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Photosensitive water-retaining slow-release fertilizer with nuclear membrane structure and preparation method thereof

A technology of slow-release fertilizers and photosensitivity, applied in fertilizer mixtures, layered/coated fertilizers, fertilization devices, etc., can solve problems such as soil water holding capacity and temperature that are rarely concerned, and achieve improved soil water holding rate and water retention Performance, the effect of reducing non-point source pollution

Active Publication Date: 2021-12-28
MICROBIOLOGY INST OF SHAANXI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research on various slow-release fertilizers focuses on how to slowly release nutrients, and pays little attention to the water holding capacity and temperature of the soil. However, soil moisture and temperature are precisely the important factors affecting crop growth, but few of these factors are currently considered. Research on Slow-release Fertilizers

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  • Photosensitive water-retaining slow-release fertilizer with nuclear membrane structure and preparation method thereof
  • Photosensitive water-retaining slow-release fertilizer with nuclear membrane structure and preparation method thereof
  • Photosensitive water-retaining slow-release fertilizer with nuclear membrane structure and preparation method thereof

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preparation example Construction

[0033] In order to overcome the defects that the utilization rate of traditional chemical fertilizers is not high and that slow-release chemical fertilizers are not conducive to soil water retention and heat preservation, the present invention mixes oxidized starch hydrogel and sodium alginate solution, adds chemical fertilizers to form a water-retaining slow-release core material, and then adds it as a photosensitive outer core material. The polydopamine solution of the membrane material prepares a slow-release fertilizer with a nuclear membrane structure, and the obtained slow-release fertilizer has multiple characteristics of photosensitivity, water retention and slow release. The preparation method specifically comprises the following steps:

[0034] Step 1: After gelatinizing the starch, adding an oxidation reaction solution, the obtained product is purified by precipitation to obtain oxidized starch hydrogel.

[0035] The oxidation reaction solution can oxidize and modif...

Embodiment 1

[0044] The preparation method of the photosensitivity water-retaining slow-release fertilizer with nuclear membrane structure specifically comprises the following steps:

[0045] Step 1: After gelatinizing the starch, adding an oxidation reaction solution, the obtained product is purified by precipitation to obtain oxidized starch hydrogel. The oxidation reaction solution is KMnO 4 with NaHSO 4 mixed solution; starch and KMnO in the mixed solution 4 with NaHSO 4 The mass ratio is 10:1:3.

[0046] Step 2: Mix the oxidized starch hydrogel obtained in Step 1 with sodium alginate solution, add chemical fertilizer into the mixture and completely dissolve it to obtain the water-retaining slow-release core material. The mass ratio of the sodium alginate in the sodium alginate solution to the starch in step 1 is 1:1, and the mass ratio of the chemical fertilizer to the sodium alginate in the sodium alginate solution is 5:1.

[0047] Step 3: Spray the water-retaining slow-release ...

Embodiment 2

[0050] The preparation method of the photosensitivity water-retaining slow-release fertilizer with nuclear membrane structure specifically comprises the following steps:

[0051] Step 1: After gelatinizing the starch, adding an oxidation reaction solution, the obtained product is purified by precipitation to obtain oxidized starch hydrogel. The oxidation reaction solution is KMnO 4 with NaHSO 4 mixed solution; starch and KMnO in the mixed solution 4 with NaHSO 4 The mass ratio is 25:1:2.

[0052] Step 2: Mix the oxidized starch hydrogel obtained in Step 1 with sodium alginate solution, add chemical fertilizer into the mixture and completely dissolve it to obtain the water-retaining slow-release core material. The mass ratio of the sodium alginate in the sodium alginate solution to the starch in step 1 is 5:1, and the mass ratio of the fertilizer to the sodium alginate in the sodium alginate solution is 2.5:1.

[0053] Step 3: Spray the water-retaining slow-release core ma...

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Abstract

The invention relates to a photosensitive water-retaining slow-release fertilizer with a nuclear membrane structure and a preparation method thereof. Traditional chemical fertilizers generally have the problem of low utilization rate, and slow-release chemical fertilizers have the defect that water retention and heat preservation of soil are not facilitated. The preparation method comprises the following steps: mixing oxidized starch hydrogel and a sodium alginate solution, and adding a chemical fertilizer to form a water-retaining slow-release core material; and then adding a polydopamine solution serving as a photosensitive outer membrane material to obtain the photosensitive water-retaining slow-release fertilizer. According to the invention, a fertilizer core with water retention and slow release properties is synthesized through cross-linking, and a fertilizer outer membrane containing a photosensitive material is synthesized through ionic interaction, so that the obtained slow release fertilizer has an obvious nuclear membrane structure and excellent slow release property, the utilization rate is obviously increased, the water retention rate of soil can be effectively increased, the temperature of the soil is increased, and the crop growth is further promoted; and non-toxic and easily degradable materials are adopted, so that non-point source pollution caused by fertilizer loss can be reduced, environmental pollution is reduced, and the soil structure is protected.

Description

technical field [0001] The invention relates to a novel fertilizer, in particular to a photosensitive water-retaining slow-release fertilizer with a nuclear membrane structure and a preparation method thereof. Background technique [0002] The utilization rate of chemical fertilizers in my country is not high (30-40%), and its large-scale application will destroy the soil structure of cultivated land, resulting in soil compaction and poor water retention. In addition, due to the rapid penetration of nutrients, plants cannot absorb all nutrients, causing most of the elements to accumulate or leach into groundwater, resulting in eutrophication of water bodies and causing serious agricultural non-point source pollution problems. [0003] Slow-release fertilizers are an important means to solve the above technical problems and become an important method to improve the utilization rate of chemical fertilizers. Since the early coating materials of slow-release fertilizers are dif...

Claims

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Application Information

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IPC IPC(8): C05G5/30C05G3/40C05G3/80
CPCC05G5/37C05G3/40C05G3/80
Inventor 李燕戴佳锟
Owner MICROBIOLOGY INST OF SHAANXI