辽粳系列水稻品种产量形成及其生理的研究

用具有代表性的辽粳系列8个水稻品种,通过对不同品种产量及生理基础研究,总结出高产优质辽粳系列水稻品种株高105～115cm,穗长14～18cm,一次枝梗10～13个,二次枝梗15～22个,有效穗数285～330万穗/hm2,每穗粒数100～120粒,千粒重24～25g。提出进一步提高辽粳系列水稻品种产量的限制因素是成穗率、每穗粒数和成粒率;辽粳系列水稻新品种选育应具有适宜的叶面积指数,并注重对经济系数的选择。

Studies on Yield Components and Physiology of Liaojing Series Rice Varieties

Yield components and physiology of 8 typical varieties of Liaojing series rice varieties were studied. The results showed that Liaojing series rice with high yield and quality have the characters as below: The rice cultivars have the plant height range from 105-115 cm,panicle length range from 14-18cm,primary riches branches range from 10-13,secondary riches branches range from 15-22,effective panicles per 667m2 range from 190 000-220 000,ripened grains per panicle range from 100-120,1000-grain weight range from 24-25g. So percentage of ripened grains,ripened grains per panicle and percentage of ripened grains may limit the yield increment of Liaojing series rice. Suitable LAI and economic coefficient is important in breeding of high yield new varieties of Liaojing series rice.