【摘要】 采用2年大田试验方式,研究不同钾肥施用位置对产量、三桃数、生殖器官数、脱落率和有效果枝数的影响。结果表明,施用钾肥使棉花产量增加12.4%~28.1%,8月15日的桃数增加23.3%~41.7%,9月15日的桃数增加30.2%~48.0%,生殖器官数在7月15日、8月15日和9月15日分别增加17.9%、22.1%和36.5%,脱落率在8月15日盛桃期和9月15日收获期分别降低34.8%和24.8%;不同钾肥施用位置的产量高低顺序为T10,20(钾肥水平距离10 cm、垂直距离20 cm)>T20,10(钾肥水平距离20 cm、垂直距离10 cm)=T20,20(钾肥水平距离20 cm、垂直距离20 cm)>T10,5(钾肥水平距离10 cm、垂直距离5 cm)>T10,10(钾肥水平距离10 cm、垂直距离10 cm)>T20,5(钾肥水平距离20 cm、垂直距离5 cm)>CK(不施钾肥),钾肥施用位置T10,20、T20,10和T20,20的秋桃数和生殖器官数最高、T10,20和T20,20的脱落率最低,表明钾肥施在水平距离10 cm、垂直距离20 cm,水平距离20 cm垂直距离10和20 cm有利于增加桃数和生殖器官数,降低脱落率,从而提高产量。更多还原

【Abstract】 The field trial was conducted for 2 years,and the effects of different potassium placement sites on the lint yield,bolls number,reproductive organs number,boll dropping rate and effective fruit branches were studied. The results showed that the lint yield increased by 12.4% ~28.1% by application of potassium,and increased the bolls number on August 15 and September 15 by 23.3%~41.7%,30.2%~48.0%,respectively. The reproductive organs number were increased by 17.9%,22.1%,36.5% on July 15,August 15,September 15,respectively. Whereas the boll dropping rate were decreased by 34.8% and 24.8%on August 15 and September 15,respectively. The lint yield decreased in the order of T10,20(horizontal distance of 10 cm,vertical distance of 20 cm)>T20,10(horizontal distance of 20 cm, vertical distance of 10 cm)=T20,20(horizontal distance of 20 cm, vertical distance of 20 cm)>T10,5(horizontal distance of 10 cm, vertical distance of 5 cm)>T10,10(horizontal distance of10 cm, vertical distance of 10 cm)>T20,5(horizontal distance of 20 cm, vertical distance of 5 cm)>CK(without potassium).Potassium placement sites T10,20,T20,10 and T20,20 had the highest bolls and reproductive organs,T10,20 and T20,20 had the lowest bolls dropping rate. It demonstrated that placing potassium at the horizontal distance of 10 cm vertical distance of 20 cm,horizontal distance of 20 cm vertical distance of 10 and 20 cm were beneficial to increase boll number and reproductive number,which decreased boll dropping rate, thereby increased the lint yield.更多还原