栽培因子对棉株蕾花铃形成时空分布影响的研究

本研究采用二次回归组合设计的最优混合设计(311设计)，在湖南特殊的环境条件与栽培技术体系下探讨了栽培因子对棉株不同座果点蕾花铃的影响．即伏前桃在总铃数中所占的比例随播期推迟而减少，随密度增大而略有增加，施氮量过多或过少均减少伏前桃的比例：秋桃的比例随播期推迟而增加，随密度增大反而降低，随施氮量的增加而增加，伏桃在总铃敷中的比例最高，各个处理平均达到62％左右。根据三桃的总数与比例得出处理3为较好的栽培模式，即播期为4月9日，密度为19755株／hm^2，施氮量为337．5kg／hm^22。

Studies on the effects of the cultural factors on the time and space distributionof squaring flowering fruiting in cotton

By using non-Linear regression orthogonal combination design ( the optimum mix design),the effects of cultural factors on squaring flowering fruiting of different fruiting nodes were analyzed under the condition of special ecosystem and cultivation in Hunan. the result showed the ratio of pre-hot-seasonal bolls to total number of bolls decreased with delay of sowing date, increased slightly with the increasing of planting density , decreased as N application higher or lower than optimal application rate . the ratio of autumn boll to total bolls increased with the delay of sowing date , decreased with the increasing of planting density (but while planting density was high enough ,the ratio increased to some degree ),increased as the increasing of N application .the ratio of hot-increased boll to total boll was highest ,the average value of different treatments is 62%. Through the number and ratio of three-boll can be obtained the better pattern to the handle 3,the result showed that sowing at April 9th,19755plant/hm2,337.5kg N/ hm~2.