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利用玉米为材料在砂培试验中设置了0，1．5，3．0，15mmol．L-14个钾水平，在玉米长至5叶期时分别转入生长箱中进行8℃，25℃两种温度处理4d，测定钾在植物水分调节中的作用。结果表明，在砂培条件下，适施钾肥增加了玉米地上部钾含量，同时地上部阳离子累积量显著增加，分别为常温下从缺钾处理（0）的1·55mol·kg-1增加到高钾处理（15mmol·L-1）的2．04mol．kg-1，低温下从1．41mol·kg-1增加到1．83mol．kg-1。经低温处理后植株叶片出现了程度不同的萎蔫症状，但施钾植株叶片萎蔫显著减轻，高钾处理植株的叶片萎蔫率较缺钾处理下降了16.4倍。施用钾肥也使植株的保水能力增强，相对含水量得到提高，改善了植株的水分状况。
Using corn as the material in the sand culture experiment set 0, 1.5, 3.0, 15mmol. L-14 potassium levels were transferred into the growth chamber at the 5-leaf stages of maize for 8 days at 25 ℃ for 4 days to determine the role of potassium in plant water regulation. The results showed that under the condition of sand culture, the application of K fertilizer increased the potassium content in above-ground parts of corn and the cumulant accumulation in above-ground parts increased significantly from 1. 55mol · kg-1 of potassium deficiency treatment (0) to High potassium treatment (15mmol · L-1) of 2.04mol. kg-1, increased from 1.41mol · kg-1 to 1.83mol at low temperature. kg-1. After low temperature treatment, plant wilts appeared different degrees of wilting symptoms, but the wilting of the leaves of potassium plants significantly reduced, and the wilting rate of high potassium plants was 16.4 times lower than that of potassium treatment. Potassium application also increased the water retention capacity of plants, relative water content was improved, improve the water status of plants.