A decrease in the magnitude of atmospheric electric factors by screening the plants with an earthed metallic mesh resulted in unfavorable changes in maize plants. Anatomo-morphological as well as physiologico-biochemical properties of the plants were affected. The growth and development rates decreased; accumulation of mineral elements was also lower and the ratio of the elements accumulated changed. The decrease in the K/Ca ion ratio is ascribed to changes in the colloid-chemical properties of protein structures and to changes of electrophysiological processes. Decrease of the phosphorus content is related to violation of energy transfer processes.