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Slow-release fertilizer special for saline alkali soil improvement and preparation method thereof

A slow-release fertilizer, saline-alkali soil technology, applied in fertilizer mixtures, applications, fertilization devices, etc., can solve the problems of low crop yield, strong soil alkalinity, soil compaction, etc., so as to reduce soil bulk density and soil alkalinity. , the effect of changing the compacted structure

Inactive Publication Date: 2014-09-17
SHANGHAI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coastal saline soil has favorable conditions such as deep soil layer, flat terrain, and suitable for mechanical farming. However, due to the existence of excessive salt and strong alkalinity, the crop yield is low, and the soil is compacted, dense, and barren.

Method used

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  • Slow-release fertilizer special for saline alkali soil improvement and preparation method thereof
  • Slow-release fertilizer special for saline alkali soil improvement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, prepare special slow-release fertilizer for saline-alkali soil improvement

[0035] Raw materials are obtained from commercially available sources.

[0036] Large granular urea 20%, slow-release coated urea 37.5%, organic granular fertilizer 12.5%, monoammonium phosphate (including

[0037] N10%, P 2 o 5 44%) 17.5%, potassium sulfate (containing K 2 O50%, including S18%) 12.5%.

[0038] (1) Coating the saline-alkali modifier on the surface of urea to make slow-release coated urea.

[0039] 240 kg of large particle urea (commercially available, containing N46%); 115 kg of solid anti-saline mineral mixture (commercially available, phosphogypsum CaSO 4 2H 2 O60kg; Zeolite SiO 2 ·Al 2 o 3 ·H 2 O50kg; zinc sulfate ZnSO 4 ·7H 2 O2.5kg; Borax Na 2 B 4 o 7 10H 2 O2.5kg mixed composition, fineness 100 mesh); liquid adhesive polyisocyanate 20 kg, application of solid-liquid reaction film-forming process:

[0040]a. Put 240 kg of large granule urea a...

Embodiment 2

[0046] Embodiment 2, prepare special slow-release fertilizer for saline-alkali soil improvement

[0047] Raw materials are obtained from commercially available sources.

[0048] Large granular urea 19%, slow-release coated urea 38%, organic granular fertilizer 13%, monoammonium phosphate (including N10%,

[0049] P 2 o 5 44%) 17%, potassium sulfate (containing K 2 O50%, including S18%) 13%.

[0050] Preparation method is the same as embodiment 1

[0051] The special slow-release fertilizer obtained for saline-alkali improvement is: organic matter content is 5.2%, macronutrient elements (N+P 2 o 5 +K 2 O) content is 35.82%, nitrogen (N) is 21.84%, phosphorus (P 2 o 5 ) 7.48%, containing potassium (K 2 O) 6.5%, ratio of three elements (N:P 2 o 5 :K 2 O) is 1:0.34:0.30, in which the slow-release nitrogen accounts for 52% of the total nitrogen fertilizer, and the salt-alkali-resistant minerals account for 30% of the slow-release nitrogen fertilizer.

Embodiment 3

[0052] Embodiment 3, prepare special slow-release fertilizer for saline-alkali soil improvement

[0053] Raw materials are obtained from commercially available sources.

[0054] Large granular urea 18%, slow-release coated urea 40%, organic granular fertilizer 12%, monoammonium phosphate (including N10%, P 2 o 5 44%) 16%, potassium sulfate (containing K 2 O50%, including S18%) 14%.

[0055] (1) Coating the saline-alkali modifier on the surface of urea to make slow-release coated urea.

[0056] 255 kg of large granular urea (commercially available, containing N46%); 120 kg of solid anti-saline mineral mixture (commercially available, phosphogypsum CaSO 4 2H 2 O60kg; Zeolite SiO 2 ·Al 2 o 3 ·H 2 O55kg; zinc sulfate ZnSO 4 ·7H 2 O2.5kg; Borax Na 2 B 4 o 7 10H 2 (2.5kg mixed composition, fineness 100 mesh); liquid adhesive polyisocyanate 25 kg, application of solid-liquid reaction film-forming process:

[0057] a. Put 255 kg of large granule urea and 6 kg of liquid...

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Abstract

The invention provides a slow-release fertilizer special for saline alkali soil improvement, and the fertilizer comprises the following components by weight: 18%-20% of large granular urea, 35%-40% of slow-release coated urea, 12%-15% of an organic granulated fertilizer, 15%-18% of monoammonium phosphate and 12%-15% of potassium sulfate. The low-release fertilizer special for saline alkali soil improvement combines nutrient slow release and salt and alkali resistance, effectively reduces alkalescence of soil, effectively increases the aggregate structure of the soil, increases fertilizer retention properties of the soil, increases soil porosity, reduces soil bulk density, changes the saline alkali soil compaction structure, creates the good soil environment for crops, is comprehensive in nutrient and lasting in fertilizer efficiency, and reduces environmental pollution caused by fertilization, the nitrogen utilization rate can reach more than 45%, the input total amount of the fertilizer can be reduced, low carbon production can be maintained, and the slow-release fertilizer is conducive to the improvement of the worsening ecological environment. The slow-release fertilizer has the advantages of simple preparation method, is suitable for industrial production, and has great application value.

Description

technical field [0001] The invention relates to agricultural fertilizers, in particular to a slow-release fertilizer, in particular to a special slow-release fertilizer for saline-alkali soil improvement and a preparation method thereof. Background technique [0002] According to reports, nearly 10% of the land in the world is covered by different types of saline-alkali soil, mainly distributed in arid and semi-arid areas (Cheng Ling. Soil improvers on cotton growth under salt stress and several salt-tolerance-related Effects of Physiological and Biochemical Indicators. 2011). Half of the existing irrigated land is threatened by secondary salinization. In the Northeast, North and Northwest of China, there are different types of saline-alkali soils. In addition, various coastal saline soils (such as coastal tidal flats) are widely distributed in the coastal areas. These types of soils themselves lack maturity and are of low quality. Due to the dual obstacles of salinization...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
Inventor 诸海焘蔡树美范洁群曹黎明李国梁
Owner SHANGHAI ACAD OF AGRI SCI
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