Slow-release fertilizer applicable to rice interplanting and preparation method thereof

Abstract

The invention discloses a slow-release fertilizer applicable to rice interplanting and a preparation method thereof. The fertilizer comprises a core fertilizer and a coated material with the weight ratio being (86-92) :(8-14). The core fertilizer is prepared from the following raw materials in parts by weight: 28 to 32 parts of coated urea, 25 to 35 parts of powdered carbon, 16 to 20 parts of calcium superphosphate, 8 to 12 parts of plant ash, 10 to 15 parts of potassium chloride and 6 to 10 parts of ammonium bicarbonate; and the coated material is prepared from the following raw materials in parts by weight: 5 to 8 parts of crylic acid, 10 to 16 parts of sodium alginate, 2 to 5 parts of humic acid, 3 to 5 parts of polyvinyl alcohol, 1 to 6 parts of zinc sulfate, 1 to 2 parts of manganese sulfate, 2 to 10 parts of ferrous sulfate, 5 to 10 parts of bentonite, 20 to 30 parts of a starch aqueous solution with the concentration being 1 to 1.6 wt%, and 15 to 20 parts of water. The slow-release fertilizer provided by the invention comprises the core fertilizer and the coated material, the double-layer structures enable a slow release effect to be more obvious, the coated urea is added into the core fertilizer, the release speed of the element nitrogen is further controlled, and nitrogen loss is avoided.

Description

technical field [0001] The invention relates to the technical field of rice planting, in particular to a slow-release fertilizer suitable for rice planting and a preparation method thereof. Background technique [0002] Rice is a crop that needs a lot of fertilizer. In order to increase rice production, a large amount of chemical fertilizers, livestock manure and unreasonable fertilization will lead to deterioration of soil physical properties, soil compaction and soil permeability reduction, increased surface runoff, and a large amount of nutrient loss. , resulting in eutrophication of water bodies. The main problems in the process of chemical fertilizer application are firstly that the amount of chemical fertilizer is large and the utilization rate is low; secondly, the application of chemical fertilizer is unreasonable; secondly, it causes environmental pollution, lowers the quality of agricultural products, and serious food safety problems, especially in high temperature...

AI Technical Summary

Problems solved by technology

The main problems in the process of chemical fertilizer application are firstly that the amount of chemical fertilizer is large and the utilization rate is low; secondly, the application of chemical fertilizer is unreasonable; secondly, it causes environmental pollution, lowers the quality of agricultural products, and serious food safety problems, especially in high temperature and rainy climate conditions, making The leaching loss of fertilizer is very serious; the third is that a large amount of lost chemical fertilizer introduces non-main nutrients to cause soil compaction, nitrate and nitrite lead to serious pollution of groundwater, decomposed ammonia gas and nitrogen dioxide generated by denitrification process. Nitrous oxide is released into the air and reacts with ozone to generate nitric oxide, causing the destruction of the ozone layer

The average utilization rate of nitrogen fertilizer in my country is 30-40%, which is 20% lower than that of foreign countries, causing direct economic losses and serious environmental pollution