Preparation method for special slow-release long-acting compound fertilizer for vegetable

Abstract

The invention provides a preparation method for a special slow-release long-acting compound fertilizer for vegetable. The compound fertilizer is a mixture of a plurality of fertilizers containing substances which exert influence on nitrification of urea in soil and components with no special fertilizer efficiency and is prepared from the following raw materials by mass: 30 to 50 parts of urea, 8 to 22 parts of ammonium sulfate, 22 to 45 parts of potassium sulfate, 7 to 12 parts of a granulating agent and a proper amount of water. The preparation method for the compound fertilizer comprises the following steps: (1) preparation of a compound of a potash fertilizer and a nitrogen fertilizer; (2) preparation of mixed particles of the components of the compound fertilizer; (3) coating with stearic acid; (4) powder spreading of a modified zeolite powder material; and (5) screening, metering and quality inspection. The invention provides the preparation method for the special slow-release long-acting compound fertilizer which can improve both output and quality of vegetable, increase raphaninin in vegetable and reduce enrichment of heavy metals in vegetable and the content of nitrate in vegetable.

Description

technical field [0001] The invention is a preparation method of a slow-release long-acting compound fertilizer specially used for vegetables. It is a mixture of various fertilizers containing substances that affect the nitrification of urea in the soil and components without special fertilizer effects. Background technique [0002] Vegetables are rich in vitamins, and they consume a large amount of food in people's daily life. They are equally important to food in the human diet structure, and their output and planting area have a clear upward trend. It plays an important role in people's livelihood and national economy. The economic benefits of vegetables depend on the yield and production cost of vegetables. The high quality of vegetables is the goal that people relentlessly pursue. Effective use of limited land resources to improve the yield and quality of vegetable crops is the direction of people's efforts. [0003] Vegetables are crops that require a lot of nitroge...

AI Technical Summary

Problems solved by technology

[0009] 1. Multi-layer coating, complex production process, large investment and high production cost

[0010] 2. The coating material is difficult to degrade, and long-term use will have a negative impact on the soil; even pollute the soil and affect the quality of agricultural products

[0011] 3. Fertilizers that increase sulforaphane in vegetables, reduce the accumulation of heavy metals in vegetables, and reduce the nitrate content in vegetables have not been reported yet

[0012] 5. The preparation method of vegetable-specific slow-release long-acting compound fertilizers that can both increase vegetable yield and improve vegetable quality is rare

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