杂交稻头季和再生产量构成因素的比较及相关与通径分析

The comparison and correlation and path analysis of yield and its components between the first and ratooning crop of hybrid rice

汕优669和汕优多系1号具有较高的再生稻生产潜力,可以作为接班组合进一步扩大示范推广.相关与通径分析表明,头季总粒数,再生季总粒数、结实率和千粒重对再生季产量形成有本质作用;头季和再生季的穗数对总粒数的正向直接效应最大,穗粒数对总粒数有负向作用.因此认为,穗数是决定再生稻产量的关键因素,在高产栽培攻取穗数的同时,应考虑穗粒数减少带来的负作用.另外,本文还对能再生利用的杂交稻新组合产量构成性状的选择依据进行了讨论.

Shanyou 669 and Shanyou Douxi 1, exhibiting high productive potentiality among the tested hybrid rice combinations,were expected to be the alternative crosses for the rice crop ratoon by further demonstration and extension.The results of correlation and path analysis indicated that the total number of spikelets in the first crop and the total number of spikelets,the filled spikelet percentage as well as 1 000 grain weights in the ratooning crop had their essential effects on the grain yield of the ratooning crop.The number of panicles of the first and ratooning crop directly performed the highest positive effects on the total number of spikelets in the ratooning crop,and the number of spikelets per panicle showed a high negative effect on the total number of spikelets in the first and ratooning crop.So,the number of panicles in the first and ratooning crop was considered as a key factor to increase the ratooning rice yield,at the same time,it must be taken note of the negative effect of the reduced number of spikelets per panicle,resulting from the increased number of panicles in the first and ratooning crop by high yielding cultivative practice.In addition,the selection of yield and its components in the new hybrid rice combinations used for the crop ratoon was also discussed in this paper.