土壤2015，Vol.47Issue(1)：20-25,6.DOI:10.13758/j.cnki.tr.2015.01.004
不同密度和氮肥用量对水稻产量、构成因子及氮肥利用率的影响
Effects of Nitrogen Application Rate and Planting Density on Grain Yields, Yield Components and Nitrogen Use Efficiencies of Rice
摘要
Abstract
An experiment was carried out to study the interactive effect of nitrogen(N) fertilizer rate and planting density on rice yield and N use efficiency in order to provide a basis for rational cultivation management.The results indicated that the N rate and planting density had significant effects on grain yield of rice and the interactive effect was also significant.Compared with the no N treatment,the average yields of the treatments with N rates of 82.5,165.0 and 247.5 kg/hm2 increased by 30.6％,47.8％ and 44.6％,respectively.The plant density was 21 × 104 seedlings/hin2 for the highest grain yield.Increasing the N rate and planting density significantly increased the number of spikes per unit.However,grains per spike,seed setting rate and thousand grain weight decreased with the increase of planting density.N use efficiency decreased at the higher N application rate,but increased first and then dropped with the increase of planting density.Planting density also had significant effects on grain yields of rice,increasing density promoted rice yield under the condition of low N rate (0 and 82.5 kg/hm2),but for the high density treatment,higher N rate significantly decreased the yield.In this study,the appropriate nitrogen application rate and plant density of rice were 194.9 kg/hm2 and 22.1 × 104 seedlings/hm2,respectively.关键词
氮肥/密度/水稻/产量/氮肥利用率Key words
Nitrogen/Density/Rice/Yield/Nitrogen use efficiency分类
农业科技引用本文复制引用
邓中华,明日,李小坤,郑磊,徐维明,杨运清,任涛,丛日环,鲁剑巍..不同密度和氮肥用量对水稻产量、构成因子及氮肥利用率的影响[J].土壤,2015,47(1):20-25,6.基金项目
公益性行业(农业)科研专项(201303103)、中央高校基本科研业务费专项(2013PY113)、长江学者和创新团队发展计划项目(IRT1247)资助. （农业）
