水稻早熟品种分蘖生产力的初步分析Ⅷ.不同插秧形式的分蘖生产力

A Study on Heritance of Stalk Diameter of Endemic Sorghum Varieties in China

摘要:

本研究着重探讨了水稻超稀植栽培技术中插秧形式对分蘖生产力的影响。设置了30cm×26.4cm、40cm×20cm和(50+30)cm×20cm三种不同插秧形式的处理。试验结果表明：在同等密度条件下，30cm×26.4cm形式有利于增加有效穗数，40cm×20cm形式的单垄宽行有利于增加1穗粒数，(50+30)cm×20cm形式的双垄宽行有利于增加千粒重。因此，水稻超稀植栽培的插秧形式要考虑土壤肥力，即窄行稀植(如30cm×26.4cm)适于低肥力土壤，以便增加穗数;宽行稀植适于肥力较高的土壤或增肥田，以便增加穗粒数或提高千粒重。

Abstract:

Stalk diameter of endemic sorghum varieties in China was studied hy using multivariate regression analysis method of generation mean analysis. The results showed that stalk diameters in F₁ were different among different cross combinations, but hetemeis was positive and tended to the parent with high combining ability. Additive effect for stalk diameter was main and 33.2% of total genetic variation. Epistasis effect should be more important than dominant effict, but dominant effect took effect on some cross combinations. Gene effect of 3 cross combinations presented different. Additive effect and dominant effect were positive, and they were the reason that stalk diameter in F₁ presented positive heterosls.