摘要
采用大田试验,研究了3个施氮量处理对粳稻的干物质积累、籽粒产量、产量构成因素及氮肥利用效率的影响。结果表明:籽粒产量、有效穗数和每穗粒数随施氮量的增加呈增加趋势,结实率和千粒重则相反。抽穗期和成熟期各器官的干物质积累、含氮量和植株氮素积累量均随施氮量的增加呈增加的趋势。氮素生产效率、氮素吸收利用率、氮素农学利用率和氮素偏生产力4个氮素利用效率指标均随施氮量的增加呈下降的趋势,以氮素生产效率和氮素偏生产力的下降较为明显。
Field experiments were adopted to study the impacts of three nitrogen fertilizer rates on dry matter accumulation, grain yield, yield components and nitrogen utilization efficiency of japonica rice. The results showed that grain yield, effective panicles and grain number per panicle of japonica rice increased along with increasing nitrogen fertilizer rate, but seed setting percentage and thousand-seed weight decreased. Dry matter accumulation and nitrogen content in each organ and nitrogen accumulation in plant of japonica rice all showed a increasing trend along with increase of nitrogen fertilizer rate in both heading period and mature period. The producing efficiency, absorption efficiency, agricultural utilization rate and partial productivity of nitrogen all decreased with increasing nitrogen fertilizer rate, among which the nitrogen producing efficiency and the nitrogen partial productivity declined more obvious.
出处
《湖南农业科学》
2013年第11期34-37,40,共5页
Hunan Agricultural Sciences
关键词
水稻
氮肥
干物质积累
氮素利用效率
rice
nitrogen fertilization
dry matter accumulation
utilization efficiency of nitrogen
