【摘要】 为探讨籼型杂交中稻中优752的高产形成规律,设计不同氮肥用量、不同施氮时期和不同密度处理,以创造不同的群体。研究表明:(1)中优752的产量主要受每穗粒数和有效穗数的影响,结实率和千粒重对产量的影响不明显;(2)产量与生育后期的干物质生产、氮磷钾的吸收量、颖花伤流量、库源增量比呈极显著正相关,与早发度、粒叶比呈显著正相关,与生育后期根系活力衰退值、剑叶温度呈显著或极显著负相关。更多还原

【Abstract】 In order to approach the law of high-yield forming of Medium Indica Hybrid Rice Zhongyou 752,an experiment was carried out with different N rates,different application stages of nitrogen and different plant density treatments.The results were as follows:(1)The grain yield was determined mainly by spikelets per panicle and effective panicles,not significantly by the filled grain percentage and 1000-grain weight.(2)The dry matter production,the uptake of N,P,K,the spikelet-bleeding intensity,and the source to sink in increment after flowering were significantly positively correlated with the grain yield.Meanwhile the ratio of shoot dry weight to LAI in 1st branch and grain-leaf ratio were positively correlated with the grain yield.But the degradation ratio of root activity and temperature of flag leaf after flowering were negatively or significantly negatively correlated with the grain yield.更多还原