盆栽试验表明，在水分胁迫下，新陆早４号的渗透调节能力较系５的渗透调节能力强，两品种的渗透调节能力均随水分胁迫程度的增加而提高。由光合强度的日均值变化可知，渗透调节能力在轻、中度水分胁迫下，可考虑将其作为棉花抗旱性强弱的一个指标。 Pot experiments showed that under water stress, the osmotic adjustment ability of Xinluzao 4 was stronger than that of 5, and the osmotic adjustment ability of both cultivars increased with the increase of water stress. From the daily average change of photosynthetic capacity we can see that the ability of osmotic adjustment in light and moderate water stress, consider it as an indicator of the drought resistance of cotton.