The changes in air humidity, CO2 content, light availability, water and nitrogen (N) content in the soil around isolated plants were determined and anahzed in spring wheat, broad bean and apple plant. The coefficient (a) of ecological effect of each factor, which was defined as a rate of biomass increase per day due to the change in an ecological factor, was measured. The law of distribution of synthetical ecological effect in the spactial distance away from the plant studied was obtained as follows.It inhi...