Efficient controlled-release fertilizer applicable to saline-alkali soil and preparation method thereof

Abstract

The invention relates to the technical field of controlled-release fertilizer and in particular relates to efficient controlled-release fertilizer applicable to saline-alkali soil and a preparation method thereof. The controlled-release fertilizer is prepared from the following raw materials in parts by mass: 10 to 15 parts of urea, 12 to 20 parts of potassium dihydrogen phosphate, 25 to 35 partsof tannic acid, 15 to 20 parts of ammonium humate, 20 to 35 parts of composted livestock manure, 100 to 120 parts of straw ash, 5 to 10 parts of a starch-based composite film, 5 to 12 parts of PAM (Polyacrylamide) and 20 to 25 parts of element fertilizer. The preparation method comprises the following steps: after sufficiently and uniformly mixing the urea, the ammonium humate, the potassium dihydrogen phosphate, the tannic acid, and the element fertilizer, drying and granulating; after cooling, carrying out enveloping treatment with the starch-based composite film; then mixing with the composted livestock manure, the straw ash and the PAM, which are sufficiently fermented, so as to obtain the efficient controlled-release fertilizer. According to the efficient controlled-release fertilizer, salt reduction and alkali reduction can be effectively carried out on the applied saline-alkali soil under the condition that microelements, necessary for growth and development of plants, are ensured to be contained. The problems of poor controlled-release function, low efficiency and the like of common fertilizer are solved; the fertilizer is not remained in the soil and the effect of effectively improving the saline-alkali soil can be realized.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to a high-efficiency controlled-release fertilizer suitable for saline-alkali soil and a preparation method thereof. Background technique [0002] Saline-alkali soil is a type of salt accumulation, which means that the salt contained in the soil affects the normal growth of crops. All kinds of saline-alkali soils are formed under certain natural conditions. The essence of their formation is mainly the redistribution of various soluble salts in the horizontal and vertical directions on the ground, so that the salt gradually accumulates on the soil surface in the salt-gathering area. build up. Saline-alkali soil is a general term for saline soil and alkaline soil. Saline soil mainly refers to salinized soil with high chloride or sulfate content. The soil is alkaline, but the pH value is not necessarily high. Alkaline soil refers to soil containing carbonate or heavy phosphate, ...

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Problems solved by technology

[0004] Aiming at the above problems in the improvement of saline-alkali soil, the present invention provides a high-efficiency controlled-release fertilizer suitable for saline-alkali soil and a preparation method thereof. Under the nutrient conditions necessary for growth, it can effectively reduce salt and alkali in saline-alkaline soil, and solve the problem of accumulation of harmful salt root ions in the soil caused by general controlled-release fertilizers, and the coating of controlled-release fertilizers cannot be effectively degraded, resulting in poor controlled-release functionality , and there will be residual problems in the soil after degradation

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