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Two effective methods have been established recently in order to diminish on the clay soils of South Finland the injuring of cereals by spring and early summer droughts; placement offertilizer and sprinkler irrigation (Pohjanheimo and Heinonen 1960, Heinonen and Nieminen 1961, Larpes 1966, 1967, Nieminen et ai, 1967, Elonen et ai, 1967, Aura 1967). The former method is already widely adopted by farmers, but only a few of them have accepted the latter. In the sprinkler irrigation technique as well as in the technique of fertilizer placement there are, however, many unsolved problems, e. g. which is the best mutual position for fertilizer and seed under Finnish conditions. Questions of this kind cannot be solved without extending the investigations also to the underground parts of plants, towards which the irrigation and placement of fertilizer is primarily directed. The purpose of the present work was to study the development of the root system of spring cereals during the growing season, the effect of fertilizer placement and irrigation on the correlation between the yield and the root system, and on the distribution of the root system in the ploughed layer.

Effect of placement of fertilizer and sprinkler irrigation on the development of spring cereals on the basis of root investigations