烟草科技2019，Vol.52Issue(3)：18-25,8.
基于微区设计的多雨地区烟田土壤氮素平衡研究
Study on nitrogen balance of tobacco-planting soils in rainy regions based on micro-area design
摘要
Abstract
To investigate the nitrogen balance of tobacco-planting soils in rainy regions, the absorption and utilization of nitrogen by flue-cured tobacco and the fate of fertilizer nitrogen in tobacco-planting soils were studied by 15N isotope tracer test under different rainfall conditions (900-1 100 mm) during tobacco growing season. The results showed that with the increase of nitrogen application rate, the absorption of fertilizer nitrogen increased, while nitrogen utilization efficiency decreased. And the residual fertilizer nitrogen in soils and fertilizer nitrogen loss by runoff, leakage and the other forms increased significantly. Within the nitrogen application rate of 90-150 kg/hm2, the nitrogen utilization efficiency of flue-cured tobacco dropped from 31.38% to 21.68%, and the proportions of residual fertilizer nitrogen and fertilizer nitrogen loss by runoff, leakage and the other forms accounted for 27.65%-30.51% , 22.42%-25.79% , 12.09%-15.16% and 6.47%-10.29% of nitrogen application rate, respectively. The utilization efficiency of residual fertilizer nitrogen in soils by flue-cured tobacco was from 7.10% to 8.15% in the 2nd year. And the residual fertilizer nitrogen in soils and fertilizer nitrogen loss by runoff, leakage and the other forms still accounted for 8.89%-9.95%, 4.46%-4.68%, 5.73%-6.59% and 1.16%-1.37% of the original nitrogen application rate, respectively. Therefore, higher residual fertilizer nitrogen in soils and more fertilizer nitrogen loss by runoff and leakage are the main reasons causing the lower nitrogen utilization efficiency of flue-cured tobacco in rainy regions, and the appropriate control of nitrogen application rate and reduction of fertilizer nitrogen loss by runoff and leakage are the main ways to promote the nitrogen utilization efficiency of flue-cured tobacco.关键词
烤烟/肥料氮/氮肥利用率/径流/渗漏Key words
Flue-cured tobacco/Fertilizer nitrogen/Nitrogen utilization efficiency/Runoff/Leakage分类
农业科技引用本文复制引用
汪耀富,邵孝侯,孙德梅,陈立华..基于微区设计的多雨地区烟田土壤氮素平衡研究[J].烟草科技,2019,52(3):18-25,8.基金项目
中国烟草总公司科技重大专项项目"基于红外技术的新型卷烟研究与开发"110201401016(XX-04). （XX-04）
