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CN-121990855-A - Sustained-release fertilizer containing nucleotide and preparation method thereof

CN121990855ACN 121990855 ACN121990855 ACN 121990855ACN-121990855-A

Abstract

The invention relates to the technical field of agricultural fertilizers, in particular to a slow-release fertilizer containing nucleotide and a preparation method thereof, wherein the preparation method of the slow-release fertilizer containing nucleotide comprises the following steps of mixing and stirring 30-40 parts of urea, 10-12 parts of potassium sulfate, 5-10 parts of triple superphosphate, 10-15 parts of potassium nitrate, 10-20 parts of diammonium phosphate, 5-8 parts of fertilizer efficiency enhancer, 1-3 parts of amino acid and 2-4 parts of trace elements for 20-30min, grinding the obtained mixed materials after stirring, sieving the mixed materials by a sieve of 50-80 meshes, adding 3-8 parts of polyvinyl alcohol, stirring for 20-30min, and granulating to obtain the slow-release fertilizer containing nucleotide.

Inventors

  • LU CHANGQING
  • LU CHANGMING

Assignees

  • 梅河口市阜康化肥有限公司

Dates

Publication Date
20260508
Application Date
20260206

Claims (10)

  1. 1. A preparation method of a slow-release fertilizer containing nucleotide is characterized by comprising the following steps of mixing and stirring 30-40 parts of urea, 10-12 parts of potassium sulfate, 5-10 parts of triple superphosphate, 10-15 parts of potassium nitrate, 10-20 parts of diammonium phosphate, 5-8 parts of fertilizer efficiency enhancer, 1-3 parts of amino acid and 2-4 parts of trace elements for 20-30min according to parts by weight, grinding the obtained mixture after stirring, sieving the mixture with a 50-80 mesh sieve, adding 3-8 parts of polyvinyl alcohol, stirring for 20-30min, and granulating to obtain the slow-release fertilizer containing nucleotide.
  2. 2. The method for preparing a slow release fertilizer containing nucleotide according to claim 1, wherein the method for preparing the fertilizer efficiency enhancer comprises the following steps: Uniformly dispersing beta-cyclodextrin into an ethanol water solution with the weight percentage of 85-90% according to the mass ratio of 1:10-15, adding 3-aminopropyl triethoxysilane with the weight percentage of 0.3-0.5 times that of the beta-cyclodextrin, uniformly mixing, regulating the pH value of a reaction system to 4.5-5.5, reacting for 3-4 hours at 50-60 ℃, and filtering, washing and drying to obtain modified cyclodextrin; Uniformly dispersing the functionalized zeolite powder in N, N-dimethylformamide according to the dosage ratio of 20-40g/L, adding modified cyclodextrin, dicyclohexylcarbodiimide and 4-dimethylaminopyridine while stirring, reacting for 15-25 hours at 35-45 ℃, sequentially filtering, washing and vacuum drying the reaction liquid, soaking the obtained solid material in a nucleotide aqueous solution with the mass of 4-6 times and the concentration of 30-40g/L for 10-20 hours, filtering and drying, wherein the mass ratio of the functionalized zeolite powder to the modified cyclodextrin to the dicyclohexylcarbodiimide to the 4-dimethylaminopyridine is 2-4:1:5-10:0.5-1.5.
  3. 3. The method for preparing the slow-release fertilizer containing the nucleotide according to claim 2, which is characterized in that the functionalized zeolite powder is prepared by uniformly dispersing a silane coupling agent in N, N-dimethylformamide according to the dosage ratio of 20-30g/L, then adding succinic anhydride with the mass being 1.5-2 times that of the silane coupling agent, mixing and stirring for 3-4 hours, adding modified zeolite powder with the mass being 3-5 times that of succinic anhydride and deionized water with the volume being 15-25% of N, N-dimethylformamide, continuously stirring for 4-6 hours, centrifuging, washing the obtained solid material by ethanol and deionized water alternately for 2-3 times, and then carrying out vacuum drying.
  4. 4. The method for preparing a slow-release fertilizer containing nucleotide according to claim 3, wherein the silane coupling agent is any one of 3-aminopropyl triethoxysilane, 3-aminopropyl trimethoxysilane and N- (beta-aminoethyl) -gamma-aminopropyl triethoxysilane.
  5. 5. The method for preparing a slow release fertilizer containing nucleotide according to claim 3, wherein the modified zeolite powder is prepared by uniformly dispersing pretreated zeolite powder in an ethanol water solution with the mass of 20-30 times and the concentration of 40-60wt%, then dripping tetraethyl orthosilicate solution with the mass of 0.5-0.8 times of pretreated zeolite powder, adjusting the pH of a reaction system to 9-11, magnetically stirring for 3-5h at normal temperature in a closed state, and sequentially carrying out centrifugal separation, water washing, drying and grinding treatment on the reaction solution, wherein the mass ratio of tetraethyl orthosilicate, ethanol and water in the tetraethyl orthosilicate solution is 3-5:20-30:5-10, and the pH of the tetraethyl orthosilicate solution is 3.5-4.
  6. 6. The method for preparing a slow release fertilizer containing nucleotide according to claim 5, wherein the pretreated zeolite powder is prepared by washing zeolite powder with 100-200 meshes of particle size with deionized water, centrifuging at 2000-4000r/min for 10-20min, repeating the washing for 3-5 times, and drying and grinding.
  7. 7. The method for preparing a slow-release fertilizer containing nucleotide according to claim 1, wherein the amino acid is any one of glutamic acid, aspartic acid, threonine and arginine.
  8. 8. The method for preparing a slow-release fertilizer containing nucleotide according to claim 1, wherein the trace element is any one of EDTA-Fe, EDTA-Mn, EDTA-Zn and EDTA-Cu.
  9. 9. The method for preparing a slow-release fertilizer containing nucleotide according to claim 2, wherein the nucleotide is any one of 5' -guanosine monophosphate disodium salt, 5' -adenine nucleotide disodium salt and 5' -cytosine nucleoside monophosphate disodium salt.
  10. 10. A slow release fertilizer containing nucleotide, which is prepared by the preparation method of any one of claims 1-9.

Description

Sustained-release fertilizer containing nucleotide and preparation method thereof Technical Field The invention relates to the technical field of agricultural fertilizers, in particular to a slow-release fertilizer containing nucleotide and a preparation method thereof. Background The fertilizer is an important material basis for guaranteeing grain safety, but the conventional compound fertilizer has the advantages of quick nutrient release, low utilization rate and easiness in resource waste and environmental pollution. The slow-release fertilizer delays nutrient release through physical or chemical means and is an important way for improving the utilization rate of the fertilizer. At present, the slow release technology is mainly focused on the controlled release of major elements such as nitrogen, phosphorus, potassium and the like, and the stability and slow release research of bioactive substances (such as amino acid, humic acid, alginic acid and the like) with important regulation effect on plant growth are relatively few. The nucleotide is used as an important bioactive substance, participates in various physiological and biochemical processes in plants, and can promote root system development, enhance photosynthesis, improve crop stress resistance and improve quality. However, the nucleotide has small molecular weight and extremely strong water solubility, is extremely easy to be quickly decomposed by microorganisms or leached away with water after being directly applied to soil, is difficult to exert lasting efficacy in the growth period of crops, and limits the application of the nucleotide in actual agricultural production. How to stably load the nucleotide in a fertilizer system becomes a key problem for improving the technological content and the functionality of the fertilizer. In the prior art, although the simple mixing of the active substances and the fertilizer or the physical adsorption of the active substances and the fertilizer are attempted to be carried on porous materials (such as zeolite and bentonite), the problems of weak binding force, low loading capacity, uncontrollable release and the like generally exist, the active substances are rapidly invalid after being released in a large amount in a short period, and long-acting stimulation cannot be realized. In summary, the invention provides a slow release fertilizer containing nucleotide and a preparation method thereof, so as to solve the technical problems. Disclosure of Invention The invention aims to provide a slow-release fertilizer containing nucleotide and a preparation method thereof, and the slow-release fertilizer prepared by the method can not only provide rich nutrients for crops and promote the growth of the crops, but also improve the drought tolerance of the crops and meet the comprehensive nutrition requirements of the crops in different growth periods, and the fertilizer efficiency enhancer can effectively prevent the rapid loss and degradation of the nucleotide and realize the long-term synergy of chemical nutrition and biological stimulation. In order to achieve the above purpose, the present invention provides the following technical solutions: According to the first aspect, the invention provides a preparation method of a slow-release fertilizer containing nucleotide, which comprises the following steps of mixing and stirring 30-40 parts of urea, 10-12 parts of potassium sulfate, 5-10 parts of triple superphosphate, 10-15 parts of potassium nitrate, 10-20 parts of diammonium phosphate, 5-8 parts of fertilizer efficiency enhancer, 1-3 parts of amino acid and 2-4 parts of trace elements for 20-30min, grinding the obtained mixture after stirring, sieving the mixture with a 50-80 mesh sieve, adding 3-8 parts of polyvinyl alcohol, stirring for 20-30min, and granulating to obtain the slow-release fertilizer containing nucleotide. Further, the preparation method of the fertilizer efficiency enhancer comprises the following steps: Uniformly dispersing beta-cyclodextrin into an ethanol water solution with the weight percentage of 85-90% according to the mass ratio of 1:10-15, adding 3-aminopropyl triethoxysilane with the weight percentage of 0.3-0.5 times that of the beta-cyclodextrin, uniformly mixing, regulating the pH value of a reaction system to 4.5-5.5, reacting for 3-4 hours at 50-60 ℃, and filtering, washing and drying to obtain modified cyclodextrin; Uniformly dispersing the functionalized zeolite powder in N, N-dimethylformamide according to the dosage ratio of 20-40g/L, adding modified cyclodextrin, dicyclohexylcarbodiimide and 4-dimethylaminopyridine while stirring, reacting for 15-25 hours at 35-45 ℃, sequentially filtering, washing and vacuum drying the reaction liquid, soaking the obtained solid material in a nucleotide aqueous solution with the mass of 4-6 times and the concentration of 30-40g/L for 10-20 hours, filtering and drying, wherein the mass ratio of the functionalized zeolite powder to the modi