Soil fertility management impact on N2O and NH3 emissions in a double maize-based cropping system in Southern China
作者单位：Institute of Crop Science Chinese Academy of Agricultural Sciences/ Key Laboratory of Crop Physiology and Ecology Ministry of Agriculture
会议名称：《中国农学会耕作制度分会2016年学术年会》
会议日期：2016年
关 键 词：Greenhouse gas emissions Nitrogen use efficiency
摘 要：【Objective】Fertilization has been widely used as a common management practice to maintain soil fertility and crop productivity. However, the continual uses of fertilizers possess serious threat to the environment because of greenhouse gas emissions(GHG) and its impact on global warming. The main objective of the study which is still ongoing was to study the impact of soil fertility management on NO and NH emissions as well as nitrogen use efficiency(NUE) in a long term double maize cropping system in Southern China. 【Method】To achieve this five treatments comprising of control-CK, organic manure-OM, nitrogen only-N, NPK and NPK +OM-NPKM were selected in a randomly complete block design with three replications. 【Result】In all, there are four seasons with two already completed. Preliminary results indicated that OM and NPKM had the highest NO and NH emissions that could impact negatively on the environment. The peak emission for NO was recorded around the 4th week after fertilization but NH volatilization peaked on the 3rd day. The tentative results also indicated that OM was more efficient in using nitrogen fertilizer and N was the least. NPKM treatment has so far recorded the highest yield with N still trailing. The soil p H, temperature and moisture significantly affected the parameters measured. 【Conclusion】Tentatively it can be concluded that OM fertility management is the best choice for the rain fed area since it had the highest NUE, less GHG emissions with respect to NPKM and yield not significantly different from NPKM.