Ecologic slow-released diammonium phosphate and preparation method thereof

Abstract

Diammonium phosphate is a high-concentration and water-soluble fertilizer which has less solid content after being dissolved and provides nitrogen and phosphorus elements for crops, however, the long-term field trial and research results show that for crops which are fond of phosphorus and needs nitrogen, the nitrogen content of the diammonium phosphate is low and cannot meet the demands of the crops, and on the other hand, after the diammonium phosphate is applied into the soil, only 30-50% of diammonium phosphate can be absorbed and utilized by the crops, and the rest is lost in vain. At present, the farmland soil is severely polluted by heavy metals and fertilizer damage; the soil is lack of organic matters and medium trace elements in general; and the soil fertility is reduced, and the productivity is lowered. According to the ecologic slow-released diammonium phosphate and the preparation method, the ecologic slow-released diammonium phosphate is a mixture granule of two colors, namely, an enveloped nitrogen granular-fertilizer carrier and a phosphorus granular-fertilizer carrier; the demands of the crops on nitrogen and phosphorus are met; the enveloped granules prolong the release time of nutrients, the loss of the nutrients is reduced, and meanwhile the crop yield is increased and the soil is improved through the ecologic organic matters and the medium trace elements such as B and Zn added into the shell.

Description

Technical field [0001] The invention relates to a diammonium phosphate, which is characterized in that it consists of two kinds of granules, one uncoated granule and the other coated granule, orange red and white, orange red and black. Ecological slow-release diammonium phosphate rich in various substances and long nutrient release time in film and preparation method thereof Background technique [0002] At present, the known diammonium phosphate is a high-concentration quick-acting fertilizer that is easily soluble in water, and the dissolved solids are less suitable for the needs of various crops for nitrogen and phosphorus elements, especially suitable for use as base fertilizer, seed fertilizer, top dressing. However, long-term field experiments and research results have shown that for crops that love phosphorus and nitrogen, the content of diammonium phosphate nitrogen is too low to meet the needs of crops. On the other hand, after diammonium phosphate is applied to th...

AI Technical Summary

Problems solved by technology

However, long-term field experiments and research results have shown that for crops that love phosphorus and nitrogen, the content of diammonium phosphate nitrogen is too low to meet the needs of crops. On the other hand, after diammonium phosphate is applied to the soil, only 30%-50 % can be absorbed and utilized by crops, while the rest is lost in vain

The soil of cultivated land is currently seriously polluted by heavy metals and fertilizers; the soil generally lacks organic matter and medium and trace elements; more than 50% of nitrogen is lost; crops are planted continuously, which leads to aggravation of soil-borne diseases; soil fertility and productivity decline

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