棉花化学打顶剂在鄂东植棉区的应用效果

Application Effect of Chemical Topping Agent on Cotton in the Eastern Hubei

为了棉花生产的轻简化。以晶华棉116为例,设置了增效缩节胺(DPC)不同浓度(90 g/hm 2、180 g/hm 2、270 g/hm 2)处理进行棉花打顶试验示范。结果表明,喷施DPC能够控制棉花新生主茎长度和株高,提高籽棉产量、单铃重和断裂比强度;中低浓度(90 g/hm 2和180 g/hm 2)处理对棉花单株结铃数、衣分影响不明显,但高浓度(270 g/hm 2)处理会降低棉花的单株结铃数、衣分。建议在鄂东植棉区生产中喷施DPC 90~180 g/hm 2进行棉花化学打顶。

In order to simplify cotton production,taking Jinghua 116 as an example,different concentrations of DPC(90 g/hm 2,180 g/hm 2,270 g/hm 2)were set up for cotton topping experiment.The results showed that spraying DPC could control the length and height of new main stem,increase seed cotton yield,single boll weight and breaking strength of seed cotton.Low and medium concentration(90 g/hm 2 and 180 g/hm 2)treatments had little effect on the number of bolls per plant,lint percentage,but high concentration(270 g/hm 2)treatment could reduce the number of bolls per plant,lint percentage.it is suggested to spray DPC 90~180 g/hm 2 for chemical topping in the cotton planting area in the Eastern of Hubei.