【摘要】 为了明确脱叶效果较好且产量较高的滴灌频次,研究了不同滴灌频次对化学脱叶棉花土壤含水率、叶绿素荧光参数、脱叶效果及产量品质的影响。试验结果表明,滴灌频次7次(D7)处理为棉花生育后期提供较适宜的土壤含水量且有效调节20～40cm土层的土壤水分,调节化学脱叶棉花叶片荧光参数和产量,适当降低光合活性,促进棉花脱叶率与吐絮率增长,且降低挂枝率16.12%～24.95%,从而使产量增加7.61%～15.99%,同时纤维长度和纺织一致性分别增加了1.91%～3.87%、4.58%～14.72%。因此,滴灌频次为7次(D7)更适宜南疆化学脱叶的等行距机采棉种植。更多还原

【Abstract】 In order to determine the frequency of drip irrigation with better defoliation effect and higher yield, the effects of different frequency of drip irrigation on soil moisture content, chlorophyll fluorescence parameters, defoliation effect and yield and quality of chemical defoliated cotton were studied. The results showed that 7 times of drip irrigation(D7) could provide suitable soil water content for cotton growth at later stage and effectively regulate soil water content of 20-40 cm in soil depth, so that the fluorescence parameters and yield of chemical defoliation cotton leaves could be adjusted suitably. Photosynthetic activity could be reduced accordingly, the growth of defoliation rate and flocculation rate of cotton could be promoted and the branch hanging rate could be reduced by 16.12%-24.95%. In conclusion the yield was increased by 7.61%-15.99%, fiber length and textile consistency were increased by 1.91%-3.87%, and 4.58%-14.72%, respectively. Therefore, drip irrigation frequency of 7 times(D7) is more suitable for cotton harvesting in chemical defoliation machine in southern Xinjiang.更多还原