A pot experiment carried out in a greenhouse in 1999-2000 was aimed at finding the effect of a constant magnetic field on the root system and green tops, as well as on yield of spring wheat. In all cases there was observed a slight stimulating effect of the factors examined. The growth dynamics were weakened. The plants were shorter, and so were their culms and ears. Moreover, the effect of a magnetic field on the crop of spring wheat and its structure was small.