中文摘要：

以水培方法研究钠钾替代对棉苗生长、叶片光合性能和糖类代谢的影响,设全K、2/6K、2/6K＋4/6Na、1/6K、1/6K＋5/6Na共5个处理。结果表明：与全K相比,缺钾显著降低棉苗的相对生长速率、干物质质量、叶片钾钠积累量和净光合速率,而缺钾补充钠后各指标均有不同程度的提高。其中,2/6K＋4/6Na比2/6K处理的地上部相对生长速率和干物质质量分别提高21.05%和11.99%,叶面积、净光合速率、叶片淀粉含量和钾、钠积累量分别增加4.76%、18.23%、38.60%、30.54%和27.82%。另外,1/6K＋5/6Na比1/6K处理的各个指标也有不同程度的增加。

英文摘要：

To examine the effects of potassium（K） and sodium（Na） on cotton seedling growth, photosynthetic performance, and carbohydrate metabolism, a pot experiment was conducted with five treatments： K, 2/6K, 2/6K＋4/6Na, 1/6K, and 1/6K＋5/6Na.Potassium deficiency significantly reduced the aboveground relative growth rate and dry weight of cotton, as well as potassium and sodium accumulation in leaves, net photosynthetic rate, and leaf area. However, we observed different degrees of improvement for all of these indices when sodium was added. Meanwhile, 2/6K＋4/6Na treatment resulted in a higher shoot relative growth rate and dry weight by 21.05% and 10.00%, when compared with 2/6K treatment. Leaf area, net photosynthetic rate, leaf starch, and leaf accumulation of potassium and sodium were also higher by 4.76%, 18.23%, 160.52%, and 30.54%, respectively.Similar improvements were observed with 1/6K＋5/6Na treatment when compared with 1/6K treatment for each measured index.