CN103254009A - Gamma-polyglutamic acid slow-release preparation, preparation method and application thereof - Google Patents

Abstract

The invention discloses a gamma-polyglutamic acid slow-release preparation, a preparation method and an application thereof. The slow-release preparation comprises gamma-polyglutamic acid, ground phosphate rock and kieselguhr; and the weight part ratio is 1:(0-1):(0-1). The slow-release preparation has the characteristic of biodegradability; the degradable product can generate a final product glutamic acid good for the environment; and the slow-release preparation also has the characteristics of high water-absorbing quality and good release controlling capability and usability of chelating metal ions and forming an ion compound with calcium and magnesium so as to acquire better nutrition biosome; and the slow-release preparation can be applied to the production of the coated/slow controlled release fertilizer in order to solve the defect that the coated/slow controlled release fertilizer polymer residue film or thermoplastic resin is not easy to be degraded in the soil environment in the prior art.

Description

A kind of gamma-polyglutamic acid-sustained release dosage and its preparation method and application

Technical field

The present invention relates to material and sustained-controll-release fertiliser technical field, be specifically related to a kind of gamma-polyglutamic acid-sustained release dosage and its preparation method and application.

Background technology

International Standards Organization is defined as slow release fertilizer: the nutrient that exists with physics or combined form is applied to the fertilizer that its validity is prolonged; Controlled release fertilizer is defined as: fertilizer all produced effect in the whole growth phase of crop, and the nutrient in the fertilizer has microsolubility in the soil solution, and crop is in full accord to nutrient demand and nutrient releasing speed.

Define in GB/T23348-2009 " slow release fertilizer " standard: sustained-controll-release fertiliser is the chemically composited or physical action by nutrient, the chemical fertilizer that it is slowly discharged along with the time the available nutrients of crop.

The difference of slowly/controlled releasing fertilizer ammonium chemical ingredients can be categorized as it: polymerization or condensation sustained-controll-release fertiliser, parcel sustained-controll-release fertiliser, mixing sustained-controll-release fertiliser and absorption sustained-controll-release fertiliser.The difference of ammonium dissolution mechanism can be summarized as it: water soluble fertilizer, microsolubility organic or inorganic nitrogenous compound.

The use of slowly/controlled releasing fertilizer can significantly improve chemical fertilizer utilization ratio and labour productivity, is the important channel that reduces the agricultural-food production cost, also is the important means of preserving the ecological environment, and is the important leverage of agricultural sustainable development.

In the slowly/controlled releasing fertilizer of having reported, film-coated controlled release fertilizer is main product at present, and the coating agent mainly comprises inorganic coated slow release formulation, and its material comprises zeolite, diatomite, sulphur, polygorskite, kaolin etc.; Organic coated sustained release dosage comprises natural macromolecular material: Mierocrystalline cellulose, starch, xylogen, amino acid, natural rubber, sodium alginate, humic acid; Synthesized polymer material: thermoplastic polyolefin-like and thermosetting resin; Semi-synthetic macromolecular material is mainly in natural organic high-molecular material and some high molecular weight water soluble polymers or inorganic materials, has material wide material sources, cheap advantage, can degrade voluntarily in edatope.

Sulfur-coated urea is to be typical case's representative of the release and release control fertilizer of coating agent with the inorganics, according to the literature, the bag Thio Urea is the slow urea of external turnout maximum, and its main technical principle is to wrap up by pre-heated fertiliser granulates with fusion sulphur, realizes the slowly controlled of fertilizer nutrient by dressing.Its course of processing generally is the surperficial crop coating that sulphur is applied to fertiliser granulates after fusing more than 156 ℃, sprays the crack that seals on the coating with sealing agent subsequently, is that the 3rd coating prevents bonding at last.Its great advantage is that raw material and production cost are low, and the sulphur dressing has higher gas barrier to water and fertilizer, not only can make fertilizer reach the purpose of slow, and sulphur also is the fourth-largest nutritive element that crop needs simultaneously.But since the sulphur film produce, deposit and transportation in break easily, thereby greatly reduce the controllability that it discharges nutrient, life-time service is coated with the sulfur fertilizer material and also can causes soil acidification in addition.

The slow control of organic polymer coating fertilizer can overcome the above-mentioned shortcoming of inorganic coated fertilizer, the main preparation methods of such release and release control fertilizer is linear macromolecule to be dissolved in make the polymer dilute solution in the organic solvent, then it is coated in the fertiliser granulates surface, along with the volatilization macromolecular material of solvent has formed the one layer of polymeric film on the fertiliser granulates surface.Because this class fertilizer surface parcel is the polymeric membrane that one deck has the even compact of toughness, so its intensity and impact resistance improve greatly.Because the nutrient element releasing rule of polymer coating controlled release fertilizer depends primarily on nutrient by the spreading factor of polymer film, thereby can be by the composition of control coating polymer materials and the approach of structure, the releasing rule and the plant that are the release and release control fertilizer nutrient are complementary to the nutrient demand rule, but there is following shortcoming in this class release and release control fertilizer: polymer capsule material price and production cost height; The use of a large amount of organic solvents is the serious waste energy and resource not only, and person health and environment are worked the mischief; The residual film of polymkeric substance after fertilizer nutrient has discharged is difficult for degraded in soil, life-time service can cause certain pollution to soil.。

Also having with the waste plastic in the recent period is the report that main raw material prepares the waterborne polymeric fertilizer envelope agent, these technical divisions divide the shortcoming that has overcome solvent polymeric thing coated fertilizer, but because the raw material of synthetic this class coating agent depends on oil, cost is higher, polymkeric substance in the coating agent is thermoplasticity synthetic resins in addition, the residual film of polymkeric substance after nutrient discharges is difficult to degraded in soil, the pollution problem of soil is not well solved.

Gamma-polyglutamic acid-is the extracellular anionic polyamino acid that the occurring in nature microbial fermentation produces, be polymerized by a-amino acid and γ-carboxyl acyl key by D-and L-L-glutamic acid, γ-PGA is made up of about 5000 L-glutamic acid monomer usually, relative molecular mass is generally at 100KD～1000KD, it is fibrous to be straight chain, has a large amount of active higher free carboxies at the molecular chain of gamma-polyglutamic acid-.Nontoxic to human body except it; outside the advantages such as biodegradability and the environment amenable end product L-glutamic acid of its degraded generation; comprise that also it has high-hydroscopicity and water-retentivity; the good control releasability; chelated metal ions; form homo-ion complex body to obtain better nutrients biological operability with calcium and magnesium; and good anti-pathogenic activity; stimulate crop and seed growth thereof and protect it to avoid the phytopathogen influence; integrate plant nutrition; indissoluble nutrient availability in the soil is provided; adjust unique functions such as soil pH, make the application of gamma-polyglutamic acid-on agricultural have better prospect.

Gamma-polyglutamic acid-liquid fermenting productive rate obtains the gamma-polyglutamic acid-that purity does not wait through purifying technique more mostly at 20mg/L～50mg/L at present, and the highest purity reaches more than 90%.Its purifying technique comprises aspects such as ethanol sedimentation or copper sulfate precipitation, must consume a large amount of inorganic solvents, and technical process is also complicated.

Gamma-polyglutamic acid-contains a large amount of carboxyls, can with ground phosphate rock in calcium ion form inner complex, promote the release of phosphorus.Diatomite is a kind of siliceous rock, and microporosity structure is a kind of high quality filler, has that absorption property is strong, unit weight is light, and fineness is even, and pH value neutrality is nontoxic, and mixing uniformity is good.

Summary of the invention

The object of the present invention is to provide a kind of gamma-polyglutamic acid-sustained release dosage, be difficult for the degraded shortcoming with the residual film of coating slowly/controlled releasing fertilizer product polymer or thermoplastic resin in the solution prior art in edatope.

A kind of gamma-polyglutamic acid-sustained release dosage, described sustained release dosage comprises gamma-polyglutamic acid-, ground phosphate rock and silica flour, gamma-polyglutamic acid-, ground phosphate rock, diatomite, its ratio of weight and number are 1:(0～1): (0～1), wherein ground phosphate rock, diatomaceous content are not 0 simultaneously.

Gamma-polyglutamic acid-sustained release dosage provided by the present invention; has biodegradable characteristic; and also have high-hydroscopicity, a good control releasability; chelated metal ions, form homo-ion complex body to obtain better nutrients biological operability with calcium and magnesium; and good anti-pathogenic activity; stimulate crop and seed growth thereof and protect it to avoid the phytopathogen influence, integrate unique functions such as indissoluble nutrient availability, adjustment soil pH value in plant nutrition, the raising soil.This sustained release dosage can be used the production with the coating slowly/controlled releasing fertilizer.

In addition, the contriver finds in a large amount of tests back, gamma-polyglutamic acid-sustained release dosage of the present invention, the composite use of gamma-polyglutamic acid-and ground phosphate rock or diatomite, the perhaps composite use of polyglutamic acid, ground phosphate rock and diatomite, all can produce synergistic effect, gamma-polyglutamic acid-sustained release dosage of the present invention has better water solubility and slow-releasing.And gamma-polyglutamic acid-sustained release dosage of the present invention has kept the microbial metabolites that fermentation produces better without the inorganic solvent concentrated broth.

Preferably, described gamma-polyglutamic acid-, ground phosphate rock and diatomaceous ratio of weight and number are 1:(0.4～0.6): (0.5～1.0).

Preferably, gamma-polyglutamic acid-content is 10mg/kg～120mg/kg in the described gamma-polyglutamic acid-sustained release dosage; Described gamma-polyglutamic acid-molecular weight is 100KD～1000KD, and the fineness of described ground phosphate rock is 40～200 orders, and the fineness of described silica flour is 40～200 orders.Wherein, KD refers to kilodalton, is the molecular weight conventional unit.

Preferably, gamma-polyglutamic acid-content is 20mg/kg～50mg/kg in the described gamma-polyglutamic acid-sustained release dosage; Described gamma-polyglutamic acid-molecular weight is 300KD～700KD.

Another object of the present invention is to provide a kind of preparation method of gamma-polyglutamic acid-sustained release dosage.

A kind of preparation method of gamma-polyglutamic acid-sustained release dosage, described method comprises the steps:

(1) ground phosphate rock and/or diatomite are added to contain in the gamma-polyglutamic acid-fermented liquid mixes, wherein gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomaceous ratio of weight and number are 1:(0～1): (0～1), and ground phosphate rock and diatomaceous content are not 0 simultaneously;

(2) mixture that step 1 is obtained insulated and stirred 20min～60min under 60～100 ℃ of conditions again through expansion drying, obtains described gamma-polyglutamic acid-sustained release dosage.

Among the preparation method of a kind of gamma-polyglutamic acid-sustained release dosage provided by the invention, with gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomite, by 1:(0～1): the ratio of weight and number of (0～1) (wherein ground phosphate rock and diatomaceous content are not 0 simultaneously) mixes; Mixture forms the gamma-polyglutamic acid-concentrated solution, and through expansion drying, makes the gamma-polyglutamic acid-sustained release dosage through 60 ℃～100 ℃ chelatropic reactions.Do not use the inorganic solvent concentrated broth among the above-mentioned gamma-polyglutamic acid-sustained release dosage preparation method, keep the microbial metabolites that fermentation produces better, improve the product fertilizer efficiency.

Preferably, in the described step 2 mixture behind insulated and stirred 20min～60min under 60～80 ℃ of conditions, expansion drying again.

Preferably, the gamma-polyglutamic acid-in the above-mentioned steps 1, ground phosphate rock and diatomaceous ratio of weight and number are 1:(0.4～0.6): (0.5～1).

Preferably, gamma-polyglutamic acid-content is 10mg/kg～120mg/kg in the above-mentioned gamma-polyglutamic acid-sustained release dosage; Above-mentioned gamma-polyglutamic acid-molecular weight is 100KD～1000KD, and the fineness of ground phosphate rock is 40～200 orders, and the fineness of silica flour is 40～200 orders.Preferred, gamma-polyglutamic acid-content is 20mg/kg～50mg/kg in the gamma-polyglutamic acid-sustained release dosage; The gamma-polyglutamic acid-molecular weight is 300KD～700KD.

Another object of the present invention is to provide a kind of application of gamma-polyglutamic acid-sustained release dosage, the gamma-polyglutamic acid-sustained release dosage has been used for the preparation of film-coated and slow release fertilizer.

A kind of application of gamma-polyglutamic acid-sustained release dosage, described gamma-polyglutamic acid-sustained release dosage is used for the preparation of film-coated and slow release fertilizer; The preparation of described film-coated and slow release fertilizer comprises the steps:

(a) raw material urea, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, gamma-polyglutamic acid-sustained release dosage and filler are pressed (1.0～1.5): (0～1.0): (0～1.0): (0～1.0): (0.001～0.20): the ratio of weight and number of (0～1.0) mixes, heating and melting, wherein nitrogenous fertilizer, phosphate fertilizer, potash fertilizer are not 0 simultaneously, and filler is not 0;

(b) the fused solution feeding prilling granulator with step a carries out granulation, obtains compound fertilizer granules;

(c) with sulphur, kaolin and gamma-polyglutamic acid-sustained release dosage by 1:(0～0.5): the ratio of weight and number of (0.005～0.3) mixes, and 98～156 ℃ of fusions, obtains the composite sulfur dressing;

(d) the composite sulfur dressing of the molten of step c gained is sprayed onto the compound fertilizer granules surface of step b gained;

(e) with melt paraffin the compound fertilizer granules surface that steps d obtains is coated, obtain described film-coated and slow release fertilizer.

Add gamma-polyglutamic acid-sustained release dosage and urea, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer mixing congruent melting among the present invention, form the pbz polymer fertiliser granulates, the hardness of compound fertilizer granules can be improved 20%～50%.And outside the composite sulfur dressing of film-coated and slow release fertilizer of the present invention, add melt paraffin again compound fertilizer granules is coated again, further protect the sulphur dressing, make its not cracky.

And the present invention has added the film-coated and slow release fertilizer of gamma-polyglutamic acid-sustained release dosage, not only has the unique function of gamma-polyglutamic acid-sustained release dosage, and slow release effect is stable, fertilizer releasing period is long, can reduce more than 20% of fertilizer amount; It is a kind of novel film-coated and slow release fertilizer with biological anti-soil-borne disease function.

Preferably, raw material among the described step a is ammonium nitrate, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, gamma-polyglutamic acid-sustained release dosage and filler, its ratio of weight and number is (1.5～2.0): (0～1.0): (0～1.0): (0～1.0): (0.001～0.20): (0～1.0), wherein nitrogenous fertilizer, phosphate fertilizer, potash fertilizer are not 0 simultaneously, and filler is not 0.

Available ammonium nitrate replaces urea, prepares film-coated and slow release fertilizer with nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, gamma-polyglutamic acid-sustained release dosage and filler material.Preparation technology is consistent with the scheme of using urea.

Above-mentioned nitrogenous fertilizer is the nitrogenous fertilizer raw material of this area routine, and as urea, ammonium nitrate, ammonium sulfate and ammonium chloride etc., the nitrogenous fertilizer raw material can be used alone, and also can mix multiple use.

Above-mentioned phosphate fertilizer is the phosphate fertilizer raw material of this area routine, and as monoammonium phosphate, diammonium phosphate, fused(calcium magnesium)phosphate, Calcium hydrogen carbonate, double superhosphate, calcium superphosphate and Lin Suanergai etc., the phosphate fertilizer raw material can be used alone, and also can mix multiple use.

Above-mentioned potash fertilizer is the potash fertilizer raw material of this area routine, and as vitriolate of tartar, Repone K, potassium primary phosphate and saltpetre etc., the potash fertilizer raw material can be used alone, and also can mix multiple use.

Above-mentioned filler is the filler of this area routine, comprises diatomite, kaolin etc., and filler can be used alone, and also can mix multiple use.

Preferably, the consumption of composite sulfur dressing is 10%～30% of compound fertilizer granules weight in the described steps d; The consumption of paraffin is 0.5%～1.0% of compound fertilizer granules weight among the described step e.

Add moderate-element compound and trace compound when preferably, preparing fused solution among the described step a; Described moderate-element compound and trace compound are selected from one or more in calcium cpd, magnesium compound, sulphur compound, manganic compound, molybdenum compound, zn cpds, iron cpd, copper compound and the boron compound.

Preferably, the prilling granulator among the described step b is high tower prilling or melting charge slurry drum granulating device.

Preferably, the melt temperature among the step c is 121～134 ℃.

Preferably, the preparation method of described gamma-polyglutamic acid-sustained release dosage comprises the steps:

(1) ground phosphate rock and/or diatomite are added to contain in the gamma-polyglutamic acid-fermented liquid mixes, wherein gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomaceous ratio of weight and number are 1:(0～1): (0～1), and ground phosphate rock and diatomaceous content are not 0 simultaneously;

(2) mixture that step 1 is obtained insulated and stirred 20min～60min under 60～100 ℃ of conditions again through expansion drying, obtains described gamma-polyglutamic acid-sustained release dosage.

Preferably, in the above-mentioned steps 2 mixture behind insulated and stirred 20min～60min under 60～80 ℃ of conditions, expansion drying again.

Preferably, the gamma-polyglutamic acid-in the above-mentioned steps 1, ground phosphate rock and diatomaceous ratio of weight and number are 1:(0.4～0.6): (0.5～1).

Preferably, gamma-polyglutamic acid-content is 10mg/kg～120mg/kg in the above-mentioned gamma-polyglutamic acid-sustained release dosage; Above-mentioned gamma-polyglutamic acid-molecular weight is 100KD～1000KD, and the fineness of ground phosphate rock is 40～200 orders, and the fineness of silica flour is 40～200 orders.Preferred, gamma-polyglutamic acid-content is 20mg/kg～50mg/kg in the gamma-polyglutamic acid-sustained release dosage; The gamma-polyglutamic acid-molecular weight is 300KD～700KD.

Embodiment

Embodiment one

Step (one), preparation gamma-polyglutamic acid-sustained release dosage:

(1) ground phosphate rock and diatomite are added to contain in the gamma-polyglutamic acid-fermented liquid mix, wherein gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomaceous ratio of weight and number are 1:0.4:1;

(2) mixture that step 1 is obtained insulated and stirred 20min under 60 ℃ of conditions again through expansion drying, obtains described gamma-polyglutamic acid-sustained release dosage.

Step (two), preparation composite sulfur dressing: 70 parts of sulphur, 20 parts of kaolin and 10 parts of gamma-polyglutamic acid-sustained release dosages are mixed, and 134 ℃ of fusions, obtain the composite sulfur dressing;

Step (three), the preparation film-coated and slow release fertilizer:

(a) with 61 parts of urea of raw material, 12.5 parts of monoammonium phosphates, 8 parts of Repone K, 2 parts of fillers with 6 parts of gamma-polyglutamic acid-sustained release dosages mix and at 112 ℃ of heating and meltings;

(b) the fused solution feeding high tower prilling device with step a carries out granulation, obtains compound fertilizer granules;

(c) waste heat that the composite sulfur dressing of 10 parts of molten is sprayed onto step b gained is 60 ℃ compound fertilizer granules surface;

(d) the compound fertilizer granules surface that after 0.5 part of paraffin fusion step c is obtained is coated, obtain described film-coated and slow release fertilizer.

Effect: corn manure trial

In experiment, the stimulation ratio of corn is to use the corn that contains gamma-polyglutamic acid-composite fertilizer to compare with the corn yield of using conventional composite fertilizer and obtain.

Decrement 20% stimulation ratio refers to when doing control experiment, the usage quantity of composite fertilizer reduces under 20% the situation, uses the corn that contains gamma-polyglutamic acid-composite fertilizer and the corn yield of using conventional composite fertilizer and compares and obtain.

Embodiment two

Step (one), preparation gamma-polyglutamic acid-sustained release dosage:

(1) ground phosphate rock, diatomite are added to contain in the gamma-polyglutamic acid-fermented liquid mix, wherein gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomaceous ratio of weight and number are 1:0.5:0.9, and ground phosphate rock and diatomaceous content are not 0 simultaneously;

(2) mixture that step 1 is obtained insulated and stirred 40min under 60 ℃ of conditions again through expansion drying, obtains described gamma-polyglutamic acid-sustained release dosage.

Step (two), preparation composite sulfur dressing: 70 parts of sulphur, 20 parts of kaolin and 10 parts of gamma-polyglutamic acid-sustained release dosages are mixed, and 134 ℃ of fusions, obtain the composite sulfur dressing;

Step (three), the preparation film-coated and slow release fertilizer:

(a) with 26 parts of urea of raw material, 43 parts of monoammonium phosphates, 8.4 parts of Repone K, 1 part of filler with 6 parts of gamma-polyglutamic acid-sustained release dosages mix and at 112 ℃ of heating and meltings;

(b) the fused solution feeding high tower prilling device with step a carries out granulation, obtains compound fertilizer granules;

(c) waste heat that the composite sulfur dressing of 15 parts of molten is sprayed onto step b gained is 60 ℃ compound fertilizer granules surface;

(d) the compound fertilizer granules surface that after 0.6 part of paraffin fusion step c is obtained is coated, obtain described film-coated and slow release fertilizer.

Effect: wheat manure trial

Control group refers to use the wheat of conventional composite fertilizer.

Decrement 20% stimulation ratio refers to when doing control experiment, the usage quantity of composite fertilizer reduces under 20% the situation, uses the wheat that contains gamma-polyglutamic acid-composite fertilizer and the wheat yield of using conventional composite fertilizer and compares and obtain.

Embodiment three

Step (one), preparation gamma-polyglutamic acid-sustained release dosage:

(1) ground phosphate rock, diatomite are added to contain in the gamma-polyglutamic acid-fermented liquid mix, wherein gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomaceous ratio of weight and number are 1:0.6:0.8, and ground phosphate rock and diatomaceous content are not 0 simultaneously;

(2) mixture that step 1 is obtained insulated and stirred 60min under 60 ℃ of conditions again through expansion drying, obtains described gamma-polyglutamic acid-sustained release dosage.

Step (two), preparation composite sulfur dressing: 70 parts of sulphur, 20 parts of kaolin and 10 parts of gamma-polyglutamic acid-sustained release dosages are mixed, and 134 ℃ of fusions, obtain the composite sulfur dressing;

Step (three), the preparation film-coated and slow release fertilizer:

(a) with 15.4 parts of urea of raw material, 20 parts of ammonium nitrate, 11 parts of monoammonium phosphates, 25 parts of Repone K, 8 parts of fillers with 8 parts of gamma-polyglutamic acid-sustained release dosages mix and at 112 ℃ of heating and meltings;

(b) the fused solution feeding high tower prilling device with step a carries out granulation, obtains compound fertilizer granules;

(c) waste heat that the composite sulfur dressing of 12 parts of molten is sprayed onto step b gained is 60 ℃ compound fertilizer granules surface;

(d) the compound fertilizer granules surface that after 0.6 part of paraffin fusion step c is obtained is coated, obtain described film-coated and slow release fertilizer.

Raw material umber among the above embodiment is weight part.

Effect: banana manure trial

In experiment, the stimulation ratio of banana is to use the banana that contains gamma-polyglutamic acid-composite fertilizer to compare with the banana production of using conventional composite fertilizer and obtain.

From the data of embodiment 1-3, can see, the present invention has added the film-coated and slow release fertilizer of gamma-polyglutamic acid-sustained release dosage, the unique function that not only has the gamma-polyglutamic acid-sustained release dosage, and slow release effect is stable, fertilizer releasing period is long, can reduce fertilizer amount, obvious to the crop yield effect, can reduce more than 20% of fertilizer amount.

The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although used some specific terms in this specification sheets, these terms do not constitute any restriction to the present invention just for convenience of description.

Claims (10)

1. gamma-polyglutamic acid-sustained release dosage, it is characterized in that described sustained release dosage comprises gamma-polyglutamic acid-, ground phosphate rock and silica flour, gamma-polyglutamic acid-, ground phosphate rock, diatomite, its ratio of weight and number is 1:(0～1): (0～1), wherein ground phosphate rock, diatomaceous content are not 0 simultaneously.

2. gamma-polyglutamic acid-sustained release dosage according to claim 1 is characterized in that, described gamma-polyglutamic acid-, ground phosphate rock, diatomaceous ratio of weight and number are 1:(0.4～0.6): (0.5～1).

3. gamma-polyglutamic acid-sustained release dosage according to claim 1 and 2 is characterized in that, gamma-polyglutamic acid-content is 10mg/kg～120mg/kg in the described gamma-polyglutamic acid-sustained release dosage; Described gamma-polyglutamic acid-molecular weight is 100KD～1000KD, and the fineness of described ground phosphate rock is 40～200 orders, and described diatomite fineness is 40～200 orders.

4. gamma-polyglutamic acid-sustained release dosage according to claim 3 is characterized in that, gamma-polyglutamic acid-content is 20mg/kg～50mg/kg in the described gamma-polyglutamic acid-sustained release dosage; Described gamma-polyglutamic acid-molecular weight is 300KD～700KD.

5. the preparation method of gamma-polyglutamic acid-sustained release dosage as claimed in claim 1 is characterized in that, described method comprises the steps:

(1) ground phosphate rock and/or diatomite are added to contain in the gamma-polyglutamic acid-fermented liquid mixes, wherein gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomaceous ratio of weight and number are 1:(0～1): (0～1), and ground phosphate rock and diatomaceous content are not 0 simultaneously;

(2) mixture that step 1 is obtained insulated and stirred 20min～60min under 60～100 ℃ of conditions again through expansion drying, obtains described gamma-polyglutamic acid-sustained release dosage.

6. preparation method according to claim 5 is characterized in that, in the described step 2 mixture behind insulated and stirred 20min～60min under 60～80 ℃ of conditions, expansion drying again.

7. the application of gamma-polyglutamic acid-sustained release dosage as claimed in claim 1 is characterized in that, described gamma-polyglutamic acid-sustained release dosage is used for the preparation of film-coated and slow release fertilizer; The preparation of described film-coated and slow release fertilizer comprises the steps:

(a) raw material urea, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, gamma-polyglutamic acid-sustained release dosage and filler are pressed (1.0～1.5): (0～1.0): (0～1.0): (0～1.0): (0.001～0.20): the ratio of weight and number of (0～1.0) mixes, heating and melting, wherein nitrogenous fertilizer, phosphate fertilizer, potash fertilizer are not 0 simultaneously, and filler is not 0;

(b) the fused solution feeding prilling granulator with step a carries out granulation, obtains compound fertilizer granules;

(c) with sulphur, kaolin and gamma-polyglutamic acid-sustained release dosage by 1:(0～0.5): the ratio of weight and number of (0.005～0.3) mixes, and 98～156 ℃ of fusions, obtains the composite sulfur dressing;

(d) the composite sulfur dressing of the molten of step c gained is sprayed onto the compound fertilizer granules surface of step b gained;

(e) compound fertilizer granules that steps d is obtained with melt paraffin carries out the surface coating, obtains described film-coated and slow release fertilizer.

8. the application of gamma-polyglutamic acid-sustained release dosage according to claim 7, it is characterized in that, raw material among the described step a is ammonium nitrate, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, gamma-polyglutamic acid-sustained release dosage and filler, its ratio of weight and number is (1.5～2.0): (0～1.0): (0～1.0): (0～1.0): (0.001～0.20): (0～1.0), wherein nitrogenous fertilizer, phosphate fertilizer, potash fertilizer are not 0 simultaneously, and filler is not 0.

9. the application of gamma-polyglutamic acid-sustained release dosage according to claim 7 is characterized in that, the consumption of composite sulfur dressing is 10%～30% of compound fertilizer granules weight in the described steps d; The consumption of paraffin is 0.5%～1.0% of compound fertilizer granules weight among the described step e.

10. according to the application of claim 7 or 8 described gamma-polyglutamic acid-sustained release dosages, it is characterized in that the preparation method of described gamma-polyglutamic acid-sustained release dosage comprises the steps:

(1) ground phosphate rock and/or diatomite are added to contain in the gamma-polyglutamic acid-fermented liquid mixes, wherein gamma-polyglutamic acid-fermented liquid, ground phosphate rock and diatomaceous ratio of weight and number are 1:(0～1): (0～1), and ground phosphate rock and diatomaceous content are not 0 simultaneously;

(2) mixture that step 1 is obtained insulated and stirred 20min～60min under 60～100 ℃ of conditions again through expansion drying, obtains described gamma-polyglutamic acid-sustained release dosage.