Controlled-released fertilizer preparation method and commercial crop controlled-released fertilizer prepared according to controlled-released fertilizer preparation method

Abstract

The invention discloses a controlled-released fertilizer preparation method and a commercial crop controlled-released fertilizer prepared according to the controlled-released fertilizer preparation method. The method includes steps: adding papermaking black liquid into sodium tripolyphosphate caustic sludge, adding bagasse, fishpond sludge, gibberellin fungus residues, an overground part of Sophora Flavescens, Ilex Chinensis Sims, Artemisia Vulgaris and mixed bacteria to realize fermentation, adding seaweed gel residues, coal cinders, bamboo charcoal, diammonium phosphate and a binding agent into a fermentation product, and granulating to obtain particles 1; granulating triple superphosphate, urea and potassium chloride to obtain particles 2; adding leaves of musa basjoo, Radix glycyrrhizae, Fructus Psoraleae and Radix Tripterygii wilfordii into water, decocting, and adding ureaformaldehyde into decoction to obtain coating liquid; coating the particles 1 and the particles 2 with the coating liquid to obtain the controlled-released fertilizer. The controlled-released fertilizer is high in phosphorus content and can be used for various crops, vegetables, fruits and the like high in phosphorus demand. By separate granulation of the raw materials, nutritional ingredients can be released at different stages, the fertilizer is approximately released by 60% in an early stage and 40% in a later stage, and accordingly growth requirements of crops can be met in a whole growing period.

Description

technical field [0001] The invention relates to a preparation method of a slow and controlled release fertilizer and the prepared slow and controlled release fertilizer for economic crops, belonging to the technical field of compound fertilizers. Background technique [0002] Fertilizer is the most important agrochemical. It provides nutrients for plants, promotes the growth of crops, and increases crop yields. With the increase of the world's population, agricultural production has also increased rapidly, and people have put forward higher requirements for the yield per mu of crops, which has further increased the amount of chemical fertilizers. However, in recent years, the extensive use of chemical fertilizers has also brought great disadvantages. For example, the utilization rate of chemical fertilizers in China is not high, the utilization rate of nitrogen fertilizer is only 35%, and the utilization rate of phosphorus fertilizer is only 10-25%. The low utilization rate...

AI Technical Summary

Problems solved by technology

However, in recent years, the extensive use of chemical fertilizers has also brought great disadvantages

For example, the utilization rate of chemical fertilizers in China is not high, the utilization rate of nitrogen fertilizer is only 35%, and the utilization rate of phosphorus fertilizer is only 10-25%. The low utilization rate of these fertilizers not only causes serious waste of resources, but also causes a large amount of fertilizer to accumulate in the soil , causing soil agglomeration, low water storage rate, and some fertilizers flow into groundwater or lakes, causing environmental pollution

[0003] Aiming at the problem of excessive use of chemical fertilizers and low utilization rate, people have researched slow and controlled release fertilizers. Slow and controlled release fertilizers refer to fertilizers with slow nutrient release rate and a long release period, which can meet the growth needs of crops throughout the growth period of crops. fertilizer

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