两用核不育杂交稻生育后期施氮钾肥的生理效应及产量

Physiological Aspects and Grain Yield of Photoperiod Temperat-ure Sensitive Genic Male-sterile Lines of Rice Hvbrids(F_1)Supllied N and K at Late Growth Stage

两用核不育杂交稻，Ｗ６１５４Ｓ×ＤＦ_０、Ｗ６１５４Ｓ×特三矮开花前和开花后６－７天追施氮、钾肥，明显提高生育后期叶片含氮量、叶绿素含量、绿叶面积，￣（１４）Ｃ－同化产物从剑叶的输出率（％）及分配到稻穗的量增加，可溶性糖和淀粉含量增加，穗粒性状改善，稻谷产量提高。但不同组合杂交稻上述性状有差异。

Nitrogen and potassium have been supllied at late growtn stage about 6～7days before/ after flowering of photoperiod-temperature sensitive genic male-sterile11nes of rice hybrids (PTGMSLR)(F_1)W6154S×DF_0 and W6154S×Tie-San-Ai.The nitrogen content in flag leaf ,chlorophyll total contents of top 3 leaves ,green leafarea,￣(14)C-metabolism exported from flag leaf and accumulated in panicle,soluble sugarand starch contents in vegetative organs and panicle ,and gtain yield in N and K treat-menr at late growth stage increase more than that in control treatments of bare and basicmanure.The physiological aspects and grain yield are different in different rice hybrids(F_1) at condition of N and K treatments at late growth stage.