结实期施氮对寒地水稻群体源库关系及产量的影响

摘要

【目的】研究结实期不同施氮量对寒地水稻群体源库关系及产量的影响，为结实期合理施氮提供理论依据。【方法】采用随机区组设计，研究结实期5个施氮水平对空育131群体源库关系及产量的影响。【结果】施氮22．5～67．5 kg/hm2对空育131的叶面积指数、库容量、平方米穗数、穗粒数、千粒重、产量及整精米产量均有一定的促进作用，存在最适值；施氮67．5 kg/hm2时稻谷产量及整精米产量分别达到13581 kg/hm2、8914 kg/hm2，与对照差异均达到极显著水平。【结论】在寒地条件下，施氮67．5 kg/hm2对空育131的增产及其他指标的综合提高效果明显，结实期适量施氮可以提高群体稻谷产量和整精米产量。%Obj ective]The aim of this study was to explore the effects of nitrogen fertilizer during the productive phase on source-sink relationship and yield of rice population in the cold region. The results may provide a theoretical basis for reasonable application of nitrogen fertilizer.[Method]Randomized block design was used to investigate the effects of 5 nitrogen addition lev-els during the productive phase on source-sink relationship and yield of Kongyu 131 population.[Results]Nitrogen application (22. 5-67. 5 kg/hm2 )had positive effects on leaf area index,stor-age capacity,spikes grains of per square meter,grain number per spike,1 000-grain weight,yield and head rice of Kongyu 1 3 1 .When nitrogen application was 6 7. 5 kg/hm2 ,the grain yield and head rice were 13 581 kg/hm2 and 8 914 kg/hm2 ,respectively.They were significantly higher than those of the control.[Conclusion]In the cold region,when nitrogen application was 67. 5 kg/hm2 ,the yield and other indicators of Kongyu 131 were enhanced obviously.Nitrogen fertilizer during the productive phase may increase the yield of rice in groups and head rice.