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Novel water-retaining slow-release nitrogen-phosphorus-potassium fertilizer and preparation method thereof

A slow-release nitrogen, phosphorus and potassium fertilizer technology, applied in the field of new water-retaining and slow-release nitrogen, phosphorus and potassium fertilizers and its preparation, can solve the problems of crops withering and dying, accelerated soil hardening, and inability to grow, and achieves complex preparation, simple synthesis process, The effect of improving storage capacity

Inactive Publication Date: 2020-04-10
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The lack of water resources is another problem that plagues agricultural development. Insufficient water irrigation will lead to reduced food production, and even large areas of crops will dry up and die, which in turn will lead to poor harvests for farmers and affect the stable development of the social economy.
[0004] In addition, in some areas there is a production method of flood irrigation, which will not only lead to low water resource utilization, but also promote soil salinization, accelerate soil compaction, resulting in low yield or even no growth of crops

Method used

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  • Novel water-retaining slow-release nitrogen-phosphorus-potassium fertilizer and preparation method thereof
  • Novel water-retaining slow-release nitrogen-phosphorus-potassium fertilizer and preparation method thereof
  • Novel water-retaining slow-release nitrogen-phosphorus-potassium fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of novel nitrogen phosphorus potassium fertilizer, its step is:

[0037] (1) Add 18.02g of urea, 48.65g of 37wt% formaldehyde solution in the first reaction vessel, adjust pH to 8.0 with alkaline solution, after stirring for a period of time, add 8.67g of potassium dihydrogen phosphate, heat up and continue to react for 2h, wash, Dried to finally obtain a white powdery polymer slow-release fertilizer product;

[0038] (2) Pour 10g of chitosan into the second reaction container containing isopropanol, add NaOH solution, after swelling and alkalizing for 1h, add 15g of monochloroacetic acid, continue the reaction for 1h, use absolute alcohol, deionized water Wash the product alternately, dry to constant weight, obtain carboxymethyl chitosan;

[0039] (3) add 0.36g carboxymethyl chitosan in reactor, 15ml deionized water, stir 15min under nitrogen atmosphere, add 14.4mg initiator potassium persulfate, then add 0.36g polymer slow-release fertili...

Embodiment 2

[0042] A kind of preparation method of novel nitrogen phosphorus potassium fertilizer, its step is:

[0043](1) Add 18.02g of urea, 48.65g of 37wt% formaldehyde solution in the first reaction vessel, adjust pH to 8.0 with alkaline solution, after stirring for a period of time, add 8.67g of potassium dihydrogen phosphate, heat up and continue to react for 2h, wash, Dried to finally obtain a white powdery polymer slow-release fertilizer product;

[0044] (2) Pour 10g of chitosan into the second reaction container containing isopropanol, add NaOH solution, after swelling and alkalizing for 1h, add 15g of monochloroacetic acid, continue the reaction for 1h, use absolute alcohol, deionized water Wash the product alternately, dry to constant weight, obtain carboxymethyl chitosan;

[0045] (3) add 0.36g carboxymethyl chitosan in reactor, 15ml deionized water, stir 15min under nitrogen atmosphere, add 36mg initiator potassium persulfate, then add 1.8g polymer slow-release fertilizer;...

Embodiment 3

[0048] A kind of preparation method of novel nitrogen phosphorus potassium fertilizer, its step is:

[0049] (1) Add 18.02g of urea, 48.65g of 37wt% formaldehyde solution in the first reaction vessel, adjust pH to 8.0 with alkaline solution, after stirring for a period of time, add 8.67g of potassium dihydrogen phosphate, heat up and continue to react for 2h, wash, Dried to finally obtain a white powdery polymer slow-release fertilizer product;

[0050] (2) Pour 10g of chitosan into the second reaction container containing isopropanol, add NaOH solution, after swelling and alkalizing for 1h, add 15g of monochloroacetic acid, continue the reaction for 1h, use absolute alcohol, deionized water Wash the product alternately, dry to constant weight, obtain carboxymethyl chitosan;

[0051] (3) add 1.08g carboxymethyl chitosan in reactor, 15ml deionized water, stir 15min under nitrogen atmosphere, then add 36mg initiator potassium persulfate, then add 0.36g polymer slow-release fert...

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Abstract

The invention particularly discloses a water-retaining slow-release fertilizer based on carboxymethyl chitosan and a preparation method thereof. The method relates to synthesis of a polymer slow-release fertilizer and a preparation process of a water-retaining agent. A polymer fertilizer is successfully introduced into a water-retaining agent network in a physical blending manner. A linear polymerslow-release fertilizer synthesized by taking urea, formaldehyde and monopotassium phosphate as raw materials serves as a nutrient source and is physically wound in a water-retaining agent network, and the nutrients can be diffused into soil along with moisture to provide moisture and nutrients necessary for crop growth. The fertilizer overcomes the defects of complex preparation process, high cost and the like of a double-coating coated fertilizer, has the advantages of simple preparation process and low price, and can be widely applied to desert vegetation.

Description

technical field [0001] The invention relates to the field of water-retaining slow / controlled-release fertilizers, in particular to a novel water-retaining slow-release nitrogen, phosphorus and potassium fertilizer and a preparation method thereof. Background technique [0002] At present, human beings around the world are faced with the severe challenges of population growth, decreasing arable land, and serious water pollution. Agriculture is the material condition for human survival, how to increase food production is the core issue of agricultural development. As we all know, fertilization is a commonly used and effective way to promote crop growth and significantly increase food production. According to statistics, 40-70% of nitrogen, 80-90% of phosphorus, and 50-70% of potassium in ordinary fertilizers can be lost through leaching, surface runoff, volatilization, etc. during use, which leads to extremely high fertilizer utilization by crops. The negative impact is much...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40
CPCC05B7/00C05G3/00C05C9/02
Inventor 程冬冬王晋鹏刘艳李俊银杨越超
Owner SHANDONG AGRICULTURAL UNIVERSITY
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