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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、15．0mmol／L4个钾水平，当玉米长至五叶期时分别进行8℃、25℃两种温度处理4天，测定了钾对玉米苗期抗冷性的影响。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。低温胁迫下玉米叶片质膜离子渗透率增加，施钾有利于质膜透性保持较低水平；15．0mmol／L钾处理叶片质膜的离子渗透率仅为不施钾处理的58％。与此同时，在低温胁迫下，高钾植株叶片过氧化物酶活性降低，萎蔫率明显下降，抗冷性增强。
In the experiment of sand culture, four potassium levels of 0, 1.5, 3.0 and 15 mmol / L were set in the sand culture experiment. When the corn was up to the five-leaf stage, temperatures of 8 ℃ and 25 ℃ After 4 days of treatment, the effect of potassium on chilling resistance of maize seedlings was measured. The results showed that under the condition of sand culture, the application of K fertilizer increased the potassium content of corn aboveground. Under low temperature stress, the permeability of plasma membrane to maize leaves increased, and the permeability of plasma membrane was kept at a low level when potassium was applied. The ion permeability of plasma membrane of 15.0 mmol / L potassium treatment was only 58% of that under potassium deficiency. At the same time, under low temperature stress, peroxidase activity in leaves of high-potassium plants decreased, wilting rate decreased significantly, and chilling resistance increased.