Some problems on the farm irrigation (1)

Even where there is enough rainfall with proper seasonal distribution, every few years dry spell upsets nature and crop is lost. In such a year farm irrigation is very effective.Our experiment was made in summer of 1953 under unfavorable weather conditions using an upland rice at the field of Tokyo University of Agriculture and Technology, so as to clarify the effect of farm irrigation. We could not get good results to demonstrate the effectiveness of the farm irrigation from our experiment, but designate the differences of soil water content and soil constitution between the irrigated plot and the cultivated one, as shown in Fig. 3.