Biodegradable organic polymeric nitrogen fertilizer and preparation method therefor

Abstract

The invention relates to the field of slow and controlled release of fertilizers, and specifically is a biodegradable organic polymeric nitrogen fertilizer and a preparation method therefor. Compared with existing fertilizer capable of slow and controlled release, the nitrogen fertilizer of the invention has the following advantages: (1) nutrient elements of carbon, hydrogen, oxygen and nitrogen of molecules of the nitrogen fertilizer of the invention are firmly connected to a same polymer chain by chemical bonds, thereby providing the nitrogen fertilizer with excellent properties of slow and controlled release. Total nitrogen release in water and soil shows an obvious rising trend within 1 to 20 days, and nutrient release is relatively slower within 20 to 90 days, thus greatly improving the utilization rate of the nitrogen fertilizer. and (2)After being applied in the soil, the biodegradable organic polymeric nitrogen fertilizer of the invention, under the effect of soil microbes and the water, gradually degrades into small-molecule nutrients for absorption and utilization by plants, so that the amount of nutrient elements of nitrogen fixed in the soil is reduced, and non-absorbable harmful substances are not left in the soil. The Biodegradable organic polymeric nitrogen fertilizer is a novel fertilizer that meets the green environmental protection requirements.

Description

technical field [0001] The invention relates to the field of slow and controlled release chemical fertilizers, in particular to a biodegradable organic high molecular nitrogen fertilizer and a preparation method thereof. Background technique [0002] Nitrogen is a nutrient element of special importance in the process of plant growth. Because the nitrogen fertility of the world's soil is not high, nitrogen is not easy to accumulate in the soil, and modern intensive agriculture has caused excessive loss of soil organic matter and nitrogen. In most cases, the increase in yield per unit of nitrogen is higher than that of phosphorus and potassium nutrients. Therefore, since the 20th century, the production of nitrogen fertilizer has been playing a pivotal role both at home and abroad. According to the survey, more than 80% of the arable land in our country is deficient in nitrogen, but at the same time the average utilization rate of nitrogen fertilizer in our country is only ab...

AI Technical Summary

Problems solved by technology

Although the slow and controlled release performance of chemical fertilizers can be endowed by coating methods, it also brings the following problems: it belongs to secondary processing, which leads to increased production costs; the nutrient content in chemical fertilizers is reduced, and contains components that cannot be absorbed by crops; The coating residues in the soil will cause pollution

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