Environment friendly composite material for controlling loss of nitrogen fertilizer and applications

Abstract

This invention discloses a method for preparing environmentally friendly composite for controlling nitrogen fertilizer loss. The method comprises: (1) mixing attapulgite, chitosan, polyacrylamide, etc.; (2) irradiating at 500-1300 Gy to form the composite. The composite can be mixed with nitrogen fertilizer and granulated to form controlled-release nitrogen fertilizer granules (with diameters of 1.5-3 mm). The composite can cooperatively adsorb and fix nitrogen and decrease fertilizer requirement, thus can prevent nitrogen entry into water and air and efficiently control water eutrophication and greenhouse gas N2O emission. The composite has such advantages as low cost and high efficiency in fixing nitrogen.

Description

technical field [0001] The method relates to a modified environment-friendly composite material and its application, which can reduce greenhouse gas emissions from chemical fertilizers and non-point source pollution from eutrophication of water bodies. Background technique [0002] In 2002, the United Nations Environment Program published the "Global Environment Outlook" report, which listed the deterioration of air and water pollution as the first of the eight major environmental problems. The most important cause of air pollution is greenhouse gas emissions, and water pollution is mainly caused by the entry of nitrogen and phosphorus into water bodies, resulting in eutrophication of water bodies. A study shows that due to the extensive use and improper use of chemical fertilizers, 1.235 million tons of nitrogen flows into rivers and lakes through surface waters, 494,000 tons enters groundwater, and 2.99 million tons enters the atmosphere in my country every year. Nitrogen...

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Problems solved by technology

In addition, my country has about 200,000 km 2 of the offshore waters are affected by pollution, about 40,000 km 2 The water