Preparation method for special slow-release long-acting compound fertilizer for paddy rice

Abstract

The invention provides a preparation method for a special slow-release long-acting compound fertilizer for paddy rice. The compound fertilizer is a mixture of a plurality of fertilizers and components with no special fertilizer efficiency. The compound fertilizer granules are as fertilizer core and processed by coating and dusting powder; the compound fertilizer granules are characterized by being prepared from the following raw materials by mass: 25 to 45 parts of urea, 8 to 25 parts of ammonium chloride, 20 to 35 parts of potassium chloride, 20 to 35 parts of a mixed phosphate fertilizer, 7 to 11 parts of a granulating auxiliary 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 the mixed phosphate fertilizer; (3) preparation of mixed particles of the components of the compound fertilizer; (4) coating with stearic acid; (5) powder spreading of a modified zeolite powder material; and (6) screening, metering, quality inspection and packaging of qualified fertilizer. The invention provides the preparation method for the special slow-release long-acting compound fertilizer which has overall nutrients and excellent slow releasing performance, enables fertilizer effectiveness to be maximumly performed, improves both output and quality of paddy rice and has low manufacturing cost.

Description

technical field [0001] The invention relates to a preparation method of a special slow-release long-acting compound fertilizer for rice. It is a mixture of various fertilizers and components without special fertilizer effects. Background technique [0002] Rice is an important food crop and economic crop. According to statistics, its output and planting area rank first in the world. It plays an important role in people's livelihood and national economy. Effective use of limited land resources to improve the yield and quality of rice crops is the direction and eternal subject of people's efforts. [0003] The growth and development of rice needs to absorb more than 20 kinds of nutrients, mainly including nitrogen, phosphorus and potassium, three macroelements; sulfur, calcium, magnesium, silicon and other macroelements, and boron and copper. Trace elements such as zinc and molybdenum. These nutrients mainly come from fertilizers provided through the soil. [0004] Compou...

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Problems solved by technology

[0007] However, the nutrient utilization rate of chlorine-based compound fertilizers in the prior art is only 25%-35%, and the utilization rate of nitrogen fertilizer is less than 30%, the loss is particularly serious, and it leads to soil pollution and air pollution.

[0015] 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

[0016] 3. The ratio of the main nutrient elements in the fertilizer is not reasonable, and the utilization rate of the fertilizer is low

[0017] 4. Low utilization rate of fertilizer, waste of resources and pollution of the environment

[0018] 5. The cost of manufacturing sulfur-based compound fertilizers is high, resulting in high fertilizer prices and increasing the economic burden on farmers

[0019] 6. The preparation method of slow-release long-acting compound fertilizer dedicated to rice is rare

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