Special controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances for corn
By using flavonoid nutrient signal substances, bio-based polyurethane and CMC to encapsulate urea particles in corn-specific controlled-release nitrogen fertilizers, the problems of nutrient deficiency and soil pollution in the early stages of corn growth caused by traditional controlled-release urea are solved, achieving efficient nitrogen fertilizer utilization and corn growth promotion.
Patent Information
- Application Number
- CN202510825840.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-19
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2045-06-19
AI Technical Summary
Traditional controlled-release urea does not release enough nutrients in the early stages of corn growth, leading to nutritional deficiencies. Long-term use may lead to nitrogen accumulation in the soil, affecting soil health and the environment. Existing controlled-release nitrogen fertilizers are not designed for corn needs, which reduces the efficiency of corn nitrogen fertilizer utilization, and traditional materials may cause secondary pollution to the environment.
Flavonoid nutrient signal substances, bio-based polyurethane and sodium carboxymethyl cellulose are sprayed on the surface of urea granules to prepare a controlled-release nitrogen fertilizer specifically for corn. The fertilizer ingredients are encapsulated through a water/oil/water emulsification method to achieve slow and continuous release, stimulate root growth and the colonization of nitrogen-fixing microorganisms, and improve the utilization rate of nitrogen fertilizer.
It increased corn yield, total nitrogen and nitrogen absorption, nitrogen fertilizer utilization rate and the abundance of Paenibacillus triticisoli in the rhizosphere, reduced fertilizer loss, protected the stability and activity of flavonoid signaling substances, and met the nutrient needs of corn at different growth stages.
Smart Images
Figure CN120647453A_ABST
Abstract
Claims
1. A controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn, characterized in that: The following raw materials are included in weight fractions: 1000 parts of nitrogen fertilizer, 5-10 parts of flavonoid nutrient signal substance microcapsules, and 50-100 parts of coating material.
2. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 1, characterized in that: The flavonoid nutrient signal substance microcapsules are prepared by the following method: (1) Dissolve the flavonoid nutrient signal substance and benzoic acid in deionized water, adjust the pH to alkaline with alkali solution to obtain a signal substance solution, dissolve poly(lactic acid-co-glycolic acid) copolymer in dichloromethane to obtain a PLGA solution, slowly pour the PLGA solution into the signal substance solution, homogenize and emulsify, and then stir to obtain a water / oil emulsion; (2) dissolving polyvinyl alcohol in deionized water to obtain a polyvinyl alcohol solution, adding the polyvinyl alcohol solution to the water / oil emulsion under a constant temperature water bath, homogenizing and emulsifying, and then stirring to obtain a water / oil / water emulsion; (3) The water / oil / water emulsion is subjected to freeze centrifugation under stirring to obtain a precipitate, which is then washed and freeze-dried to obtain flavonoid nutrient signal substance microcapsules.
3. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 2, characterized in that: In step (1), the flavonoid nutrient signal substance is selected from at least one of naringenin, rutin, and apigenin; the mass ratio of the flavonoid nutrient signal substance to benzoic acid is 3:1; the pH is adjusted to 11; the mass concentration of polylactic acid-glycolic acid copolymer in the PLGA solution is 1%; the volume ratio of the signal substance solution to the PLGA solution is 1:3; the homogenization speed is 10,000 rpm; the emulsification time is 5 minutes; the stirring speed is 500 rpm and the time is 1 hour.
4. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 2, characterized in that: In step (2), the concentration of the polyvinyl alcohol solution is 10 g / L; the temperature of the constant temperature water bath is 95°C; the volume ratio of the polyvinyl alcohol solution to the water / oil emulsion is 2.5:1; the speed of the homogenizer is 10,000 rpm; the emulsification time is 5 minutes; and the stirring speed is 400 rpm and the time is 10 hours.
5. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 2, characterized in that: In step (3), the stirring speed is 10,000 rpm; the temperature of the refrigerated centrifugation is -20°C; and the freeze-drying is freeze-drying at -80°C for 10 h.
6. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 1, characterized in that: The coating material is obtained by mixing vegetable oil, isocyanate and sodium carboxymethyl cellulose in a mass ratio of 6:5:
5.
7. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 1, characterized in that: The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn is prepared by the following method: The nitrogen fertilizer is preheated, flavonoid nutrient signal substance microcapsules are added to the coating material and mixed evenly, and sprayed onto the surface of the nitrogen fertilizer several times. After solidification, a controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn is obtained.
8. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 7, characterized in that: The preheating temperature is 75° C. and the preheating time is 30 minutes; the number of spraying times is ≥ 2 times.
9. The controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances specifically for corn according to claim 7, characterized in that: The preheated hot air flow rate is 380 m 3 / min; the spraying speed is 5 g / min; and the curing time is 10 min.
10. Use of the controlled-release nitrogen fertilizer containing flavonoid nutrient signal substances for corn according to any one of claims 1 to 9 in at least one of the following 1) to 4): 1) Increase corn yield; 2) Increase total nitrogen and nitrogen uptake by corn plants; 3) Improve nitrogen fertilizer utilization efficiency; 4) Improve the corn rhizosphere Paenibacillus triticisoli relative abundance.
Citation Information
Patent Citations
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