Abstract
It hlas been denionstrate(l e.g. by Weaver (16) anl Tourmey (14), that root development is generally favored undler moist conditions in the soil-excepting where there is excess water-while dry conditions result in a poorer development of roots. This high degree of dlependency of root growth on soil moisture causes the root system to follow closely the changing water content in the soil. Moist soil zones are, therefore, rapidly interspersed wvith roots and thus utilized by the plant.