棉太金对麦后直播不同短季棉品种产量和株型的影响

Effects of Miantaijin on Yield and Plant Shape of Different Short-Season Cotton Cultivars Sowed after Wheat Harvest

2012-2013年在大田种植条件下,以短季棉常规品种百棉2号和中棉所50及杂交棉品种百棉3号为材料,在麦后直播和种植密度为15万株/hm2条件下,研究不同品种产量和株型对棉太金的响应。结果表明,3个品种子棉产量对棉太金的响应及同一品种子棉产量在不同年份对棉太金的响应不一致。棉太金显著减低了3个品种的株高和果枝长度,但抑制程度之间存在明显差异,百棉3号的株高受抑制程度最低;棉太金对3个品种的1-3台和4-6台果枝长度抑制效果显著,对百棉2号和中棉所50的≥7台果枝长度影响效果不显著,但显著降低了百棉3号的≥7台果枝长度;棉太金对3个品种的果枝台数、果节数和果枝始节节位影响效果不显著。

To investigate responses of the yields and the plant shapes of different short-season cultivars to plant growth regulator-Miantaijin under sowing directly after wheat harvest and planting population of 150000 plant /hectare, the conventional short-season cotton cultivars Baimian No.2, ZhongmiansuoSO and hybrid Baimian No.3 were used in the field during 2012- 2013. The results showed that there were different responses in yield to Miantaijin among three cultivars and one cultivar in different years. Miantaijin significantly inhibited the plant height and fruiting branch length of three cultivars. The inhibiting rates varied obviously among them, with minimum inhibiting rate for Baimian No,3. Miantaijin significantly suppressed the length of 1-3 fruiting branches and 4-6 ones of three euhivars, with no significant effects on length of ≥7 ones of Baimian No.2 and ZhongmiansuoSO, but significantly inhibited that of Baimian No.3. Miantaijin had no significant effects on fruiting branches, fruiting positions and position of first fruiting branch of three cultivars.