抄録
This experiment has been carried out in order to clarify the effects of nitrogen supply on soybean plants to nodule formation. Particular attention is given to the mechanisum of inhibition on nodule formation by nitrogen over supply. 1) The nodule formation was inhibited with an accompanying increase of nitrogen supply and it indicated on nodule numbers and nodule weight per plant during the growing period. 2) Different nitrogen, levels in host tissues and culture media have no effect to activety and the penetration of Rhizobium japonicum (Table. I). 3) The nitorgen over supply induced higher concentration of total nitrogen and lower concentration of total suger and reducing suger in soybean root. Auther conclude that the reducing suger levels of host tissues control the nodule formation.
