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控制供水处理后，棉花叶片的光合作用发生差异，４个处理叶片的光合作用都有午休现象发生，较高的土壤含水量，并没有消除午休现象的发生，较低的土壤含水量对午休也没有延长的作用，但土壤干旱明显影响了棉花的光合作用（Ｐｎ），午休期间，光合作用降低幅度较大。当土壤含水量较低时，叶片的蒸腾速率（Ｔｒ）也有较明显下降的趋势。大水供应，虽然使棉花的水分利用效率（ＷＵＥ）有所提高，但其产量相对较低。充分供水使棉叶的光合生理处于较好状况，但其产量并不高。适水处理和适水偏旱处理，对增加产量和提高水分利用效率都是有意义村。
After controlling the water supply, the photosynthesis of cotton leaves differed. The photosynthesis of the four treatment leaves all had the phenomenon of lunch break. The higher soil moisture content did not eliminate the phenomenon of lunch break. The lower soil water content had no effect on lunch break No effect of extension, but soil drought significantly affected the photosynthesis of cotton (Pn). During the lunch break, photosynthesis decreased greatly. When the soil moisture content is low, the transpiration rate (Tr) of the leaves tends to decrease obviously. Large-scale water supply, although the water use efficiency (WUE) of cotton has increased, but its yield is relatively low. Full water supply to photosynthetic cotton leaves in good condition, but its yield is not high. Adaptation of water treatment and adaptive drought treatment, to increase production and improve water use efficiency are significant villages.