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[1]WANG Siyuan,NING Jianfeng,WANG Ronghui,et al.Clay Mineral and Biochar Mixture Coated Urea Preparation and Its Nitrogen Pollution Reduction Potential[J].Research of Soil and Water Conservation,2019,26(05):151-157.

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Clay Mineral and Biochar Mixture Coated Urea Preparation and Its Nitrogen Pollution Reduction Potential

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 151-157 Column: Public date: 2019-09-06

Title:: Clay Mineral and Biochar Mixture Coated Urea Preparation and Its Nitrogen Pollution Reduction Potential

Author(s):: WANG Siyuan, NING Jianfeng, WANG Ronghui, LI Mengjun, YAO Jianwu, SHEN Jian, ZHOU Kaijun, AI Shaoying; Institute of Agricultural Resources and Environment, Key Laboratory ant Nutrition and Fertilizer in South Region, Ministry of Agriculture Guangzhou, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China

Keywords:: mixture of clay mineral and biochar; coated urea; nitrogen pollution reduction

CLC:: S145.5

DOI:: -

Abstract:: In order to promote high efficient utilization of fertilizer and reduce nitrogen pollutant emission, we used bentonite and biochar as coating materials and combined nitrification inhibitor to prepare coated urea. The coated urea leaching simulation experiments were conducted to collect leaching solution, and static box method were also used to collect N₂O. Nitrogen reduction potential of coated urea was evaluated by analyzing NH₄⁺-N, NO₃^--N leaching amount and N₂O emission flux. The results showed that:(1) bentonite and biochar coated urea (F₄) has the lowest NH₄⁺-N leaching loss rate, the NH₄⁺-N leaching amount of the coated urea decreased by 19.99% compared with chemical urea (F₁); (2) nitrification inhibitor combined, bentonite and biochar coated urea (F₅) demonstrated minimum NO₃^--N leaching loss rate, the leaching loss rate of NO₃^--N decreased by 16.74% compared with F₁; (3) F₅ also showed the minimum N₂O emissions flux, N₂O emission decreased by 77.8% compared with F₁. Therefore, F₅ has the effect of optimal nitrogen pollution reduction. The reason is that nitrification inhibitor can control nitrification and denitrification process through chemical process which can delay the hydrolysis of amide nitrogen and the nitrification of ammonium nitrogen, thus to minimize N₂O emission significantly and reduce NO₃^--N leaching loss as well. In addition, the coating materials of bentonite and biochar in F₅ have high adsorption on NH₄⁺-N, which can concentrate more NH₄⁺-N in the top soil, thus reduce NH₄⁺-N leaching. In summary, urea combined with nitrification inhibitor and coated by bentonite and biochar has the best potential for nitrogen pollutant reduction, which can reduce NH₄⁺-N, NO₃^--N and N₂O by 15.24%, 16.74% and77.8%, respectively.

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