施氮量对超级稻‘松粳9号’产量及氮肥利用率的影响

为了探讨施氮量与‘松粳9号’干物质积累、产量、氮肥利用率之间的关系,明确最佳氮肥施用量,使其在生产中真正发挥超级稻的增产潜力。以超级稻‘松粳9号’为材料,通过田间小区对比试验,研究了不同氮肥施用量对超级稻‘松粳9号’产量及氮肥利用率的影响。结果表明,在水稻齐穗期,地上部植株干物质积累量和吸氮量都随着施氮量的增加而增加;成熟期地上部植株干物质积累量和吸氮量都随着施氮量的增加出现先增后减的趋势。氮肥利用率随着施氮量的增加而降低。随着施氮量的增加产量出现先增后减的趋势。产量与成熟期稻穗和植株干物重、齐穗期稻穗含氮量、成熟期稻穗和植株含氮量呈极显著正相关,与氮肥生理利用率呈显著正相关。施氮量195 kg/hm2能实现超级稻‘松粳9号’最高产量。

Effects of Nitrogen Rate on Yield and Nitrogen Use Efficiency of Super Rice ＇ Songjing 9＇

The effects of different nitrogen rate on yield and nitrogen use efficiency of super rice ＇Songjing 9＇ were studied using ＇Songjing 9＇ as material by experimental plot comparative field, in order to discuss the relationship of nitrogen rate with dry matter accumulation, yield and nitrogen use efficiency of ＇Songjing 9＇, make the optimum amount of nitrogen fertilizer clear and explore its potential in yield increase of super rice production. The results indicated that, the dry matter accumulation of aboveground plant and nitrogen uptake increased with the increase of nitrogen rate during rice full heading time. Dry matter accumulation of aboveground plant and nitrogen uptake increased first and then decreased with nitrogen rate increased during maturation period. Nitrogen use efficiency decreased with nitrogen rate increased. The yield increased first and then decreased with nitrogen rate increased. Yield had highly significant positive correlation with rice and dry weight of plant at maturation period, rice nitrogen in full heading stage and nitrogen content of spikes and plant in mature stage, and had significant positive correlation with nitrogen physiological efficiency. The highest yield of ＇Sonziinz 9＇ could be realized whennitrogen rate was 195 kg/hm2.