草业学报2017，Vol.26Issue(12)：48-55,8.DOI:10.11686/cyxb2017079
土壤水分和施氮水平对紫花苜蓿苗期生长的互作效应分析
Interactive effects of soil moisture and nitrogen application rate on seedling growth of alfalfa
摘要
Abstract
Soil moisture significantly affects crop response to fertilizer application.This study investigated the effect of nitrogen application on the growth of alfalfa (Medicago sativa) in the middle and lower reaches of the Yangtze River and evaluated the interaction between soil moisture and nitrogen application rate effects with a semi-controlled pot experiment conducted in Nanjing.The experiment included three soil moisture levels (50％,70％ and 90％ of maximum water holding capacity) and four nitrogen application rates (0,90,180,270 kg/ha).Dry matter accumulation and nitrogen use efficiency increased with increasing soil moisture level.Under the same soil moisture level,dry matter accumulation and nitrogen use efficiency increased with appropriate N application rates,but decreased with excess nitrogen application.The interaction effect between soil moisture and nitrogen application rate was statistically significant.The effect of fertilizer nitrogen was significantly enhanced at higher soil moisture levels.With increased soil moisture,the effect of nitrogen application at moderate rates was also enhanced.Therefore,when soil moisture level is lower,nitrogen application should be carried out with irrigation.In the middle and lower reaches of the Yangtze River where there is high soil moisture,more nitrogen application could increase forage yield and nitrogen use efficiency of alfalfa.关键词
紫花苜蓿/土壤水分/施氮/互作效应/干物质积累/氮素利用率Key words
alfalfa/soil moisture/nitrogen application/interaction effects/dry matter accumulation/nitrogen use efficiency引用本文复制引用
王茜,纪树仁,沈益新..土壤水分和施氮水平对紫花苜蓿苗期生长的互作效应分析[J].草业学报,2017,26(12):48-55,8.基金项目
公益性行业(农业)科研专项(201403048)资助. （农业）
