水稻典型品种齐穗后干物质积累动态比较

为了研究超级稻品种齐穗后的干物质形成特性,为水稻高产栽培提供技术支撑,选择在四川应用较多的6个超级稻品种和3个在生产上表现典型的品种,对齐穗后的穗子、植株的干物质积累动态进行了研究。结果表明,齐穗后,川香9838、II优084、准两优527、川香727穗子的鲜重、干重增重速率较高,且在灌浆阶段0～7 d、17～29 d区间形成两个明显的峰值;II优7号、D优527、II优602、II优航1号穗子增重速率较低。II优084、准两优527、II优602齐穗后植株鲜重、干重增重速率较高,川香727、D优527、II优航1号齐穗后植株干重增重速率较低。

Effect of Different Nitrogen Application Amount on the Net Increment of Fresh Dry Weight in Hybrid Rape

[ Objective] The aim of the research was to provide reference for reasonable application of nitrogen fertilizer for high yield.cultivation of hybrid rape cuhivar Youyan 9 and Youyan 10. [ Method] The net increment changes of individual plant fresh weight and dry matter weight of Youyan 9 and Youyan 10 with different nitrogen application treatments were studied. [ Result] The differences among average fresh weight increments of individual plant and average dry matter weight increment of individual plant with different treatments reached 0. 01 extremely significant level. Fresh weight increment and dry matter weight net increment of individual plant declined gradually with the increase of nitrogen application. In growtheourse ,fresh weight net increment of individual plant increased firstly then decreased and the maximum was in beginning flowering stage, besides that dry matter net increment increased gradually and the maximum was in mature period. The correlations among fresh net increment, dry matter weight net increment and yield net increment were positive or extremely positive. [ Conclusion] Under experimental condition, when nitrogen application was 225 kg/hm^2, hybrid rape Yanyou 9 and Yanyou 10 with low erucic,low glucosinolate could obtain high yield.