草业学报2017，Vol.26Issue(6)：98-104,7.DOI:10.11686/cyxb2016265
氮素对紫花苜蓿种子产量与氮累积动态变化的影响
Effects of nitrogen application on seed yield and nitrogen accumulation in alfalfa (Medicago sativa)
摘要
Abstract
To investigate nitrogen (N) uptake,N fertilizer management and N utilization in alfalfa (Medicago sativa) seed crops a field experiment with four N treatments (0,45,90,and 135 kg N/ha) and two alfalfa cultivars,Aohan and Gongnong No.1 was established to compare the effects of N application on seed yield,seed quality,N harvest index and the dynamics of N accumulation and distribution in alfalfa plants.The results showed that the seed yield and N harvest index were decreased while the pod setting rate,seed weight per plant,1000 seed weight and seed quality of both cultivars were increased with increased N application.The dynamic changes of N accumulation and distribution were influenced by cultivar.The optimum N application rate for Aohan was 45 kg N/ha at the budding stage and 90 kg N/ha at the podding stage whereas the optimum N application rate for Gongnong No.1 was 45 kg N/ha at flowering stage and 45 kg N/ha at podding stage.The initial results confirmed the value of N fertilizer application and the regulation of N fertilizer requirements in alfalfa seed crops in the Chifeng area,and provided useful information for the determination of appropriate N fertilizer use in alfalfa seed crops.关键词
氮素/紫花苜蓿/种子产量/氮累积/动态变化Key words
nitrogen/alfalfa/seed yield/nitrogen accumulation/nitrogen dynamics引用本文复制引用
陈玲玲,任伟,毛培胜,乌仁图雅,王胜男,梁庆伟..氮素对紫花苜蓿种子产量与氮累积动态变化的影响[J].草业学报,2017,26(6):98-104,7.基金项目
现代牧草产业技术体系(CARS-35)资助. （CARS-35）
