Red-mud-based nitrogen phosphorus controlled release agent and preparation method thereof

Abstract

The invention relates to a red-mud-based nitrogen phosphorus controlled release agent. The red-mud-based nitrogen phosphorus controlled release agent comprises the following raw materials in parts by weight: 50-70 parts of red-mud-based materials, 5-12 parts of gypsum, 3-5 parts of modified starch, 15-40 parts of mixed phosphatic fertilizers and 2-5 parts of agricultural residues. The invention also provides a preparation method of the red-mud-based nitrogen phosphorus controlled release agent. According to the red-mud-based nitrogen phosphorus controlled release agent, the problem that the loss amount of soluble nitrogen and phosphorus fertilizers in the early stage of fertilization is relatively increased is solved, and the fertilizers can be continuously supplied in a long-acting mode.

Description

technical field [0001] The invention relates to the technical field of chemical fertilizers, in particular to a red mud-based nitrogen and phosphorus slow-controlled release agent and a preparation method thereof. Background technique [0002] The loss of nitrogen and phosphorus in farmland is the primary source of nitrate pollution in water bodies, especially groundwater, and the main cause of eutrophication in surface water. [0003] Feng Gu et al. used 32P tracer to study the form and availability of phosphorus in calcareous soil, and found that after water-soluble phosphorus fertilizer was applied to the soil, its availability decreased with time. Shi Chunxia et al. used the method of simulating soil column cultivation to explore the vertical movement and seepage of phosphorus in the soil layer under the condition of flooded paddy fields. The study found that the seepage of phosphorus fertilizer was relatively large at the initial stage of fertilization, and it contained...

AI Technical Summary

Problems solved by technology

Red mud has also been studied as a fertilizer component in agricultural production, but with the increase of red mud application amount and application time, its adsorption performance decreases, and the long-term and sustainable control ability is limited, and limited by the physical and chemical properties of red mud, under the existing mature technology The product dosage is very low, so the actual utilization rate of red mud in agricultural production is not high

[0008] Therefore, it is of great significance to develop a red mud-based nitrogen and phosphorus slow-release agent that can not only solve the problem of relatively large loss of soluble nitrogen and phosphorus fertilizers at the initial stage of fertilization, but also provide long-term and continuous fertilizer supply.

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