栽培因子对棉株不同座果点主要农艺及经济性状影响的研究

Studies on Effects of Cultural Factors on Main Agronomic and Economic Characters of Different Fruiting Position in Cotton

采用二次回归组合设计的最优混合设计(311设计),探讨了栽培因子与棉株不同座果点主要农艺及经济性状的量化关系。分析结果表明,对4个不同座果点及3个不同部位贡献率经显著性差异检验都达到显著水平的基础上,第二果节棉铃对纤维品质与产量的贡献率最大,分别达到30.13%和31.74%;中部果枝棉铃对纤维品质与产量的贡献率也最大,分别为36.30%和37.74%,并在湖南特殊的环境条件与栽培技术体系下建立了3个栽培因子对纤维品质与产量影响的回归模型。

By using non-Linear regression orthogonal combination design (the optimum mix design),the effects of cultural factors on main agronomic and economic characters of different fruiting nodes were analyzed. The result showed the contribution rate of four different fruiting positions and three distinct places reached the significance levels through LDS. The contribution of bolls on 2^(nd) fruiting position to the fiber quality and yield is the biggest,the contribution rate reached to 30.13% and 31.74%; and the contribution of middle branches to the fiber quality and yield is the biggest, the contribution rate reached to 36.30% and 37.74%.The regression model between cultivation factors was established with fiber quality and yield under the condition of special ecosystem and cultivation, in Hunan,the model that the highest fiber quality can be obtained is sowing at April 23^(th), 24000 plants·hm^(-2), dressing N 330 kg·hm^(-2) ,the model that the highest yield can be obtained is sowing at April 17-18^(th), 24000 plants·hm^(-2), dressing N 260 kg·hm^(-2) .