不同施氮量对免耕/翻耕移栽稻生长及产量形成的影响

为探讨免耕移栽稻的氮肥管理措施和比较不同耕作方式下移栽稻的生长规律,研究了不同施氮量处理对免耕/翻耕移栽稻生长及产量形成的影响.结果表明,无论翻耕或免耕,增施氮肥可以促进分蘖的发生和叶面积的扩展;在水稻各生育时期,随着氮肥用量的增加,干物质的积累量有增加的趋势,每穗粒数和收获指数逐渐减少;水稻总吸氮量和实际产量逐渐增加,而氮肥吸收利用率、生理利用率和农学利用率及偏生产能力逐渐减小.翻耕移栽稻的分蘖能力、有效穗数和吸氮量显著高于免耕移栽稻,但翻耕和免耕对水稻产量及其构成因素的影响差异不显著,免耕移栽稻的氮肥生理利用率显著高于翻耕移栽稻.

Impact of different fertilizer-N application on growth and yield formation of transplanted rice under zero tillage and conventional tillage conditions

To elucidate the fertilizer-N management, the impact of different fertilizer-N application on the growth and yield formation of transplanted rice was studied under zero tillage and conventional tillage conditions. The results showed that application of fertilizer-N improved the rice tillering capability and leaf area index. The dry matter accumulation increased with fertilizer-N rate increase, but the grain number per panicle and harvest index decreased. With the increase in fertilizer-N rate, the total N uptake and actual yield increased, and N recovery efficiency, N physiological efficiency, N agronomic efficiency and partial factor productivity of applied N decreased. The tillering capability and productive panicle number and total N uptake of transplanted rice under zero tillage was significantly higher than that under conventional tillage, but there were no significant differences of yield and yield components between zero tillage and conventional tillage treatments. N physiological efficiency of transplanted rice under zero tillage was significantly higher than that under conventional tillage.