Humic acid type controlled-release nitrogen potassium fertilizer special for crops

Abstract

The invention discloses a humic acid type controlled-release nitrogen potassium fertilizer special for crops. The humic acid type controlled-release nitrogen potassium fertilizer is prepared from, byweight, 50-200 parts of polymer-coated urea, 50-200 parts of polymer sulfur coating film urea, 100-200 parts of a resin coated potash fertilizer, 200-300 parts of potassium silicon calcium magnesium humate and 300-400 parts of humic acid compound fertilizer masterbatch. The fertilizer can realize the precise controlled release of nitrogen and potassium at the same time. One-time application of thefertilizer can meet the demand of nitrogen and potassium for crops in different growth periods, and the crop yield and fertilizer utilization rate are remarkably improved. Meanwhile, the humic acid type controlled-release nitrogen potassium fertilizer contains rich humic acid and activated calcium, magnesium, silicon and other trace elements, can greatly improve the quality of crops, resist pestsand diseases, improve soil and alleviate soil acidification, salinization and hardening.

Description

technical field [0001] The invention relates to the technical field of controlled-release fertilizer production, in particular to a crop-specific humic acid-type controlled-release nitrogen and potassium fertilizer. Background technique [0002] The application of chemical fertilizers is one of the important means to increase crop production, but at present, the amount of chemical fertilizers used in my country is too large, and it is increasing year by year, with an annual growth rate of more than 5%. Taking potatoes, sweet potatoes, peanuts, garlic, ginger, onions, salvia and other underground root and tuber crops as examples, the amount of chemical fertilizer per unit area exceeds 400kg / hm 2 . According to statistics, the utilization rate of nitrogen fertilizer in our country is about 25%, the utilization rate of phosphorus fertilizer is about 15%, and the utilization rate of potassium fertilizer is about 40%. The blind use of chemical fertilizers leads to the fact that ...

AI Technical Summary

Problems solved by technology

However, there are three major problems in the use of slow-release fertilizers. One is that for underground root and tuber crops such as potatoes, sweet potatoes, peanuts, garlic, ginger, onions, and salvia miltiorrhiza, nitrogen and potassium need to be controlled. Most of them focus on controlled-release nitrogen fertilizers, and the release period is relatively simple; controlled-release potassium fertilizers are difficult to control because of the rough particle surface and difficult coating.

Second, due to the large differences in the types and periods of crops' demand for nutrients, different crops have unique requirements for nutrient distribution, controlled-release nutrient types, and controlled-release time. The agricultural application of slow and controlled-release fertilizers does not focus on crops, and it is difficult to form crop-specific fertilizers. Controlled-release fertilizers; the third is the lack of trace elements in the medium and the lack of functional substances such as growth-promoting and efficiency-enhancing substances

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