With 18 Indica hybrid rice varieties as research materials,ear shape was divided into middle big ear and middle small ear.Seed set-ting rate was investigated and the effects of moderate high temperature from booting to heading on regenerative season were researched under natural condition.Results showed that there were differences in heat resistance among varieties.Among the 14 varieties,seed-setting rates of middle big ear and middle small ear of Shenyouyuehesimiao and Yongyou 4901 were above 85％,showing strong heat resistance.Seed-setting rates of middle big ear and middle small ear of Y Liangyou 911 was above 80％,showing relatively strong heat resistance.Seed-setting rates of middle big ear and middle small ear of other varieties were below 80％,and the seed-setting rates between middle big ear and middle small ear were above 10 percentage points,showing general or weak heat resistance.With the occurrence of high temperature,filling stage of first season shortened,yield reduced and heading period of regenerative season happened in advance. Finally, measures to reduce high temperature heat damage of regenerative season in Tongcheng City were put forward.
关键词
"一种两收"/杂交籼稻/高温热害/结实率/头季/再生季
Key words
Two harvesting of one sowing/Indica hybrid rice/High temperature damage/Seed-setting rate/First season/Regenerative season
万方数据