[en] The correlation analysis for the absorption and the distribution of ⁸⁶Rb and K and K by plant and their movements in the soil showed that the correlation is significant at each growing period of the plant, but their movement correlation in the soil is affected by the texture of soil and water conditions. The experiment with the tracer ⁸⁶Rb showed taht the movements of K(⁸⁶Rb) in the directions of length and breadth are slow in soil. The texture of soil and water condition affect on the movemet and fixation of K(⁸⁶Rb) in soil. The law of absorption of ⁸⁶Rb (K) by tomato, corn, sorghum, rad bean and kenaf etc. provides scientific basis for the proper fertilization