Abstract
In order to gain the high yields of soybean at the volcanogenous soil region, we established the deep ditching cultivation method. This paper presents the results of studies about the adaptability of soybean varieties for this method from the standpoint of the plant nutrition. The study was conducted in field experiment, and in pot- and water-culture. As the result of these experiments, it was clarified that those varieties which gave high yields in this cultivation were not so affected by the poor nutrient condition of subsoil, and did not show marked yield depression in the case of defficiency of any nutritive element, particularly that of phosphorous.
