Potassium sulfate slow-release compound and mixed fertilizer and preparation method thereof

Abstract

The invention discloses a potassium sulfate slow-release compound and mixed fertilizer, which is prepared by the following raw materials in part by weight: 22 to 30 parts of urea, 0 to 20 parts of potassium nitrate, 16 to 33 parts of monoammonium phosphate, 18 to 31 parts of potassium sulphate, 8 to 12 parts of sustained-release binder and 6 to 9 parts of organic fertilizer. The potassium sulfateslow-release compound and mixed fertilizer can be produced by the prior production line of a compound and mixed fertilizer, and has the characteristics of simple production process, investment cost conservation, low production cost and contribution to popularization and application thereof in agricultural production.

Description

technical field [0001] The invention belongs to the field of fertilizer production, and relates to a potassium sulfate type slow-release compound fertilizer and a production process thereof. Background technique [0002] my country's chemical fertilizer consumption accounts for about 20-30% of the world's total chemical fertilizer consumption, ranking first in the world. The average seasonal utilization rate of chemical fertilizers in developed countries is 50-60%, while the average seasonal utilization rate of chemical fertilizers in my country is only 30-35% %. The loss and waste of a large number of nutrients not only bring huge economic losses to the society, but also cause serious environmental pollution. It is particularly important to improve fertilizer utilization efficiency, reduce fertilizer application, and save fertilization labor. Slow / controlled release fertilizer can basically synchronize with crop nutrient absorption through the regulation of nutrient release...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on organic polymer-coated controlled-release fertilizers at home and abroad has developed to a relatively high level, the process technology has become increasingly mature, the performance of nutrient controlled release is good, and the problem of high production cost has been initially solved, but it is far away from the field. The widespread application of crops still needs to further reduce production costs; the price of sulfur-coated fertilizers is low, but this process will greatly reduce the nutrient content of a large number of elements, making the total nutrients of fertilizers low; stable fertilizers such as urease inhibitors and nitrification inhibitors cannot It meets the requirements of slow and controlled release performance, and there are problems of uneven blending and inconvenient application; compared with chlorine-based fertilizers, some crops prefer potassium sulfate-type fertilizers, such as tobacco or even avoid chlorine. Potassium sulfate slow-release fertilizers suitable for the promotion of field crops have important practical significance