Comparison Of Agronomical Traits For Hybrid Rice Crosses And Analysis On The Marginal Effect

As varieties materials of high-yield group Hunan Rice 14 regional trial tested, ac cording to randomized complete block experimental design method in 2010 mid-seaso n rice grown in high-yield Hunan Shaoyang area test points, analysis of the 14 combin ations of agronomic traits of hybrid rice, which can filter out suitable planting of hybri d rice in Hunan Shaoyang new combination. In addition, the marginal effect of differe nt species and cell yield relationship of the rearch, Aimed at breeding new hybrid rice combination to provide reference.Conclusions of this paper as follows:1) The yield of the tested varieties were varied between 554.6-618.00kg/667m2, with an average of 583.21kg/667m2,3.34% higher than that of the control Liangyoupeijiu of 564.33kg/667m2.11 tested varieties yield than the control, among them, four varieties including Niexiang5A/263, Aoliangyou 579, Tiansheng18 and Claingyou45 with higher yield than that of the control at significant level, reasonable growth duration and other excellent agronomic traits, can be participate in the next phase of testing. The data also indicated that the pilot areas of Shaoyang is suitable for region test.2) The order of the marginal effect is panicles per plant> total grains per panicle> filled grains per panicle> seed setting rate> 1000-grain-weight. The trait of panicles per plant of all strains were showed positive marginal effect, nevertheless, the 1000-grain-weight showed negative marginal effect. There are obviously marginal effect and significant difference among the varieties for the yield per plant. The marginal effect of yield per plant, ranged from 18.16-46.64%, with an average of 33.02%. The accuracy of yield evaluation with the experiment plot was affected by the marginal effect. For the trait of panicles per plant and total grains per panicle, the values were not correlated to the marginal effects at significant level. The marginal effect of plot yield was related to the yield traits. In general, the marginal effect of large panicle varieties was higher than that of the small ones.