土壤与作物2018，Vol.7Issue(2)：242-247,6.DOI:10.11689/j.issn.2095-2961.2018.02.018
秸秆覆盖条件下不同施氮水平对春玉米产量及氮肥利用率的影响
Effects of different nitrogen application rates on spring maize yield and nitrogen fertilizer utilization efficiency under straw cover
摘要
Abstract
This study, based on the Experiment of Straw Return , aimed to examine the effects of different nitrogen application rates on spring maize yield and nitrogen fertilizer utilization efficiency under straw cover , and defined the relationships between spring maize yield and nitrogen fertilizer application rates .In the experiment , straw cover was regarded as main plots and different amounts of nitro-gen fertilizer, i.e.0, 135, 180 and 225 kg· hm-2, were regarded as subplots.The production of spring maize and nitrogen fertilizer utilization efficiency were determined after harvest .The results showed that straw cover decreased plant height ( 2.71％-6.55％) , cob length (4.26％-10.1％), cob diameter (3.92％-7.74％) and 100-grain weight (0.67％-1.68％) in 0, 135 and 180 kg· hm-2 plots, thus resulting in a decrease of maize yield from 4.30％-11.0％ (P<0.05) .However, straw cover increased plant height by 6.41％, cob length by 6.38％, cob diameter by 5.67％and 100-grain weight by 4.29％in 225 kg· hm-2 plots, respec-tively, thus resulting in an increase of maize yield by 6.82％ (P<0.05) .Spring maize yield was positively correlated with the nitro-gen fertilizer application rate in plots with straw cover , i.e.both yield and yield components increased with the increasing nitrogen fer-tilizer application rate.With straw cover , both nitrogen agronomy use efficiency and nitrogen partial factor productivity decreased with the increasing nitrogen application rate , indicating that the enhancing effect on maize yield and nitrogen utilization efficiency brought by straw cover was associated with nitrogen application rate .Among the 4 nitrogen fertilizer application rates , 225 kg· hm-2 combined with straw cover was the most practical way in agriculture practice .关键词
秸秆覆盖/施氮量/春玉米/产量/氮肥利用率Key words
straw cover/nitrogen application rate/spring maize/yield/nitrogen fertilizer utilization efficiency分类
农业科技引用本文复制引用
焦晓光,王晓军,徐欣,周珂,谢洪宝,高洪生..秸秆覆盖条件下不同施氮水平对春玉米产量及氮肥利用率的影响[J].土壤与作物,2018,7(2):242-247,6.基金项目
国家重点研发项目春玉米、粳稻主产区肥料高效利用技术(2017YFD0300503)资助. （2017YFD0300503）
