Slow/controlled-release compound fertilizer suitable for field crops

Abstract

The invention discloses a slow / controlled-release compound fertilizer suitable for field crops, which belongs to a mixed fertilizer capable of controlling the release rate of nutrient components. A preparation method for the compound fertilizer is characterized by comprising two key processes of melting granulation and tumbling coating, namely preparing internal slow-release compound fertilizer granules by melting granulation and then obtaining the slow / controlled-release compound fertilizer by irregular granule speed change and tumbling coating. The slow / controlled-release compound fertilizer comprises the following raw materials in percentage by weight: 35 to 65 percent of urea, 9 to 36 percent of monoammonium phosphate or triple superphosphate, 8 to 40 percent of potassium chloride or potassium sulfate, 1 to 38 percent of granulation accessories, 3 to 5 percent of nano chitosan modified attapulgite and 1 to 2 percent of nano chitosan coating agent. The slow / controlled-release compound fertilizer suitable to be applied to the field crops can control the release rate of the fertilizer effect according to the requirements of different stages of crop growth for nutrients, duly and properly provides the nutrients for the growth of the crops, has high utilization rate, facilitates the degrading of a coating material, and is favorable for environmental protection.

Description

technical field [0001] The invention relates to a slow-release and controlled-release compound fertilizer method suitable for field crops, and belongs to the compound fertilizer capable of controlling the release rate of nutrient components. Background technique [0002] Chemical fertilizers are widely used in large quantities and have become one of the most important means of production in agricultural production, accounting for a large share of agricultural industry costs. The water solubility of chemical fertilizers makes them dissolve, decompose, volatilize, and lose rapidly after they are applied to the soil, resulting in low nutrient utilization, and the incompatibility between the demand for nutrients of crops and the supply of nutrients by chemical fertilizers; not only waste of resources, but also agricultural The increase in cost and the pollution of water, air and soil caused by the lost chemical fertilizers pose a threat to the environment on which human beings d...

AI Technical Summary

Problems solved by technology

[0005] 1. It is impossible to control the release rate of fertilizer effect according to the demand for nutrients in different stages of crop growth, and it is impossible to provide timely and appropriate nutrients for crop growth

[0006] 2. Low utilization rate of fertilizer nutrients

[0007] 3. Failure to effectively solve the problems of fertilizer nutrient loss and environmental pollution

[0008] 4. The high tower granulation process in the prior art has single process adaptability, poor compatibility, complex process and high cost

[0009] 5. The coating material is difficult to degrade and pollutes the environment

[0010] 6. The price is high, not suitable for field crops

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