【摘要】 以杂交中稻II优7号为材料,通过不同疏穴时期、疏穴规格与施氮处理,研究了超稀栽增产的作用时期、影响因素与施氮方法。结果表明,超稀栽培增产的作用时期是栽秧后第5周以前通过提高成穗率获得大穗而增产,最高苗期是决定成穗率的关键时期;水稻生长中期群体光照条件是影响成穗率和穗部性状的主导因素,该期增施氮肥只有在光照条件好的情况下才有效果;在超稀栽培的较小群体下,于最高苗期施氮肥具有降低苗峰、壮苗大穗,促进成穗率的提高而增产的作用。更多还原

【Abstract】 The effect stage,effect factors and N application method of super sparse cultivation on increasing grain yield of hybrid mid-season rice in winter waterlogged fields was investigated via ’II you 7 ’,a mid-season rice hybrid with different test treatments such as sparse hill stage,sparse hill density,super sparse cultivation and N application.The effect stage of super sparse cultivation on increasing grain yield was before 5 weeks after the tillers were planted by increasing percentage of earbearing tiller and grains per panicle,the top tillers stage was the key stage of decisive percentage of earbearing tiller.Improving light condition at top tillers stage was the decisive factor of percentage of earbearing tiller and traits of panicles,the effect of N application at top tillers stage on increasing grain yield could be shown only in good light condition.There were the effects of decreasing the number of top tillers,promoting big panicle,increasing the percentage of earbearing tiller and grain yield by N application at top tillers stage in super sparse cultivation.更多还原