Influences of biochar addition on vegetable soil nitrogen balance and pH buffering capacity

2nd International Conference on Agricultural and Biological Sciences

农业科学;生物科学

Yu, Y.^1,2 ; Odindo, A.O.^2 ; Xue, L.^1 ; Yang, L.^1

Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, Jiangsu

210014, China^1

University of KwaZulu-Natal, Scottsville

3209, South Africa^2

关键词: Experimental crops;    Nitrogen leaching;    Nitrogen utilization efficiencies;    pH buffering capacity;    Soil conditions;    Soil organic matters;    Tai-Lake regions;    Vegetable soil;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/41/1/012029/pdf
DOI  :  10.1088/1755-1315/41/1/012029

来源: IOP

【 摘 要 】

Leaching is a major path for chemical nitrogen fertilizer loss from in vegetable soil, which would destroy soil pH buffering capacity soil and result in acidification. It has been a common phenomenon in Tai Lake Region, China. However, few study focused on the change soil pH buffering capacity, especially the effect of soil amendment on pH buffering capacity. In this study, a pot experiment was conducted to research the effects of biochar addition to a vegetable soil on nitrogen leaching and pH buffering capacity with pakchoi (B.chinensis L.) growth as the experimental crop. The results showed that biochar could significantly increase the pakchoi nitrogen utilization efficiency, decrease 48%-65% nitrogen loss from leaching under the urea continuous applied condition. Biochar also could effectively maintain the content of soil organic matter and base cations. Therefore, it rose up soil pH buffering capacity by 9.4%-36.8% and significantly slowed down acidification rate. It was suggested that 1%-2% addition ratio was recommended from this study when used as similar soil condition.