Gypsum coated slow-release fertilizer and preparation method and application thereof

A coated slow-release and gypsum technology, applied in application, layered/coated fertilizers, nitrogen fertilizers, etc., can solve the problems of volatilization, nitrogen leaching loss and denitrification loss, single function and effect, and large application amount, etc., to achieve Strong activity, improved stress resistance, and synchronous absorption of crops

Inactive Publication Date: 2020-08-11
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved: the present invention aims at the practical problems of current saline-alkali farmland soil nutrient barrenness, saline-alkali effect on nitrogen migration and conversion process and inhibition of crop absorption, and conventional fertilization causing ammonia volatilization, nitrogen leaching loss and denitrification loss, etc., and provides a A gypsum-coated slow-release fertilizer and its preparation method and application. Polysaccharides and monosilicic acid” are used as the core to provide the nutrients needed for crop growth, promote the absorption of crops, regulate the process of nitrogen nitrification and denitrification, reduce nitrogen leaching and denitrification loss, and use gypsum as the outer layer The membrane, using attapulgite as a binder, can quickly reduce soil pH and ammonia volatilization through the substitution reaction of gypsum. Gypsum itself can inhibit the nitrification process, and at the same time promote the replacement and leaching of soil salt ions; through the above comprehensive effects, the solution The existing saline-alkali soil slow-release fertilizer has the problems of single function and effect, large application amount, and high cost.

Method used

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  • Gypsum coated slow-release fertilizer and preparation method and application thereof
  • Gypsum coated slow-release fertilizer and preparation method and application thereof
  • Gypsum coated slow-release fertilizer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Severe saline-alkali obstacle cultivated land in Hetao Plain, Inner Mongolia. The soil salinity in the 0-20cm plow layer of the test plot is 3.3-9.1g / kg, the pH is 8.37-8.53, the average organic matter content is 8.45-10.96g / kg, the total nitrogen is 0.39-0.64g / kg, and the alkaline nitrogen is 29.2-41.8mg / kg, available phosphorus is 9.26-12.45mg / kg, and available potassium is 164.9-188.1mg / kg. Location: Chengni Village, Sandaoqiao Town, Hangjinhou Banner, Bayannur City, Inner Mongolia. In May 2017, soil samples of 0-20 cm from the surface layer of saline-alkali cultivated land were collected as soil for indoor constant temperature cultivation experiments. The test time was from June 2017 to September 2017 moon. Three kinds of salt gradients were selected for the test soil, the average salt content was 3.76g / kg (low), 5.49g / kg (medium) and 7.83g / kg (high), the soil was chloride ion-sulfate type saline soil, and the texture was clay loam.

[0048] The main implementat...

Embodiment 2

[0061] Jiangsu coastal mild, moderate and severe saline-alkali land. Select typical test points in three saline-alkali farmlands with different salt gradients, among which the soil salinity of mild saline-alkali test points is 1.73g / kg, the pH is 9.04, and the organic matter is 7.26g / kg; the soil salinity of moderate saline-alkali test points is 3.47g / kg , pH is 8.77, organic matter is 5.75g / kg; soil salinity in severe saline-alkali land is 5.14g / kg, pH is 8.42, organic matter is 3.98g / kg; the whole section of the soil in the test points of the three salt gradients is silt loam, and the soil bulk density of the plow layer is average 1.42 g / cm 3 . Location: Plot No. 4, Tiaobei 11 District, Tiaozini Reclamation District, Dongtai City, Jiangsu Province. The test period was from June 2018 to October 2018. Barley was planted on mild and moderate saline-alkali land, and the straw was crushed and returned to the field after harvest. The ryegrass is planted on the severe saline-alka...

Embodiment 3

[0075] Jiangsu Binhai moderate saline-alkali land, the average soil salinity of 0-20cm plow layer is 2.98g / kg, pH is 8.84, organic matter is 4.67g / kg, total nitrogen is 0.56g / kg, total phosphorus is 0.92g / kg, soil NH 4 + -N content 3.27mg / kg, NO 3 - -N content is 11.44mg / kg, the soil texture is silt loam, and the average soil bulk density of the plow layer is 1.40g / cm 3 . Location: Plot No. 2, Tiaobei 11 District, Tiaozini Reclamation District, Dongtai City, Jiangsu Province, the test period is from November 2018 to May 2019, using a plot test with an area of ​​24m 2 (4m×6m), the test crop is barley, variety Haihua No.1. The main implementation links are as follows:

[0076] (1) CK: without any nitrogen fertilizer;

[0077] (2) F: Both base fertilizer and top dressing are conventional urea;

[0078] (3) FD: Apply slow-release fertilizer as base fertilizer, the components are 45 parts of urea, 2 parts of nitrification inhibitor DMPP, 0.4 part of nitrification inhibitor C...

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Abstract

The invention discloses a gypsum coated slow-release fertilizer and a preparation method and application thereof. The fertilizer consists of an inner core and a coating layer. The inner core componentis prepared from the following components in parts by mass: 35 to 55 parts of urea, 0.2 to 0.5 part of urease inhibitor NBPT, 1 to 3 parts of nitrification inhibitor DMPP, 0.3 to 0.5 part of nitrification inhibitor CP, 0.1 to 0.2 part of stigmasterol, 0.5 to 1 part of polyglutamic acid, 5 to 10 parts of monosilicic acid, 15 to 30 parts of fulvic acid and 1.5 to 3 parts of chitosan; and the coating layer comprises the following components in parts by weight: 15-25 parts of gypsum and 4-6 parts of an adhesive. The slow-release fertilizer has the comprehensive effects of reducing salt, improvingalkali, controlling nutrient leaching loss, keeping soil storage, increasing soil retention, promoting crop absorption and the like; gypsum is used for reducing salt and improving alkali, the ureaseinhibitor, the nitrification inhibitor and the like are combined to reduce nitrogen loss, fulvic acid, polyglutamic acid, chitosan and the like are combined to improve the resistance and nutrient absorption capacity of crops, and a virtuous cycle system for reducing nitrogen nutrient loss, preserving storage and improving efficiency of the saline-alkali soil is formed.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a slow-release fertilizer for improving the utilization efficiency of chemical fertilizers in saline-alkali farmland and a preparation method and application thereof, in particular to a gypsum-coated slow-release fertilizer and a preparation method and application thereof. Background technique [0002] Soil salinization is an important obstacle to land degradation and has become a resource, agricultural and ecological issue of global concern. The total area of ​​saline-alkali land resources in my country is more than 500 million mu, accounting for nearly 5% of the country's usable land area. The control and utilization of saline soil is a realistic demand to promote the balance of cultivated land occupation and compensation in our country, ensure regional food security, and promote regional ecological construction [0003] Nitrogen is an essential ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/20C05G3/40C05G3/80C05G3/90C05G5/12C05G5/30
CPCC05C9/00C05G3/20C05G3/40C05G3/80C05G3/90C05G5/12C05G5/30C05D3/00C05D9/00C05F11/00C05F11/02Y02P60/21
Inventor 姚荣江杨劲松王相平张新谢文萍
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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