Blended controlled-release fertilizer for flue-cured tobacco in southwest Hubei province, and preparation method and application thereof

Abstract

The invention discloses a blended controlled-release fertilizer for flue-cured tobacco in southwest Hubei province. The blended controlled-release fertilizer is composed of a coated nitrogen-potassiumcompound fertilizer with a controlled-release period of 50-70 days, coated urea with a controlled-release period of 30 days, a quick-acting ternary compound fertilizer, granular diammonium phosphateand granular potassium sulfate in a mass ratio of (14-28): (2.3-5.5): (33.5-41): (8-10): (23-33.5). The coated nitrogen-potassium compound fertilizer with the controlled release period of 50-70 days is prepared by the following steps: mixing urea, potassium chloride and stone powder in a mass ratio of (28-32): (58-62): (8-12) to form a raw material mixture, water vapor is introduced, and the mixture is granulated, and then is coated with polyurethane. The compound fertilizer with different release periods provided by the invention can ensure sufficient supply of nutritional ingredients of tobaccos in the early stage, the middle stage and the later stage, the quality of the tobaccos is improved, and the labor output of later topdressing is reduced; and through reasonable matching of the nutrient elements and control of the release period, unnecessary loss of the nutrient elements is reduced, the utilization rate of the fertilizer is increased, environmental pollution is reduced, and theproduction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of tobacco planting, and in particular relates to a blended controlled-release fertilizer for flue-cured tobacco in southwest Hubei, a preparation method and application thereof. Background technique [0002] With the long-term use of the land, the nutritional content of the soil will be affected. In order to make the plants grow better, it is necessary to apply corresponding fertilizers according to the nutritional status of the soil and the characteristics of the plants. Commonly used chemical fertilizers are quick-acting and instant-soluble. They can be dissolved in water and absorbed by crops when they are applied to the soil. They often have a short fertilizer effect period, too much fertilizer supply in the early stage and insufficient fertilizer supply in the later stage, and it is difficult to adapt to the different needs of crops at different growth stages. . If the amount is too large at one time,...

AI Technical Summary

Problems solved by technology

However, the use of coated fertilizers as base fertilizers and one-time application has the following disadvantages: first, the initial nutrient release of controlled-release fertilizers is slow, which is not conducive to the growth of plants with high initial nutrient requirements; Area promotion

[0004] Patent No. CN200510044515.2 discloses a special controlled-release fertilizer for tobacco, which consists of KNO3: 22%-27%, (NH4)2HPO4: 13%-16%, K2SO4: 30%-35%, (NH4 )2SO4: 1% to 3%, ordinary calcium superphosphate: 6% to 9%, organic fertilizer: 8% to 12%, binder: 4% to 8%. The nutrient elements supplemented by the controlled-release fertilizer are not suitable for areas with poor soil fertility. For areas with poor soil conditions and uneven fertility distribution, there is no general applicability, so targeted development is suitable for different areas. Controlled-release fertilizer plays an important role in increasing plant production

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