剪顶对高密度麦后直播短季棉产量和有效铃空间分布的影响

Effects of top pruning on yield and effective boll distribution of short-season cotton cultivars seed-planted with high density after wheat harvest

研究了剪顶对清水和棉太金调控下高密度麦后直播不同短季棉品种的产量和有效铃空间分布的影响。结果表明,与传统人工打顶相比,剪顶对子棉产量的影响因品种不同、是否使用调节剂而异,并未导致一致的减产,且对皮棉的影响小于对子棉的影响;相对于清水对照,使用棉太金条件下,剪顶副作用小,对有的品种呈现增产效果,剪顶更容易影响单株上层(≥2层)和外围(≥2节)铃数、铃重、子棉产量。

This work studied the effects of plant top pruning on the yield and space distribution of effective bolls for different high density short-season cotton cuhivars seed-planted after wheat harvest, respectively, under water and Miantaijin treatment during 2012-2013. Compared with conventional handed decapitation, pruning worked dependently on cuhivar types and use of Miantaijin, didn＇ t result in universal yield decrease, and had smaller effects on ginned cotton than seed cotton. Pruning had smaller negative effects under Miantaijin treatment than water control and increased yield for some cultivars under Miantaijin. It was susceptible to prune for upper （ ≥2 layer ） and outer （ ≥ 2 fruit branch node ） boll number, boll weight and seed cotton yield.