水土保持学报2017，Vol.31Issue(4)：235-240,6.DOI:10.13870/j.cnki.stbcxb.2017.04.037
不同土壤肥力水平下施氮对甘薯产量与氮肥利用率的影响
Effects of Nitrogen Application on Yield and Nitrogen Use Efficiency of Sweet Potato Under Different Soil Fertility
摘要
Abstract
Effects of different nitrogen application rates on sweet potato yield and nitrogen use efficiency under different soil fertility conditions were explored.Field experiments were carried out to investigate the effects of nitrogen fertilizer on yield,yield components,dry matter accumulation and nitrogen use efficiency of Yanshu25,under different soil fertility levels.As results showed,without nitrogen fertilizer,the number of branches,the length of the longest stem,the leaf area index,and the yield were following this order:highsoil fertility＞middle soil fertility＞low soil fertility,and the differences were significant.Nitrogen fertilizer could increase the first three indices under three soil fertility conditions (P＜0.05),but had no significant effect on the number of the largest internodes.Field plots with high,middle and low fertility levels gained the largest yields when nitrogen fertilizers were 50,100,and 150 kg/hm2,respectively,which increased by 16.06％,29.63％ and 33.33％,respectively,compared to the control.Besides,nitrogen fertilizer could increase accumulation of above-ground dry matter s of sweet potato under all soil fertility levels.Lastly,with the increasing of nitrogen addition,the nitrogen accumulation were increased for middle and low fertility of plots,but first increased and then decreased for high fertility of plots.With the increasing nitrogen application rates,nitrogen use efficiency decreased under the high fertility,while increased under the low fertility,and was the highest under the middle fertility with 100 kg/hm2.The optimum nitrogen application rates for sweet potato in high,middle and low soil fertility are 50,100 and 150 kg/hm2,respectively.关键词
土壤肥力/氮肥施用量/氮肥利用率/甘薯/干物质积累量Key words
soil fertility/nitrogen fertilizer application/nitrogen use efficiency/sweet potato/dry matter accumulation分类
农业科技引用本文复制引用
窦怀良,史衍玺,刘庆,李欢..不同土壤肥力水平下施氮对甘薯产量与氮肥利用率的影响[J].水土保持学报,2017,31(4):235-240,6.基金项目
现代农业产业技术体系建设专项(CARS-10-B10) （CARS-10-B10）
