杂交早稻四个组合产量产量构成因素分析与生产对策

对四个早杂组合产量与产量构成的相关与通径分析表明,威优64每穗粒数对产量的直接作用和净作用最大,威优49、协优49和威优48-2均表现为有效穗对产量的直接作用和净作用最大.当亩有效穗少于25万和亩产低于500公斤时,增穗是增产的关键;而当亩有效穗超过25万和亩产高于500公斤时,关键是提高结实率.另外,本文提出了杂交早稻高产的穗粒结构,以及增穗和提高结实率的栽培途径.

Analysis of the Yield and Yield Components of Four Early Hybrid Rice Combinations and Its Agronomic Practices

The correlated responses of yields and yield components from the correlative and path coeficient analysis of 4 early hybird rice combinations cultivated in Jiangxi showed that the direct and net effects of the number of grains per panicle on the yield per mu in Wei-You 64 were maximum, however, in Wei-Yqu 49, Xie-You 49 and Wei-You 48-2, the panicles per mu were the principal effect on the yield. As fields with effective panicles below 25 × 10 4and yield per mu under 500 Kg, the increment of total effective panicles should be considered as the key factor for promoting the yield; however, when the effective panicles and yield per mu were higher than 25 × 10 4and 500Kg respectively, the efforts should be made to increase filled grains percentage. In addition, the reasonable yield components for high yielding and cultural practices for increasing the effective panicles per mu and the filled grains percentage were suggested in this paper.