Study on Effects of Plant Growth Regulator on Improving the Percentage of Productive Tiller in Super Rice

A field experiment was conducted to study the effects of plant growth regulator,GA3and NAA,on the percentage of productive tiller and structure of panicle and grain of super rice with Liangyoupeijiu,Y Liangyou No. 1,Yuxiangyouzhan and Huanghuazhan as materials. The results showed that the percentage of productive tiller was increased by 15. 69% ~ 34. 77% and 11. 35% ~ 17. 64% respectively after spraying of GA3and NAA,and the grains number per panicle was increased by 9. 02 ~ 11. 28 and 7. 72 ~ 11. 58 and the yield was increased by 6. 58% ~ 14. 02% and 7. 64% ~ 11. 44%,respectively. So spraying of GA3and NAA can improve the yield by controlling the occurrence and growth of unproductive tillers of super rice,increasing the grains number per panicle and delaying the senescence of root system.