Abstract: the sand culture, solution culture and isotopic experiment has been used to study the effect of potassium application on plant growth, nutrient uptake, physiological metabolism and chilling resistance in growth incubator and green house.The results demonstrated that the chilling stress strongly inhibited shoot growth and mineral nutrient uptake of maize plant , and caused certain water stress. Application of fertilizer potassium resulted in significant Increase in the content of potassium in plant...