Slow release fertilizer for rice planting and preparation method thereof

Abstract

The invention relates to a slow release fertilizer for rice planting. The slow release fertilizer is characterized by being prepared from compound fertilizer raw material and coating material, whereinthe compound fertilizer raw material is prepared from the following raw materials in parts by weight: straw, urea, zinc sulfate, potassium sulfate, monoammonium phosphate, monopotassium phosphate, and calcium superphosphate; the coating material is prepared from the following raw materials in parts by weight: lignin, silicon dioxide, sodium alginate, a foaming agent and an emulsifying agent. Thepreparation method comprises the following steps of uniformly spraying a coating emulsion prepared by the coating material onto the compound fertilizer raw material, drying, and cooling, so as to obtain the slow release raw material. The slow release fertilizer has the beneficial effects that (1) the releasing speed of the fertilizer is reduced, the effective utilization rate of the fertilizer isimproved, the fertilizer applying frequency is reduced, and the injury to the environment and crops due to excessive fertilizer is reduced; (2) the cost of components is lower, the manufacturing costis lower, the preparation method is simple, the excellent effect on the rice growth is realized, and the slow release fertilizer is suitable for being popularized and applied.

Description

technical field [0001] The invention relates to the field of rice planting, in particular to a slow-release fertilizer for rice planting and a preparation method thereof. Background technique [0002] Rice planting mainly includes the following steps: soil preparation → seedling cultivation → transplanting seedlings → weeding and pest control → fertilization → irrigation and drainage → harvesting. Fertilization is mainly to supplement the elements necessary for rice growth, but if it is applied too often or in large quantities, it will have the opposite effect, and most of the fertilizer will be washed away with the rain, or the fertilizer itself is released too quickly, not enough time Let the rice absorb, resulting in the absorption of fertilizer and low utilization rate. [0003] Slow release fertilizers are also called slow available fertilizers or control release fertilizers. The nutrient-containing compounds in the fertilizer are released slowly in the soil or the nu...

AI Technical Summary

Problems solved by technology

Fertilization is mainly to supplement the elements necessary for rice growth, but if it is applied too often or in large quantities, it will have the opposite effect, and most of the fertilizer will be washed away with the rain, or the fertilizer itself is released too quickly, not enough time Let the rice absorb, resulting in the absorption of fertilizer and low utilization rate