亲本留桩节位920和尿素对杂交水稻再生制种产量的影响

EFFECTS OF RATOON STUMP HEIGHT OF THE PARENTS, GIBBERELLIN AND UREA ON HYBRID RICE SEED PRODUCTION FROM RATOONING PLANTS

采取四因素三水平正交试验研究亲本留桩节位、“92 0”和肥料对杂交水稻再生制种产量的影响 ,结果表明 :影响最大的是母本留桩节位 ,其次为父本留桩节位 ,再次为尿素用量 ,“92 0”影响最小。四因子的最佳组合方案为 :母本留倒 3节 ;父本留倒 1节 ;尿素每hm2 用 2 6 2 .5kg ;“92 0”每hm2 用 90g。

The orthogonal experiment design of four factors and three levels was adopted to study the effects of ratoon stump height of the parents and application of GA and urea on hybrid seed production from ratooning rice plants. The results showed that ratoon stump height of the female parent had the greatest influence, followed in order by ratoon stump height of the male parent, urea rate and gibberellin. The optimum combination was 3-node stump of the female parent+1-node stump of the male parent + urea 262.5 kg/hm 2 +GA 90g/hm 2.