Effect of biochar amendment on nitrogen leaching in soils

• Main Authors: SHEN Chen, YAN Peng, WEI Ji-peng, ZHANG Lan, ZHANG Li-ping, LI Xin, HAN Wen-yan
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2018-06-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: biochar, nitrate nitrogen, leaching loss
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2018/4/20180402.htm

For the last decades, there has been an increasing interest in using biochar to reduce nitrogen leaching. In order to comprehensively summarize the influence of biochar application on NO₃^--N leaching, 41 papers published were collected and the data were analyzed by weighted average method. 86% of the research data indicated that biochar application could reduce soil NO₃^--N leaching, and the reduction percentage increased with the increasing amount of biochar application. 98.2% of the data showed that the application of biochar could reduce the leaching volume of soil water, and the averaged reduction rate was 10.0%. Greater responses were found in neutral soil(pH=6.48), the percentage of leaching loss of nitrate nitrogen was reduced by 30.7%. The results showed that the biochar could reduce the leaching of soil NO₃^--N with 24.6%, and its leaching effect was mainly related to biochar application rates and the raw materials, in addition, the soil type, soil pH and so on were also influential factors. However, the current researches were focused on soil column, long-term field studies still needed to verify its effect in the future.