Application of biochar-coated urea controlled loss of fertilizer nitrogen and increased nitrogen use efficiency

Chemical and Biological Technologies in Agriculture

Yuxin Ba¹  Zhengyi Hu²  Yiman Jia²  Wenfang Qi³ 

[1] Blue Sky Zhenggao (Beijing) Agricultural Science and Technology Co., LTD;College of Resources and Environment, University of Chinese Academy of Sciences;Shenwu Technology Group Corp Co., LTD;

关键词: Biochar;    Biochar-based fertilizer;    Slow-release coated urea;    Ammonia volatilization;    Nitrogen leaching;    Nitrogen use efficiency;   

DOI  :  10.1186/s40538-020-00205-4

来源: DOAJ

【 摘 要 】

Abstract Background The use of biochar-based N fertilizers have been considered among the most effective strategy for reducing nitrogen loss and improving nitrogen use efficiency (NUE). However, effect and mechanism of biochar-coated urea (BCU) controlling the loss of nitrogen from soil and NUE are rarely reported. Methodology In this study, a 65-d culture pot experiment of oilseed rape was used to investigate the impact of BCU on nitrogen leaching, ammonia volatilization, soil nitrogen concentrations, soil pH, nitrogen uptake, NUE and oilseed rape biomass as compared with urea and urea combined with biochar at same nitrogen level. Results Results showed that the application of BCU could minimize nitrogen loss mainly by reducing nitrate leaching loss; which could be attributed to the slow-release performance of BCU, followed by biochar induced adsorption/fixation of nitrogen due to the porous nature and surface functional groups of biochar. However, the application of BCU enhanced ammonia volatilization due to the increase of soil NH4 +–N concentration and pH value of microenvironment around urea by BCU. The application of BCU increased NUE by about 20% when compared with urea, since BCU reduced losses of nitrogen fertilizer and increased concentration of nitrogen in the soil as well as nitrogen uptake in oilseed rape. Furthermore, the reduction of nitrogen application by 20% when BCU served as a nitrogen source not only reduced nitrogen loss but significantly improved NUE, with no negative effect on the biomass of oilseed rape. Conclusion BCU can serve as a promising control release nitrogen fertilizer for reducing loss of nitrogen and increasing NUE. However further investigations are required to validate the dosage-effect relationship of BCU on crop yield at the field scale.

【 授权许可】

Unknown