogenous 35%, the not phosphorous and potassium of this fertilizer.The double-deck coated carbamide of thermoplastic and thermosetting, model KTP-TS05 (42-0-0), KTP-TS05 represents thermoplastic and thermosetting bilayer coating, wherein 5 represent that the release period of these fertilizer in 25 ℃ of hydrostatic is 5 months, 42-0-0 representes nitrogenous 42%, the not phosphorous and potassium of this fertilizer.Sulfur coating urea, product type are KWS03 (34-0-0).More than the fertile raw material of 3 kinds of controlled releases Shandong Kingenta Bio-engineering Stock Co., Ltd. produce.
In the said Repone K composite fertilizer, nitrogen, Vanadium Pentoxide in FLAKES, potassium oxide content are respectively 15wt%, 15wt%, 15wt%.
Raw material consumption umber among the embodiment is mass parts, and all per-cents are mass percent.
Embodiment 1: the cold-season type lawn special-purpose control-release fertilizer, and raw materials quality part is following:
Water conservation insulation compsn 300kg,
Sulphur adds high molecular polymer coated carbamide 150kg,
The double-deck coated carbamide 80kg of thermoplastic and thermosetting,
Sulfur coating urea 130kg,
Repone K composite fertilizer 250kg,
Ferrous sulfate 60kg,
Sal epsom 30kg.
The preparation method:
(1) get mud 400kg, the chicken manure 300kg that becomes thoroughly decomposed, corn cob meal 270kg, CMC 99.5 30kg mixes, the disk granulation, 2～4 millimeters of particle diameters get water conservation insulation compsn.
(2) novolac epoxy 2kg and triethylene tetramine 0.22kg are mixed, be mixed with high polymer film-coated dose.
Take by weighing the granular urea 100kg of 2～3 millimeters of particle diameters, wrap one deck sulphur earlier by prior art, the sulphur mould material accounts for 20% of nuclear fertilizer quality, wraps above-mentioned high polymer film-coated dose of one deck again, and the coating agent accounts for 3% of nuclear fertilizer quality.Make sulphur and add the high molecular polymer coated carbamide.
(3) 4kg being reclaimed polyvinyl resin, to be dissolved in 67kg n-butyl acetate and pentyl acetate mass ratio be in 3: 1 mixed solvents, adds zeyssatite 0.12kg, wheat-flour 0.24kg, rubber powder 0.08kg, mixes, and is mixed with the agent of thermoplastic resin inner layer film coating.
Bisphenol A epoxide resin 3kg, solidifying agent diethylenetriamine 0.6kg, thinner ETHYLE ACETATE 0.75kg are mixed, be mixed with the agent of thermosetting resin outer membrane coating.
The urea 100kg that the cut-off footpath is 2～3 millimeters, by the prior art above-mentioned thermoplastic resin inner layer film of bag one deck coating agent earlier, the inner layer film material accounts for 4% of urea quality, wraps the agent of the above-mentioned thermosetting resin outer membrane of one deck coating again, and the outer membrane material accounts for 3% of urea quality.Get the double-deck coated carbamide of thermoplastic and thermosetting:
(4) get above-mentioned water conservation insulation compsn, sulphur adds the high molecular polymer coated carbamide, the double-deck coated carbamide of thermoplastic and thermosetting; Sulfur coating urea, Repone K composite fertilizer, ferrous sulfate; Sal epsom is put into stirrer together by proportioning and was stirred 5～10 minutes, and fully mixing promptly gets.Then with the fertilizer that mixes send into metering, wrapping machine measures, packs.
Embodiment 2: the cold-season type lawn special-purpose control-release fertilizer, and raw materials quality part is following:
Water conservation insulation compsn 330kg,
Sulphur adds high molecular polymer coated carbamide 120kg,
The double-deck coated carbamide 100kg of thermoplastic and thermosetting,
Sulfur coating urea 90kg,
Repone K composite fertilizer 270kg,
Ferrous sulfate 50kg,
Sal epsom 40kg.
The preparation method is with embodiment 1.
Embodiment 3: the cold-season type lawn special-purpose control-release fertilizer, and raw materials quality part is following:
Water conservation insulation compsn 350kg,
Sulphur adds high molecular polymer coated carbamide 100kg,
The double-deck coated carbamide 90kg of thermoplastic and thermosetting,
Sulfur coating urea 70kg,
Repone K composite fertilizer 300kg,
Ferrous sulfate 40kg,
Sal epsom 50kg.
The preparation method is with embodiment 1.
Embodiment 4: the cold-season type lawn special-purpose control-release fertilizer, and raw materials quality part is following:
Water conservation insulation compsn 290kg,
Sulphur adds high molecular polymer coated carbamide 140kg,
The double-deck coated carbamide 120kg of thermoplastic and thermosetting,
Sulfur coating urea 80kg,
Repone K composite fertilizer 280kg,
Ferrous sulfate 30kg,
Sal epsom 60kg.
The preparation method is with embodiment 1.
Comparative Examples: universal lawn special-purpose control-release fertilizer, Shandong Kingenta Bio-engineering Stock Co., Ltd. produces, product type CP 35-6-7.
Test place: Shijiazhuang City, Hebei Province city, Changchun, Jilin Province.
Test period: year October in April, 2010 to 2010.
Supply the examination lawn species: Shijiazhuang City is used English grass, and rye grass is used in the Changchun.
Embodiment 1-4 is identical with the Comparative Examples fertilizer amount, every square metre 60 gram.Fertilizing method is after evenly imposing on soil surface before the sowing of lawn spring, to turn over.Effect is seen table 1.
Table 1, compare the effect of embodiment 1-4 with Comparative Examples
Claims (4)
1. cold-season type lawn special-purpose control-release fertilizer is characterized in that raw materials quality part is following:
290～350 parts of water conservation insulation compsns,
Sulphur adds 100～150 parts of high molecular polymer coated carbamides,
80～120 parts of the double-deck coated carbamides of thermoplastic and thermosetting,
70～130 parts in sulfur coating urea,
250～300 parts of Repone K composite fertilizers,
30～60 parts in ferrous sulfate,
30～60 parts in sal epsom;
Said water conservation insulation compsn is to be formed by 300～500 parts in mud, 200～400 parts of the chicken manures that become thoroughly decomposed, 200～300 parts of corn cob meals, 20～40 parts of mixing granulations of water-absorbing resin; Wherein water-absorbing resin is selected from CMC 99.5;
It is to be nuclear core fertilizer with the granular urea that said sulphur adds the high molecular polymer coated carbamide, and spraying inner cladding sulphur film sprays the surrounding layer polymer membrane again and makes earlier; It is 20% that said inner cladding sulphur mould material accounts for nuclear core fertilizer quality per-cent, and the mass percent that polymer membrane accounts for nuclear core fertilizer is 3%; Said high polymer film-coated dose of mixing that is novolac epoxy and triethylene tetramine with 9: 1 mass ratioes;
The double-deck coated carbamide of said thermoplastic and thermosetting is to be nuclear core fertilizer with the granular urea, and first coating quality per-cent is 4% inner cladding thermoplastic resin film, and coating quality per-cent is that 3% surrounding layer thermosetting resin film makes again; The agent of inner cladding thermoplastic resin membrane wrapping be reclaim thermoplastic film resin and the mineral powder that accounts for coating agent weight 2～5%, 5～10% grain flour, 1～3% rubber powder is miscible in the mixed solvent of n-butyl acetate and pentyl acetate 2～5: 1 volume ratio, makes; Surrounding layer is that bisphenol A epoxide resin and solidifying agent diethylenetriamine, thinner ETHYLE ACETATE three make by 1: 0.15～0.25: 0.2～0.3 mixed for thermohardening resin coated dose;
Said sulfur coating urea is to be nuclear core fertilizer spraying sulphur film with the granular urea, and it is 25% that the sulphur mould material accounts for nuclear core fertilizer quality per-cent;
In the said Repone K composite fertilizer, nitrogen, Vanadium Pentoxide in FLAKES, potassium oxide content are respectively 15wt%, 15wt%, 15wt%.
2. cold-season type lawn special-purpose control-release fertilizer as claimed in claim 1 is characterized in that raw materials quality part is following:
320～340 parts of water conservation insulation compsns,
Sulphur adds 115～125 parts of high molecular polymer coated carbamides,
95～105 parts of the double-deck coated carbamides of thermoplastic and thermosetting,
85～95 parts in sulfur coating urea,
260～280 parts of Repone K composite fertilizers,
48～52 parts in ferrous sulfate,
38～42 parts in sal epsom.
3. the preparation method of claim 1 or 2 described cold-season type lawn special-purpose control-release fertilizers, step is following:
(1) mud, water-absorbing resin, the chicken manure that becomes thoroughly decomposed, corn cob meal are formed by the formula rate mixing granulation, 2～4 millimeters of particle diameters get water conservation insulation compsn;
(2) with above-mentioned water conservation insulation compsn, sulphur add the high molecular polymer coated carbamide, thermoplastic is put into stirrer by proportioning and was stirred 5～10 minutes with the double-deck coated carbamide of thermosetting, sulfur coating urea, Repone K composite fertilizer, ferrous sulfate, sal epsom, fully mixing promptly gets.
4. the application of claim 1 or 2 described cold-season type lawn special-purpose control-release fertilizers is used for northern cold-season type lawn growing area, uses every year once, and every square metre of fertilizer amount 50～70 grams are turned over after evenly imposing on soil surface before the turfgrass sowing spring.
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| CN102775220A (en) * | 2012-08-22 | 2012-11-14 | 张�浩 | Disintegratable round-granule sulfur magnesium fertilizer and preparation method thereof |
| CN102826915B (en) * | 2012-09-19 | 2014-05-28 | 山东农业大学 | Unsaturated polyester resin coated controlled-release fertilizer with sulfur as base coating and preparation method thereof |
| CN105967899A (en) * | 2016-06-22 | 2016-09-28 | 安徽万利生态园林景观有限公司 | Cool-season-type grassland slow-release fertilizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101823923A (en) * | 2010-04-29 | 2010-09-08 | 山东金正大生态工程股份有限公司 | Seed-friendly corn-specific controlled-release fertilizer |
| CN101870624A (en) * | 2010-06-13 | 2010-10-27 | 山东金正大生态工程股份有限公司 | Rice special controlled-release fertilizer applied once in processes of rice transplantation and seedling culture and preparation method thereof |
| CN101891550A (en) * | 2010-07-26 | 2010-11-24 | 菏泽金正大生态工程有限公司 | Synchronous nutrient controlled release fertilizer special for cotton and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101823923A (en) * | 2010-04-29 | 2010-09-08 | 山东金正大生态工程股份有限公司 | Seed-friendly corn-specific controlled-release fertilizer |
| CN101870624A (en) * | 2010-06-13 | 2010-10-27 | 山东金正大生态工程股份有限公司 | Rice special controlled-release fertilizer applied once in processes of rice transplantation and seedling culture and preparation method thereof |
| CN101891550A (en) * | 2010-07-26 | 2010-11-24 | 菏泽金正大生态工程有限公司 | Synchronous nutrient controlled release fertilizer special for cotton and application thereof |
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