Abstract
1. Some experimental researches on the ground water bearing upon the root development of fruit trees were carried out by the present authors in 1949 and 1950.
2. The level of the ground water in an orchard which was surrounded with the paddy field varied with the condition of irrigated water in paddy field.
3. Grape was resistant to the underground stayed water, Mituba- and Maruba-Kaido (apple stocks) was medium and persimmon was weak. Red-clover and hairy-vetch (leguminous green manure) was seemingly resistant to the underground stayed water, but potato was very weak.
4. A distinct difference in the growth of top and root was observed between the plot of lower ground water and that of higher. The high level of ground water limited not only the length of roots but also the growth of top, especially in the case of subsoil to 20cm.
