High-nitrogen long-acting slow-release fertilizer for saline-alkali soil and application thereof in Hibiscus syriacus planting

Abstract

The invention provides a high-nitrogen long-acting slow-release fertilizer for saline-alkali soil, which is composed of the following components in parts by mass: 33-40 parts of maleic anhydride, 10-15 parts of citric acid, 15-22 parts of phosphorus nitrate, 10-12 parts of biochemical fulvic acid, 7-9 parts of humic acid, 1-2 parts of iron chelate, 1-3 parts of chelated zinc, 15-19 parts of ammonium sulfate, 10-15 parts of urea phosphate, 2-4 parts of urease inhibitor, 1-2 parts of zinc chloride and 1.0-1.5 parts of chitosan. The invention also provides a preparation method of the slow-release fertilizer and application of the slow-release fertilizer in Hibiscus syriacus planting. The slow-release fertilizer lowers the alkalinity of the soil to 2.1-2.4%, lowers the pH value of the soil to 7.5-7.8, enhances the water content of the soil to 24-26%, and enhances the phosphate fertilizer utilization ratio in the soil by 11-15%. The fertilizer efficiency of the slow-release fertilizer is prolonged by more than 30 days. The transplanting survival percent of Hibiscus syriacus is 95.4-96.7%.

Description

technical field [0001] The invention provides a fertilizer and its application in hibiscus planting, in particular to a saline-alkali land high-nitrogen long-acting slow-release fertilizer and its application in hibiscus planting, belonging to the technical field of soil fertilizers. Background technique [0002] Nitrogen fertilizers are easily lost after being applied to the soil. The loss methods include leaching, gas loss and fixation. The utilization rate of nitrogen fertilizers is only about 30%. Fertilizer loss not only causes waste, but also seriously pollutes the environment and reduces the quality of agricultural products. Improving the utilization rate of fertilizers has become a key issue of widespread concern. At present, the main problems in the manufacture of slow-release fertilizers are that the production cost of fertilizers is too high, the investment in equipment is large, and the added materials are not easy to degrade in the soil and cause pollution. [...

AI Technical Summary

Problems solved by technology

[0002] Nitrogen fertilizers are easily lost after being applied to the soil. The loss methods include leaching, gas loss and fixation. The utilization rate of nitrogen fertilizer is only about 30%.

Fertilizer loss not only causes waste, but also seriously pollutes the environment and reduces the quality of agricultural products

Improving the utilization rate of fertilizers has become a key issue of widespread concern. At present, the main problems in the manufacture of slow-release fertilizers are that the production cost of fertilizers is too high, the investment in equipment is large, and the added materials are not easy to degrade in the soil and cause pollution.

[0003] The existing high-nitrogen slow-release fertilizers also have deficiencies when used in saline-alkali land: (1) the effect of reducing soil alkalinity and soil pH is not good; (2) the water content in the improved soil is low; (3) nitrogen fertilizer The slow-release time is short and the amount of fertilizer is large; (4) the utilization rate of phosphorus fertilizer in the soil cannot be increased at the same time; (5) the survival rate of transplanting plants in the improved soil is not high

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