超迟夏直播杂交水稻产量及产量性状的相关性

摘要

为川东北油菜 (或小麦)收获后杂交水稻超迟直播品种的选用和合理栽培技术措施的制定提供理论依据, 对46个杂交水稻品种进行油菜 (或小麦)收获后超迟夏直播试验, 利用相关和通径方法分析各品种的产量性状及其相关性.结果表明, 超迟夏直播条件下, 46个杂交水稻品种产量在510.7～730.7kg/667m2, 平均产量644.1kg/667m2;产量与有效穗、着粒数、实粒数、千粒重呈正相关, 与结实率呈负相关, 其中产量与着粒数、实粒数、实粒重呈极显著正相关;各产量性状对水稻产量直接作用由大到小依次为:实粒数>千粒重>有效穗>结实率.超迟夏直播条件下应选用实粒数和千粒重较高的水稻品种;内2优111、泸香优177、蓉优918和蓉18优198等4个品种产量表现较高, 可作为川东北油菜 (或小麦)收获后杂交水稻超迟直播品种的优先选择.%The yield traits and their correlations of 46 hybrid rice varieties were studied by correlation and path analysis to provide the theoretical basis for selection of hybrid rice varieties and formulation of rational cultivation technological measures under late summer direct sowing pattern after harvesting rape or wheat in East Sichuan.Result:The yield and average yield of 46 tested hybrid rice varieties is 510.7-730.7 kg/667 m2 and 644.1 kg/667 m2 under late summer direct sowing pattern after harvesting rape or wheat respectively.The yield is positively related to effective panicles, grain number, 1 000-grain weight and filled grain number and negatively related to setting percentage.The yield is positively related to grain number, 1 000-grain weight and filled grain number very significantly.The direct effect of four yield traits on rice yield is filled grain number>1 000-grain weight>effective panicles>setting percentage.The hybrid rice varieties with high filled grain number and 1000-grain weight should be selected as the suitable varieties for cultivation under late summer direct sowing pattern.Four hybrid rice varieties of Nei2 you 111, Luxiangyou 177, Rongyou 918 and Rong 18 you198 with good yield performance can be preferentially selected for cultivation under late summer direct sowing pattern after harvesting rape or wheat in East Sichuan.