栽培因子对抗虫杂交棉棉铃形成时空分布的影响

为探索抗虫杂交棉高产栽培技术途径，采用多因子最优混合设计(311设计)研究了播期、栽培密度和施氮量对抗虫杂交棉农杂62棉铃形成时空分布的影响．结果表明，播期对棉铃时间分布影响最大．随播期推迟．成铃高峰推迟．秋桃比例增加．而伏桃和伏前桃比例减小；施氮量影响次之，施N量增加，秋桃比例增加；密度影响最小．试验因子对棉铃空间分布均有较大影响，播期推迟，棉株下部内围铃比例增加．上部及叶枝铃比例减小；施N量增加．上部及外围铃比例增加，中下部铃比例减小；密度增加．叶枝铃及外围铃比例显著减小．各试验因子对棉铃形成时空分布的影响有互作效应．

Effects of Cultural Factors on Spatio-Temporal Distribution of Bolls in Bollworm-Resistant Hybrid Cotton

An optimal of multiple factorial experiment is applied for the effect of sowing date, planting density and nitrogen applying rate on spatio-temporal distribut ion of cotton bolls are studied by using hybrid cotton variety Nongza62,in orde r to find out an approach to high yield culture in bollworm-resistant hybrid co tton.Results show:the peak of fruit is postponed and ratio of autumn boll to to t al bolls increase with the delay of sowing date, while the ratio of pre-hot-se asonal boll and hot-seasonal boll to total bolls decrease.Meanwhile, the perce ntage of autumn boll increases with the increase of N application. The three cul tural facts all affect the space distribution of cotton bolls significantly. The proximal boll ratio of lower fruiting branches increases while the percentage of bolls on vegetative branches and top fruiting branches decreases with the del ay of sowing date.With the increase of N application, the ratio of top boll and distal boll increases while the ratio of basic and base-middle bolls decreases. The percentage of bolls on vegetative branched and on distal position decreases significantly. There are mutuals effects of the three cultural facts for the ef fect on space distribution and temporal distribution of cotton bolls.