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在大田试验条件下,研究施钾量对杂交棉金102、湘杂棉8号、泗阳328的产量和品质及钾肥利用效率的影响。结果表明:施钾(K2O)量为135～270 kg/hm2,可增加皮棉产量39.13%～57.48%,达极显著水平;单株成铃数、单铃重、衣分分别提高14.24%～40.29%、3.59%～15.51%、0.16%～4.89%;纤维长度、比强度随施钾量增加而增加,对麦克隆值无显著影响。施钾量由135 kg/hm2增加至270 kg/hm2时,钾肥偏生产力(PFPk)降低45.93%～48.01%,钾肥农学效率(AEk)降低37.0%～42.9%。金102的钾肥农学效率(AEk)最高,施钾增产效果最好;泗阳328耐低钾胁迫能力最强,不施钾肥时,皮棉产量分别较湘杂棉8号、金102高5.54%、11.19%。
Under the field experiment conditions, the effects of potassium application on the yield, quality and potassium use efficiency of hybrid cotton 102, Xiangzamian 8 and Siyang 328 were studied. The results showed that the yield of lint was increased from 39.13% to 57.48% with the K2O content of 135-270 kg / hm2, reaching the extremely significant level. The number of bolls per plant, boll weight and lint percentage increased by 14.24% -40.29 %, 3.59% -15.51% and 0.16% -4.89% respectively. The fiber length and specific intensity increased with the increase of potassium application, but had no significant effect on the micronaire value. When K application increased from 135 kg / hm2 to 270 kg / hm2, PFPk decreased 45.93% ~ 48.01%, and AKk decreased 37.0% ~ 42.9%. Jin 102 had the highest agronomic efficiency (AEk), and had the best effect of increasing potassium yield. Siyang 328 had the strongest tolerance to low-potassium stress. When no potassium was applied, the lint yield was 5.54% higher than that of Xiangzaocian 8 and Jin 102, respectively. 11.19%.