不同施氮量对百优838生理特性及生长发育的影响

Influence of different rates of nitrogen fertilizer on growth and physiological characteristics of rice variety Baiyou 838

【目的】研究不同氮肥施用量对优质稻百优838生理特性和生长发育特点的影响,为百优838以及同类优质稻品种的栽培调控和群体控制提供理论依据。【方法】采用随机区组设计,设6个不同氮肥施用量(0、90、150、210、270、330kg/haN)处理,调查百优838生长期间茎蘖穗的生长动态变化及产量。【结果】百优838在低氮施肥水平下即可建立良好的群体结构、获得较高净物质含量和产量,90kg/haN处理下百优838的产量最高,为8390.4kg/ha,其对茎蘖数动态控制及最终的净物质含量最有利;330kg/haN处理产量最低。【结论】百优838对氮肥施用量较为敏感,最佳施氮量为90kg/haN。

[ Objective ]Effects of different rates of nitrogen fertilizer on growth and physiological characteristics of rice variety Baiyou 838 were investigated in order to provide best cultivation regulation and population control in Baiyou 838 and similar superior rice cuhivars. [Method]A randomized block experiment was conducted using six different nitrogen fertilizer dosage （0, 90, 150, 210, 270 and 330 kg/ha N） to investigate the growth dynamics of stem, tillering and panicle and yield during growing season. [ Results ]The good population with high net dry matter content and yield was found in Baiyou 838 under low nitrogen fertilizer treatment. N application 90 kg/ha gave the highest yield （8390.4 kg/ha）, and this treatment was also beneficial for controlling tillering and stem dynamic as well as net dry matter content. The yield was the lowest in treatment applied with 330 kg/ha. [Conclusion]The rice variety Baiyou 838 was found sensitive to different nitrogen application rates, however, N application 90 kg/ha was found to be the best dose for rice cultivation.