Abstract: A pot culture experiment was conducted to study the effects of soil water potentials at ranges from-30 to(-35) kPa,-60 to-65 kPa and 0 kPa(check) during different developmental stages on panicle characters and grain yield by(using) two rice varieties Shangyu 397 and Suijing 3 as materials.The treatments at panicle-formation period had the greatest effect on panicle characters and the panicle number under the treatments was significantly more than that in control.The panicle length,numbers of panicle nodes and branches under the treatments during panicle-formation period were also significantly more than those under the control and the treatments during the other periods.However,the difference of panicle number between two soil water potentials was not significant among all the treatments at each treatment stage.The grain yields under the treatments during panicle-formation period were significantly lower than that in control.Obvious effects of soil water potential on grain yields under the treatments at the tillering stage and one to ten days after heading were founded.Panicle length,numbers of panicle nodes and branches were significantly positively correlated with the yield of the middle-position grain and inferior grain.

Key words: rice, soil water potential, panicle character, grain yield

摘要： 采用控制土壤水分方法，研究了不同生育阶段土壤水势(-30~-35 kPa和-60~-65 kPa和正常灌水0 kPa)对水稻上育397、绥粳3号穗部性状及产量的影响。结果表明，长穗期处理对2个品种穗部各性状的影响最大，此处理下上育397、绥粳3号的穗数显著高于对照，而穗长、穗节数、穗颈节枝梗数均极显著低于对照及其他处理，但同一时期不同处理间差异不显著。2个品种长穗期处理时的产量极显著低于对照，其次是分蘖期和抽穗后1～10 d的处理对产量影响较大，多数处理与对照的差异达到显著或极显著水平。穗长、穗节数、穗颈节枝梗数与各粒位籽粒产量均呈正相关，且与中位粒和劣势粒产量的相关系数均达到了显著或极显著水平。关键词

关键词: 水稻, 土壤水分, 穗部性状, 产量