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为了研究滴灌条件下不同供水模式对棉花生长发育、耗水规律、产量及纤维品质的影响 ,1 997～ 1 998设置了 4种供水模式 ,即以当地畦灌条件下棉花多年平均逐月需水量 ( ET)为基础 ,各月灌水量分别设置为需水量的 85%、70 %、55%和 40 %。试验结果表明 ,棉花的株高、叶面积指数、果枝数、蕾铃数、铃重、耗水量和皮棉产量随供水量的增加而增加 ,衣分、整齐度、麦克隆值随供水量的增加有一定的递减趋势 ,但对其它纤维品质项无明显影响。通过综合评价认为 ,大田滴灌棉花供水量以需水量的 70 %为宜。在不考虑降雨的条件下 ,其供水模式为 :6月份 5d灌 1次、7月份4d灌 1次、8月份 5d灌 1次、9月份 7d灌 1次 ,每次灌水定额为 1 50 m3· hm- 2 。
In order to study the effect of different water supply patterns on cotton growth and development, water consumption, yield and fiber quality under drip irrigation, four water supply modes were set up from 997 to 1988. According to the monthly average monthly water demand of cotton ET), the monthly irrigation volume was set at 85%, 70%, 55% and 40% of the water demand respectively. The results showed that the plant height, leaf area index, fruit branch number, boll number, boll weight, water consumption and lint yield of cotton increased with the increase of water supply, and the percentage of clothes, uniformity and micronaire increased with the increase of water supply There is a certain trend of decreasing, but no significant effect on other fiber quality items. Through comprehensive evaluation, field water supply to drip irrigation cotton needs 70% of water is appropriate. Irrespective of rainfall conditions, the water supply pattern is as follows: one for 5d in June, one for 4d in July, one for 5d in August and one for 7d in September, with a fixed irrigation standard of 150m 3 hm-2.