CN1380272A - Long-acting water-retaining complex fertilizer and its preparation method and special-purpose equipment - Google Patents
Long-acting water-retaining complex fertilizer and its preparation method and special-purpose equipment Download PDFInfo
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Abstract
The long-acting water-retaining composite mixed fertilizer is formed from fertilizer, ammonia stabilizing agent and water-retaining agent, their weight portion ratio of 100-300 portions of fertilizer, 0.2-4 portions of stabilizing agent and 5-100 portions of water-retaining agent. The described ammonia stabilizing agent is dicyanodiamide, and in the fertilizer the phosphate fertilizer, potassium fertilizer, trace element and light burned magnesium and humic acid or iron oxide also can be added. As compared with general chemical fertilizer it can raise yield by 10-20%.
Description
The present invention relates to a kind of composite fertilizer, the preparation method of this composite fertilizer and equipment thereof provide a kind of long-acting water-retaining complex fertilizer and preparation method thereof and specific equipment specifically.
Water-holding agent claims water-retaining agent again, wetting Agent for Printing Inks, and polymer water-absorbent, High hydrophilous resin is a kind of organic high molecular polymer, and the network molecule chain is arranged in its molecular structure.Water-holding agent runs into water electrolysis promptly takes place later on, dissociate into the ion of positively charged and negative electricity, therefore the ion of this positively charged and negative electricity and water have the intensive affinity interaction, make it have extremely strong water-absorbent and water-retentivity, rapidly the water of high hundreds of times even thousands of times of specific absorption own wt.The suction after is a hydrogel, can slowly discharge to be made for thing and to absorb, and once suctions can be made for thing behind the water and absorb about 3-6 month, and water-holding agent has absorbent function repeatedly, can preserve 3-5 under the situation that is not subjected to uviolizing in soil.Just developed the polymer water-holding agent at the mid-1970s, and applied it in the agriculture production gradually.
Fertilizer is that the grain of plant, particularly chemical fertilizer are to playing the effect that can not be substituted in the agriculture production.Yet chemical fertilizer utilization ratio, especially utilization rate of nitrogen fertilizer is lower.In order to address this problem, the scientific worker furthers investigate long-actingization of nitrogenous fertilizer, develops long-acting nitrogenous fertilizer such as long-acting carbamide and long-acting ammonium bicarbonate, and obtains utilizing in China.In addition, the slow-release fertilizer similar to above-mentioned this controlled availability fertilizer is very fast in market developments such as the U.S., West Europe, Japan, so the development long-acting fertilizer is to improve the important means of nitrogen utilization efficiency.
As a kind of means of impelling long-actingization of fertilizer, in chemical fertilizer, add a certain amount of nitrification inhibitor or urease inhibitor exactly and the composite chemical fertilizer that obtains.
Nitrification inhibitor is a kind of organic compound that can effectively control nitrifying process.Controlling nitrated is exactly not influence mineralization generation NH
4 +Prerequisite under, suppress the first step of nitrification, NH by a kind of special inhibitor
4 +Be oxidized to NO
2 -Process, make nitrogen with NH
4 +Form is retained in the soil, to prolong the supply time of adjusting nitrogen.There is the compound of inhibiting nitrification effect to be mainly the derivative of pyridine, pyrimidine, thiocarbamide, thiazole, triazole, aniline, phenol, mercury, nitrine and chlorobenzene, isothiocyanate, hexachloroethane, cyanamide compounds and sodium pentachlorophenate etc.
Urease inhibitor is a kind of organic compound that can suppress the soil urease effect, can prolong the fertilizer efficiency period of chemical fertilizer by the effect of urease inhibitor, improves nitrogen utilization efficiency, reaches that joint is fertile, the purpose of saving of labor and volume increase.A variety of organic compound all have urease inhibiting effect, and wherein from many-sided factors such as price, effect of increasing production, environmental effects, for example Resorcinol (HQ) is a urease inhibitor commonly used.
DCD (the chemical name dicyanodiamide are called Dyhard RU 100 again) is a kind of latent curing agent, promptly is slow nitrogenous fertilizer simultaneously, is again a kind of nitrification inhibitor, and can degrade with soil water reaction generates urea, harmless to soil and plant.In chemical fertilizer, add DCD, then increased the absorption solidification effect of soil colloid, can reduce the volatilization loss of ammonia ammonium ion.DCD is a kind of more satisfactory compound nitrification inhibitor, and the reaction that can make ammonium nitrogen in being manured into soil be converted into nitric nitrogen slows down, thereby reduces the loss of nitrogen in the leaching of nitric nitrogen and the soil that denitrification causes, can improve chemical fertilizer again to underground contaminated water source.Inventor of the present invention adds in the chemical fertilizer preparation controlled release chemical fertilizer to DCD and has also made detailed report (long-acting ammonium hydrogen carbonate, Chemical Industry Press, in January, 2000).But, not retrieved as yet up till now and utilized water-holding agent, nitrification inhibitor, urease inhibitor and fertilizer (particularly chemical fertilizer), preparation has the report of the composite fertilizer of long-acting water-holding performance.
The purpose of this invention is to provide a kind of composite fertilizer with long-acting water-holding effect, nitrification inhibitor, urease inhibitor are evenly distributed in nitrogen manure (for example urea or bicarbonate of ammonia) xln inside and surface in this fertilizer, water-holding agent is powdery and is coated on granule surface, and can mix nutritive element granulations such as phosphorus, potassium, trace element, and obtain a kind of novel composite fertilizer.
This composite fertilizer of the present invention combines fertile and two main volume increase factors of water closely, improves nitrogen utilization efficiency with water-holding agent, reduces the leaching and the volatilization loss of soil nutrient, interaction by two kinds of volume increase factors, can give full play to fertilizer, the production-increasing function of water, and can reduce N
2The formation amount of O and nitrite nitrogen.
Another object of the present invention provides the method for the above-mentioned composite fertilizer of preparation and the equipment that is exclusively used in the above-mentioned composite fertilizer of preparation.
To achieve these goals, long-acting water-retaining complex fertilizer of the present invention, form by fertilizer, ammonia stablizer and water-holding agent, and the weight part ratio of fertilizer, ammonia stablizer and water-holding agent is a fertilizer: 100-300 weight part, ammonia stablizer: 0.2-4 weight part, water-holding agent: 5-100 weight part.
In above-mentioned long-acting water-retaining complex fertilizer, described fertilizer is fertilizer urea, bicarbonate of ammonia, ammonium chloride, ammonium sulfate or ammonium nitrate.
In above-mentioned long-acting water-retaining complex fertilizer, described ammonia stablizer is Dyhard RU 100 DCD.
In above-mentioned long-acting water-retaining complex fertilizer, described water-holding agent is polyacrylate, polyacrylamide, starch, Mierocrystalline cellulose and chitin.
In above-mentioned long-acting water-retaining complex fertilizer, add the auxiliary fertilizer of phosphate fertilizer, potash fertilizer or trace element in the fertilizer, the addition of phosphate fertilizer, potash fertilizer or trace element is respectively the 0-15% of by weight of fertilizer, but total addition level is no more than 30%.
In above-mentioned long-acting water-retaining complex fertilizer, further add one or two or more kinds additive in magnesia unslacked, humic acid or the ferric oxide, its addition is respectively the 0-10% of by weight of fertilizer, but total addition level is no more than 15% (except the extraordinary humic acid composite fertilizer).
In above-mentioned long-acting water-retaining complex fertilizer, described humic acid is the peat composed of rotten mosses or brown coal.
In long-acting water-retaining complex fertilizer of the present invention, as fertilizer sources is fertilizer urea or bicarbonate of ammonia preferably.
Urea is the maximum a kind of nitrogen manure of world today's turnout and usage quantity, and its nitrogen content belongs to non-acid group nitrogenous fertilizer again up to 46%, and it is applicable to various soil and crop, does not harden and acidified soil.It is that a kind of amide nitrogen fertilizer must resolve into ammonium carbamate and then form bicarbonate of ammonia through the enzymolysis of soil urease, is utilized by plant with the form of ammonium nitrogen.But the urease activity of soil is very high, and generally urea can change into bicarbonate of ammonia all by enzymolysis in 7 day time.
Bicarbonate of ammonia is the exclusive nitrogenous fertilizer of China, is a nitrogen fertilizers preferably.Bicarbonate of ammonia contains 17.1% nitrogen and 56% carbonic acid gas, has the fertilizer efficiency advantages such as soil that harden soon and not; But shortcoming is also very outstanding, nitrogen utilization efficiency low (about 25%), and fertilizer efficiency period short (35-45 days) is difficult for storing (year volatilization loss amount 15%-20%), easily ties lump, makes troubles to the later stage fertilising.
Inventor of the present invention finds that by screening DCD has the ammonia stabilization function, and the structure of DCD is (NH
2-C-(NH)-NH-C=N), except cyano group has the inhibiting nitrification effect, primary amine in the DCD structure, secondary amine and free ammonia molecule have hydrogen bond association, can reduce the pH value during the ammonia volatilization and the apparent concentration of ammonia, make form, time, quantity and the crop of urea or bicarbonate of ammonia supply nitrogen support the absorption basic synchronization, therefore, the present invention claims that DCD is the ammonia stablizer.
Certainly, DCD is the nitrification inhibitor of the multinational widespread usage in the world, it promotes the formulation usage quantity is the 5-11% of nitrogen content, this addition only can play the effect of slow to nitrogenous fertilizer, the part nitrogen can not all be absorbed by crop in a crop growth period, therefore be used for high added value, famous and precious crops such as perennial grass and flowers, because of cost height difficult popularization on field crop more.But, in the present invention the content of DCD is limited in the level of the 0.2%-4% of relative nitrogenous fertilizer weight, DCD can not had a negative impact to plant-growth, and can solve nitrogen manure volatilization, leaching, nitrification and denitrification effect, improve nitrogen utilization efficiency, reduced the discharging of rate of fertilizer application and minimizing Nitrous Oxide, nitrite nitrogen and greenhouse gases.Promptly add an amount of DCD the nitrogen utilization efficiency that improves chemical fertilizer is played important effect with alleviating to the pollution of environment.
In long-acting water-retaining complex fertilizer of the present invention, can make fertilizer of the present invention adapt to Different Crop and soil regime more by adding auxiliary fertilizer.Auxiliary fertilizer for example expects that the interpolation of phosphate fertilizer, potash fertilizer or trace element all can carry out with reference to routine techniques.But in order to bring into play the effect of long-acting nitrogen fertilizer, above-mentioned every kind of auxiliary fertilizer addition preferably is no more than 15% of by weight of fertilizer for every kind, and total addition level preferably is no more than 30%.
In above-mentioned long-acting water-retaining complex fertilizer, can add magnesia unslacked.So-called magnesia unslacked is meant a kind of magnesium oxide that obtains at 800-950 ℃ of roasting magnesiumcarbonate, magnesite or magnesium hydroxide.Have the effect that prevents the composite fertilizer suction in the present invention by adding magnesia unslacked, and add a certain amount of magnesia unslacked and also help granulation of fertilizer.The addition of general magnesia unslacked is below 10% of by weight of fertilizer, and is preferably below 5%.
Ferric oxide (Fe
2O
3) also can be used as the additive of composite fertilizer of the present invention.Adding a certain amount of ferric oxide has the water conservation of raising effect, also can make the granulation color even simultaneously.The addition of ferric oxide generally should be below 10% of by weight of fertilizer, and is preferably below 5%.
Humic acids can play the effect of urease inhibitor, therefore, adds the nitrogen utilization efficiency that a certain amount of humic acids can improve fertilizer.In addition, humic acids also is the nutritive ingredient of plant-growth, and is favourable to improving crop yield.Containing a large amount of humic acid substances in the brown coal or the peat composed of rotten mosses, is active higher humic-acid kind.With brown coal powder or the peat composed of rotten mosses and fertilizer mixing granulation, higher effect of increasing production is arranged.In the present invention, the relative by weight of fertilizer of the addition of humic acids is below 10%, and is preferably below 5%.But at the extraordinary humic acid fertilizer that is used for flowers, vegetables, green food etc., the humic acid addition can be increased to 50% of relative by weight of fertilizer.
The preparation method of long-acting water-retaining complex fertilizer of the present invention comprises mechanical mixing and system's addition method.
(1). described mechanical mixing is powdery synthetic back chemical fertilizer and powdery ammonia stablizer, auxiliary fertilizer and the granulation of additive uniform mixing, adds water-holding agent and adheres to parcel back granulating.
(2). described system addition method is to add the ammonia stablizer in synthetic chemical fertilizer process, obtain the eutectic particulate of ammonia stablizer and chemical fertilizer after, sneak into the granulation that stirs of auxiliary fertilizer and additive by mechanical mixing again, add water-holding agent and adhere to granulating behind the parcel.Perhaps, directly sneak into auxiliary fertiliser granulates, the water-holding agent particle of equal particle diameter, stir, add additive again and adhere to parcel back granulating the eutectic particulate of ammonia stablizer and chemical fertilizer.
In addition, in the preparation method of above-mentioned long-acting water-retaining complex fertilizer, described adding ammonia stablizer is to add behind the dissolution with solvents ammonia stablizer with the urea soln in the flow process of urea synthesis; Be the ammonia stablizer to be dissolved in add building-up process in the ammoniacal liquor in the flow process of carbonate synthesis hydrogen ammonium, ammonium chloride, ammonium sulfate or ammonium nitrate.
Specifically, in long-acting water-retaining complex fertilizer preparation method of the present invention, be on the basis of known preparation fertilizer, can use mechanical process or system's addition method that each composition in the long-acting water-retaining complex fertilizer of the present invention is mixed (or synthetic) and makes composite fertilizer.
In order to implement above-mentioned preparation method, the long-acting water-retaining complex fertilizer that is exclusively used in of the present invention prepares feeding device, dissolving tank, deposit groove and the volume pump that equipment is increase interpolation ammonia stablizer in the equipment of synthetic chemical fertilizer, makes in the flow process of synthetic chemical fertilizer the dissolved ammonia stabiliser solution is added in the synthesis system quantitatively.Before being connected carbamide granulation for urea synthesis process aforesaid device, the urea soln of dissolved ammonia stablizer is added in the urine; Before being connected ammonia vessel for carbonate synthesis hydrogen ammonium, ammonium chloride, ammonium sulfate or ammonium nitrate process aforesaid device, the ammonia soln of dissolved ammonia stablizer is added in the ammoniacal liquor.
Specifically, the equipment that is used to prepare long-acting water-retaining complex fertilizer of the present invention is in the equipment of known preparation fertilizer, increases the specific equipment that adds various components in the composite fertilizer, particularly adds the specific equipment of ammonia stablizer DCD.
Give further instruction below by embodiment to technology of the present invention.
Embodiment 1 long-acting water-retaining complex fertilizer prepares I
Utilize mechanical mixing, getting particle diameter 2-4mm urea (100 parts), brown coal (1 part), light-burning magnesium powder (1 part), DCD (0.5 part) by weight fully stirs in disk or cylinder, evenly after granulation and the oven dry, to contain the aqueous solution spray of water-holding agent more than 3%, make granule surface moistening, add water-holding agent dry powder (30 parts) then, in disk or cylinder, adhere to parcel, obtain the composite fertilizer (I) of particle diameter 3-5mm.
Embodiment 2 long-acting water-retaining complex fertilizers prepare II
Utilize system's addition method, deliver to the deposit groove after DCD is sent into dissolving tank and ammoniacal liquor mixed dissolution by feeding device.The ammoniacal liquor that will contain a certain amount of DCD by volume pump injects in the ammonia vessel of carbonate synthesis hydrogen ammonium flow process (or before carbonating tower), carbonate synthesis hydrogen ammonium.
With the bicarbonate of ammonia that obtains and the eutectic (100 parts) of DCD, the mechanical mixing of pressing embodiment 1 again is phosphate fertilizer (calcium superphosphate) powder (5 parts), peat composed of rotten mosses powder (5 parts) uniform mixing in disk or cylinder, the granulation oven dry, become the fertile grain of particle diameter 2-4mm, to contain the aqueous solution spray granule surface of water-holding agent more than 3%, add water-holding agent dry powder (20 parts) and ferric oxide (3 parts) again, in disk or cylinder, adhere to parcel, obtain 3-5mm brown granular complex fertilizer (II).
Embodiment 3 long-acting water-retaining complex fertilizers prepare III
Press the preparation method of embodiment 1, add Repone K powder (5 parts) again, obtain composite fertilizer (III).
Embodiment 4 long-acting water-retaining complex fertilizers prepare IV
Press the preparation method of embodiment 2, with the particle diameter that obtains is the eutectic (70 parts) of 2-4mm bicarbonate of ammonia and DCD, directly sneak into Vanadium Pentoxide in FLAKES (20 parts), potassium oxide (20 parts), the water-holding agent particle (30 parts) of equal particle diameter, stir, add magnesia unslacked (3 parts), humic acid (3 parts), ferric oxide (2 parts) again, in disk or cylinder, adhere to parcel, obtain 3-5mm brown granular complex fertilizer.
Embodiment 5 long-acting water-retaining complex fertilizer application tests
Utilize the prepared composite fertilizer of embodiment 1-3 (I), (II), (III) respectively and (IV) carry out field test, and adopt once base to execute.In contrast, adopt base manure, once topdress.Total usage quantity of nitrogen and phosphorus fertilizer and potash fertilizer is identical, and field management method is identical.The test-results of different plants is listed in table 1-table 6 respectively.Table 1 long-acting water-retaining complex fertilizer is used for the juniper test of planting
Table 2 long-acting water-retaining complex fertilizer dragon spruce seedlings afforestation experiment
Table 3 long-acting water-retaining complex fertilizer Kiwifruit is transplanted test
Table 4 long-acting water-retaining complex fertilizer drought-resistant maize test-results
Table 5 long-acting water-retaining complex fertilizer winter wheat drought resisting test-results
Table 6 long-acting water-retaining complex fertilizer rice water-saving test-results
| Handle | Observe the strain number | Dead strain number | Surviving rate | Average new skill increment |
| Long-acting water-retaining complex fertilizer (I) | ??4000 | ???172 | ??95.7％ | ????34.2cm |
| Contrast | ??4000 | ??1640 | ??59.2％ | ????17.8cm |
| Handle | Surviving rate (%) | Growing height (cm) |
| Long-acting water-retaining complex fertilizer (II) | ????96 | ????92 |
| Contrast | ????64 | ????8.5 |
| Handle | Surviving rate (%) | The plant occupation rate (%) of the thick 4-6mm of stem |
| Long-acting water-retaining complex fertilizer (III) | ????91.7 | ????83.3 |
| Contrast | ????66.7 | ????50 |
| Handle | Number of times waters | The performance of emerging | Per mu yield (kg) | |
| Sowing time | Vegetative period | |||
| Long-acting water-retaining complex fertilizer (I) | 1 time | Do not water | Miao Qi, seedling are strengthened | ????380 |
| Contrast | 1 time | 3 times | The phenomenon of being short of seedling is arranged | ????350 |
| Handle | Mu spike number (ten thousand) | Grain number per spike (individual) | Thousand seed weight (g) | Volt (%) reciprocal | Output (kg) | Stimulation ratio (%) |
| Long-acting water-retaining complex fertilizer (III) | ????38.6 | ????30.6 | ????33.2 | ????65 | ????589 | ????14.8 |
| Contrast | ????37.5 | ????28.8 | ????31.8 | ????100 | ????506 | ????0 |
| Handle | Number of times waters | Per mu yield (kg) | Units increased in production (kg) | Stimulation ratio (%) |
| Long-acting water-retaining complex fertilizer (IV) | ????10 | ????954 | ????100 | ????13.01 |
| Contrast | ????20 | ????844 | ????0 | ????0 |
By the result of above-described embodiment as can be known, use long-acting water-retaining complex fertilizer of the present invention, have following advantage:
(1) fertilizer efficiency period is long, can do that base manure is disposable to be applied, and removes the operation of topdressing from, and the burst size of fertilizer efficiency and the regulation of fertilizer requirement of crop reach synchronous substantially.
(2) nitrogen utilization efficiency of fertilizer of the present invention can increase to 40%-46%, can improve 8-10 percentage point than common nitrogen, phosphorus, potassium Chemical Mixed Fertilizer.
(3) fertilizer of the present invention is waiting under nitrogen, phosphorus, the potassium dose condition, in the land for growing field crops, fruit, dredges to use on dish and the industrial crops and can increase production 10%-20%, uses on forest, flowers, lawn and can improve survival rate and increment 30%-50%.
(4) fertilizer of the present invention can reduce dose 20%-30% under identical output condition, reduces and waters water yield 30%-50%. On the crops such as wheat, paddy rice, can reduce its irrigation times.
(5) the present invention can environmental contamination reduction owing to there is water-loss reducer can reduce the direct leaching loss of nitrogen.
(6) production process of the present invention can be arranged in pairs or groups mutually with the technique of common nitrogen, phosphorus, potassium Chemical Mixed Fertilizer, and reduce cost shortens the technological transformation time, is easy to realize suitability for industrialized production.
Claims (10)
1. long-acting water-retaining complex fertilizer, it is characterized in that forming, and the weight part ratio of fertilizer, ammonia stablizer and water-holding agent is a fertilizer: 100-300 weight part, stablizer: 0.2-4 weight part, water-holding agent: 5-100 weight part by fertilizer, ammonia stablizer and water-holding agent.
2. long-acting water-retaining complex fertilizer according to claim 1 is characterized in that described fertilizer is fertilizer urea, bicarbonate of ammonia, ammonium chloride, ammonium sulfate or ammonium nitrate.
3. long-acting water-retaining complex fertilizer according to claim 1 is characterized in that described ammonia stablizer is Dyhard RU 100 DCD.
4. long-acting water-retaining complex fertilizer according to claim 1 is characterized in that described water-holding agent is polyacrylate, polyacrylamide, starch, Mierocrystalline cellulose or chitin.
5. long-acting water-retaining complex fertilizer according to claim 1 and 2, it is characterized in that adding in the fertilizer the auxiliary fertilizer of phosphate fertilizer, potash fertilizer or trace element, the addition of phosphate fertilizer, potash fertilizer or trace element is respectively the 0-15% of by weight of fertilizer, but total addition level is no more than 30%.
6. according to each described long-acting water-retaining complex fertilizer among the claim 1-5, it is characterized in that further adding one or two or more kinds additive in magnesia unslacked, humic acid or the ferric oxide, its addition is respectively the 0-10% of by weight of fertilizer, but total addition level is no more than 15% (except the extraordinary humic acid composite fertilizer).
7. long-acting water-retaining complex fertilizer according to claim 6 is characterized in that described humic acid is the peat composed of rotten mosses or brown coal.
8. the preparation method of a long-acting water-retaining complex fertilizer comprises mechanical mixing and system's addition method,
(1) described mechanical mixing is powdery synthetic back chemical fertilizer and powdery ammonia stablizer, auxiliary fertilizer and the granulation of additive uniform mixing, add water-holding agent and adhere to parcel back granulating,
(2) described system addition method is to add the ammonia stablizer in synthetic chemical fertilizer process, obtain the eutectic particulate of ammonia stablizer and chemical fertilizer after, sneak into the granulation that stirs of auxiliary fertilizer and additive by mechanical mixing again, add water-holding agent and adhere to granulating behind the parcel; Perhaps, directly sneak into auxiliary fertiliser granulates, the water-holding agent particle of equal particle diameter, stir, add additive again and adhere to parcel back granulating the eutectic particulate of ammonia stablizer and chemical fertilizer.
9. the preparation method of long-acting water-retaining complex fertilizer according to claim 8 is characterized in that described adding ammonia stablizer in the flow process of urea synthesis, is to add behind the dissolution with solvents ammonia stablizer with the urea soln; Be the ammonia stablizer to be dissolved in add building-up process in the ammoniacal liquor in the flow process of carbonate synthesis hydrogen ammonium, ammonium chloride, ammonium sulfate or ammonium nitrate.
10. equipment that is used to prepare long-acting water-retaining complex fertilizer, be in the equipment of synthetic chemical fertilizer, to increase feeding device, dissolving tank, deposit groove and the volume pump that adds the ammonia stablizer, make handle dissolving in the flow process of synthetic chemical fertilizer, the ammonia stabiliser solution adds in the synthesis system quantitatively; Before being connected carbamide granulation for urea synthesis process aforesaid device, the urea soln of dissolved ammonia stablizer is added in the urine; Before being connected ammonia vessel for carbonate synthesis hydrogen ammonium, ammonium chloride, ammonium sulfate or ammonium nitrate process aforesaid device, the ammonia soln of dissolved ammonia stablizer is added in the ammoniacal liquor.
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| CN1307127C (en) * | 2004-09-15 | 2007-03-28 | 于战虎 | Multifunctional fertilizer capable of regulating soil property |
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| CN100564480C (en) * | 2006-03-24 | 2009-12-02 | 中国科学院沈阳应用生态研究所 | A kind of soil ammonium-adding nitrogen protection element |
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| WO2009021401A1 (en) * | 2007-08-10 | 2009-02-19 | Jian Liu | Environment-friendly carbon-nano synergistic composite fertilizers |
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| CN101462911B (en) * | 2007-12-21 | 2013-06-12 | 中国科学院沈阳应用生态研究所 | Special moisture preservation compound fertilizer for maize in arid and semi-arid area and preparation thereof |
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| CN103073366B (en) * | 2011-10-26 | 2015-06-03 | 中国科学院沈阳应用生态研究所 | Long-term sustained-release compound fertilizer with long-term ammonium chloride produced with combined-soda process as nitrogen source, and preparation method thereof |
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| CN106397070A (en) * | 2016-11-24 | 2017-02-15 | 周岩 | Compound water retaining slow release fertilizer and production method thereof |
| CN107266255A (en) * | 2017-07-26 | 2017-10-20 | 中园园林股份有限公司 | A kind of afforestation high nutrition environment-protective compound fertilizer formula |
| CN112239382A (en) * | 2020-09-24 | 2021-01-19 | 中化现代农业有限公司 | Preparation of special high-tower water-retention long-acting fertilizer for improving wheat quality and application of special high-tower water-retention long-acting fertilizer in wheat topdressing |
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