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CN-121990851-A - Foliar fertilizer based on crop SOD cultivation and preparation method thereof

CN121990851ACN 121990851 ACN121990851 ACN 121990851ACN-121990851-A

Abstract

The invention belongs to the technical field of foliar fertilizer. The invention provides a foliar fertilizer based on SOD cultivation of crops and a preparation method thereof, wherein the preparation method comprises the steps of S1, adding 17-18g of monopotassium phosphate and 1-1.1g of cross-linking agent into 9000-9500g of deionized water, performing ultrasonic dissolution to obtain a basic solution, S2, adding 1000-1010g of polyvinyl alcohol-acrylic acid polymer, 148-155g of methylol urea solution, 27-30g of N-hydroxypropyl trimethyl quaternized chitosan and 3-3.5g of sodium chloride into the basic solution obtained in S1, and stirring and mixing uniformly to obtain the foliar fertilizer. The invention can effectively improve the adhesive property of the prepared foliar fertilizer and improve the retention rate of nitrogen and phosphorus.

Inventors

  • LOU YUNSHENG
  • SHEN SHENGRONG
  • YU HAINING
  • GU YINGYING
  • ZHU ZELIN
  • HUANG YAQIN

Assignees

  • 海澳思本源生物医药集团有限公司

Dates

Publication Date
20260508
Application Date
20260228

Claims (10)

  1. 1. The preparation method of the foliar fertilizer based on crop SOD cultivation is characterized by comprising the following steps: S1, 17-18g of monopotassium phosphate and 1-1.1g of cross-linking agent are added into 9000-9500g of deionized water, and ultrasonic dissolution is carried out to obtain a basic dissolution solution; s2, adding 1000-1010g of polyvinyl alcohol-acrylic acid polymer, 148-155g of methylol urea solution, 27-30g of N-hydroxypropyl trimethyl quaternized chitosan and 3-3.5g of sodium chloride into the basic solution obtained in the step S1, and stirring and mixing uniformly to obtain the foliar fertilizer based on SOD cultivation of crops.
  2. 2. The preparation method of the foliar fertilizer based on SOD cultivation of crops according to claim 1 is characterized in that 30-32g of KOH solution with concentration of 5wt% is added into 20-22g of acrylic acid to obtain an acrylic acid solution, 10g of polyvinyl alcohol powder is dissolved into 45-55g of deionized water at 85 ℃ to obtain a polyvinyl alcohol solution, the acrylic acid solution is added into the polyvinyl alcohol solution, 0.7-0.8g of potassium persulfate is added under ice bath, and nitrogen is introduced for 5min to obtain the foliar fertilizer.
  3. 3. The method for preparing the foliar fertilizer based on SOD cultivation of crops according to claim 2, wherein the specific operation of the water bath reaction is that the reaction is carried out for 4-4.5 hours in a water bath with the temperature of 55+/-2 ℃.
  4. 4. The preparation method of the foliar fertilizer based on SOD cultivation of crops according to claim 1 is characterized in that the preparation method of the methylol urea solution comprises the steps of adding 4.0g of formaldehyde into 2.5-3g of deionized water, stirring and uniformly mixing to obtain formaldehyde solution, adjusting the pH of the formaldehyde solution to 8-9, adding 3.5-3.8g of urea, stirring until the urea is dissolved, and carrying out water bath reaction to obtain the foliar fertilizer.
  5. 5. The method for preparing foliar fertilizer based on SOD cultivation of crops according to claim 4, wherein the specific operation of the water bath reaction is that the reaction is carried out for 2-2.5h in a water bath with the temperature of 40+/-2 ℃.
  6. 6. The preparation method of the foliar fertilizer based on SOD cultivation of crops according to claim 1, wherein the preparation method of the N-hydroxypropyl trimethyl quaternized chitosan is as follows: a1, dispersing 4.8-5.2g of chitosan in 30g of deionized water, and stirring at 60 ℃ to obtain a chitosan solution; A2, adding 25-28g of 2, 3-epoxypropyl trimethyl ammonium chloride into the chitosan solution obtained in the step A1, and stirring at 60-85 ℃ for reaction for 14-16 hours to obtain a reaction product; A3, washing the reaction product obtained in the step A2 by using isopropanol, dissolving the reaction product in distilled water after precipitation, precipitating by using isopropanol, extracting for 20 hours to obtain a solid, and drying the solid to constant weight to obtain the catalyst.
  7. 7. The method for preparing foliar fertilizer based on SOD cultivation of crops according to claim 6, wherein in A1, the stirring speed is 220-300r/min, and the stirring time is 25-35min.
  8. 8. The method for preparing foliar fertilizer based on SOD cultivation of crops according to claim 6, wherein in A3, the drying temperature is 80-85 ℃.
  9. 9. The preparation method of the foliar fertilizer based on SOD cultivation of crops according to claim 1, wherein in S1, the specific operation of ultrasonic dissolution is that the ultrasonic frequency is 40-50kHZ, and the ultrasonic time is 15-20min.
  10. 10. A foliar fertilizer cultivated on the basis of SOD of crops, characterized in that it is produced by the preparation method according to any one of claims 1 to 9.

Description

Foliar fertilizer based on crop SOD cultivation and preparation method thereof Technical Field The invention belongs to the technical field of foliar fertilizer, and particularly relates to a foliar fertilizer based on SOD cultivation of crops and a preparation method thereof. Background Foliar fertilizers are receiving increasing attention because they provide the most effective means of improving nutrient deficiency, increasing crop yield and product quality. Foliar fertilisers are now an indispensable part of various agricultural industries. The main advantage of foliar fertilization is that nutrient absorption occurs directly on the leaves, all nutrients can be distributed on the leaves, which helps to avoid adverse effects of the soil fertilizer, such as phytotoxicity, soil loss, slow response and potential pollution. However, general foliar fertilizers have the problem of poor adhesion, that is, most foliar fertilizers easily slip off the surfaces of leaves due to the inherent lotus leaf effect of the surfaces of the leaves of crops and are discharged into the soil environment through rain wash, thereby causing low utilization rate and serious soil pollution. In the prior art, a polymer network structure is introduced into the foliar fertilizer, and the problem of poor adhesiveness of the conventional foliar fertilizer is solved by controlling the mass ratio of the polyvinyl alcohol to the acrylic acid, the addition amount of the cross-linking agent and the addition amount of the polyvinyl alcohol-acrylic acid polymer. When the external temperature is higher than 40 ℃, the polyvinyl alcohol-acrylic acid polymer is crosslinked to generate a water-absorbing and water-retaining network, and the network generates gel after absorbing water and swelling, so that the adhesion performance of the foliar fertilizer is improved. Compared with the traditional foliar fertilizer, the prepared foliar fertilizer has improved adhesion performance, but the retention rate of nitrogen and phosphorus is still not ideal, and the improvement is still needed. Disclosure of Invention In order to solve the problems in the background technology, the invention provides a foliar fertilizer based on crop SOD cultivation and a preparation method thereof, which can effectively improve the adhesion performance of the prepared foliar fertilizer and improve the nitrogen-phosphorus retention rate of the foliar fertilizer. In order to achieve the above object, in a first aspect, the present invention provides a method for preparing a foliar fertilizer based on SOD cultivation of crops, comprising the steps of: S1, 17-18g of monopotassium phosphate and 1-1.1g of cross-linking agent are added into 9000-9500g of deionized water, and ultrasonic dissolution is carried out to obtain a basic dissolution solution; s2, adding 1000-1010g of polyvinyl alcohol-acrylic acid polymer, 148-155g of methylol urea solution, 27-30g of N-hydroxypropyl trimethyl quaternized chitosan and 3-3.5g of sodium chloride into the basic solution obtained in the step S1, and stirring and mixing uniformly to obtain the foliar fertilizer based on SOD cultivation of crops. The preparation method of the polyvinyl alcohol-acrylic acid polymer comprises the steps of adding 30-32g of KOH solution with concentration of 5wt% into 20-22g of acrylic acid to obtain an acrylic acid solution, dissolving 10g of polyvinyl alcohol powder into 45-55g of deionized water at 85 ℃ to obtain a polyvinyl alcohol solution, adding the acrylic acid solution into the polyvinyl alcohol solution, adding 0.7-0.8g of potassium persulfate under ice bath, introducing nitrogen for 5min, and reacting in a water bath to obtain the polyvinyl alcohol-acrylic acid polymer. Further, the specific operation of the water bath reaction is that the reaction is carried out for 4 to 4.5 hours in a water bath with the temperature of 55+/-2 ℃. The preparation method of the methylol urea solution comprises the steps of adding 4.0g of formaldehyde into 2.5-3g of deionized water, stirring and uniformly mixing to obtain formaldehyde solution, adjusting the pH to 8-9, adding 3.5-3.8g of urea, stirring until the urea is dissolved, and carrying out water bath reaction to obtain the methylol urea solution. Further, the specific operation of the water bath reaction is that the reaction is carried out for 2 to 2.5 hours in a water bath with the temperature of 40+/-2 ℃. Further, the preparation method of the N-hydroxypropyl trimethyl quaternized chitosan comprises the following steps: a1, dispersing 4.8-5.2g of chitosan in 30g of deionized water, and stirring at 60 ℃ to obtain a chitosan solution; A2, adding 25-28g of 2, 3-epoxypropyl trimethyl ammonium chloride into the chitosan solution obtained in the step A1, and stirring at 60-85 ℃ for reaction for 14-16 hours to obtain a reaction product; A3, washing the reaction product obtained in the step A2 by using isopropanol, dissolving the reaction product in distilled water after p