抄録
The root samples were taken by Monolith method from plots to which fertilizer was applied in row and broadcast. The root distribution influenced by the method of fertilizer placement varied according to the kind of crops (Fig. 1). On the top and root growth of immature soybean, there was no distinct tendency between two fertilizer placements. In common vetch, the top and root growth was better in row application. In red clover, it was better in broadcast application. The most part of the roots distributed in 6 cm depth from the surface of the soil in immature soybean and red clover, and 15 cm in common vetch (Fig. 2). The root of immature soybean penetrated into the subsoil about 60 cm deep, but that of others did about 40 cm deep. In general the tap roots penetrated deeper in broadcast application (Table 1).
