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Controlled-release fertilizer and application thereof in rice cultivation

A technology of controlled-release fertilizer and rice, which is applied in the field of controlled-release fertilizer and its application in rice cultivation, which can solve the problem of poor biodegradability of resin coating, high production cost of resin coated controlled-release fertilizer, and unreachable The effect of controlled release and other issues, to achieve the effect of low raw material cost, good nutrient release function, and improved biodegradability

Pending Publication Date: 2021-01-26
INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Resin-coated controlled-release fertilizers have a good nutrient release function. However, due to the high price of resin, the production cost of resin-coated controlled-release fertilizers is high, and it is difficult to promote the use of large-scale agricultural products.
Moreover, the biodegradability of the resin coating is not very good, which is contrary to the concept of modern agricultural green environmental protection
In addition, the resin coating is easy to crack under sunlight, which will cause the resin-coated fertilizer to leak quickly, and the effect of controlled release cannot be achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the preparation of fertilizer

[0034] Specific steps are as follows:

[0035] (1) Add sodium hydroxide to water to obtain sodium hydroxide solution; add acrylic acid to sodium hydroxide solution to obtain mixed solution A; add cornstarch, acrylamide and calcium carbonate to mixed solution A to obtain mixed solution B: Add ammonium persulfate to mixed solution B, and react at 50°C for 2 hours to obtain a reaction solution; 4.5%, 22.5%, 9.5%, 4.5%, 4.5%, 9.5% and 45% of the total mass;

[0036] (2) After preheating the fertilizer granules (urea granules in this example) with a particle size of 5mm to 90°C, spray the reaction solution prepared in step (1) onto the surface of the urea granules to obtain urea sprayed with the reaction solution Particles; drying the urea particles sprayed with the reaction solution to obtain urea particles wrapped with an inner envelope; The urea granules of the film; the quality of the inner envelope accounts for 3% of the ...

Embodiment 2

[0043] Embodiment 2: the preparation of fertilizer

[0044] Specific steps are as follows:

[0045] (1) Add sodium hydroxide to water to obtain sodium hydroxide solution; add acrylic acid to sodium hydroxide solution to obtain mixed solution A; add cornstarch, acrylamide and calcium carbonate to mixed solution A to obtain mixed solution B: Add ammonium persulfate to mixed solution B, and react at 50°C for 2 hours to obtain a reaction solution; 4.5%, 22.5%, 9.5%, 4.5%, 4.5%, 9.5% and 45% of the total mass;

[0046] (2) After preheating the fertilizer granules (urea granules in this example) with a particle size of 5mm to 90°C, spray the reaction solution prepared in step (1) onto the surface of the urea granules to obtain urea sprayed with the reaction solution Particles; drying the urea particles sprayed with the reaction solution to obtain urea particles wrapped with an inner envelope; The urea granules of the film; the quality of the inner envelope accounts for 5% of the ...

Embodiment 3

[0053] Embodiment 3: the preparation of fertilizer

[0054] Specific steps are as follows:

[0055] (1) Add sodium hydroxide to water to obtain sodium hydroxide solution; add acrylic acid to sodium hydroxide solution to obtain mixed solution A; add cornstarch, acrylamide and calcium carbonate to mixed solution A to obtain mixed solution B: Add ammonium persulfate to mixed solution B, and react at 50°C for 2 hours to obtain a reaction solution; 4.5%, 22.5%, 9.5%, 4.5%, 4.5%, 9.5% and 45% of the total mass;

[0056] (2) After preheating the fertilizer granules (urea granules in this example) with a particle size of 5mm to 90°C, spray the reaction solution prepared in step (1) onto the surface of the urea granules to obtain urea sprayed with the reaction solution Particles; drying the urea particles sprayed with the reaction solution to obtain urea particles wrapped with an inner envelope; The urea granules of the film; the quality of the inner envelope accounts for 5% of the ...

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Abstract

The invention discloses a controlled-release fertilizer and application thereof in rice cultivation, and belongs to the field of agricultural production. The invention provides a controlled-release fertilizer. The controlled-release fertilizer comprises a core material, an inner coating film and an outer coating film; the core material is a fertilizer particle; the inner coating film is hydrogel;the outer coating film is modified epoxy resin; the modified epoxy resin is obtained by mixing epoxy resin, epoxy modified silicone oil and a curing agent; according to the controlled-release fertilizer, the exterior of the fertilizer is sequentially coated with hydrogel and modified epoxy resin, and rapid leakage of the fertilizer caused by cracking of an epoxy resin outer coating film of the controlled-release fertilizer can be prevented through arrangement of the hydrogel; epoxy resin modified by epoxy modified silicone oil is used as an outer coating film; due to the modification of the epoxy modified silicone oil, the flexibility of the epoxy resin is greatly improved, so that the modified epoxy resin is not easy to crack under the irradiation of sunlight when serving as an outer coating; and in conclusion, the controlled-release fertilizer has a very good nutrient release function due to the cooperative use of the hydrogel and the modified epoxy resin.

Description

technical field [0001] The invention relates to a controlled-release fertilizer and its application in rice cultivation, belonging to the technical field of agricultural production. Background technique [0002] Controlled-release fertilizer is an advanced form of slow-release fertilizer. It mainly controls the release of nutrients through coating technology to achieve the goals of safety, long-term effect and high efficiency. It is the main direction of modern fertilizer development. The broadcast needs to wait. [0003] Resin-coated controlled-release fertilizers are one of the more common controlled-release fertilizers. According to the properties of film materials, they can be divided into two categories: thermoplastic resin-coated controlled-release fertilizers and thermosetting resin-coated controlled-release fertilizers. Among them, the thermoplastic resin-coated controlled-release fertilizer is mainly obtained by first dissolving the coated resin with a solvent, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G5/12C05G5/30C05G3/00A01C21/00A01G22/22
CPCC05G5/12C05G3/40C05G5/30C05G3/00C05C9/00A01G22/22A01C21/005
Inventor 袁嫚嫚孙义祥邬刚王家宝
Owner INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI
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