Abstract
Previous year, the fundamental studies of the secondary growth of potato tubers, that was one of the most serious drowback in cultivation and utilization of potato in Hokkaido, were carried on by the water culture method. In this experiment now the changes of concentration of culture solution and the duration of treatment affect to the secondary growth of potato tubers were examined. In this experiment we obtained the results that the secondary growth of potato tubers was induced by the treatment of 24, 48 and 72 hours with 25 times and 24 and 48 hours with 50 times normal concentration of culture solution, but the plants which were treated 72 hours with 50 times and 24, 48 and 72 hours with 100 times normal concentration of culture solutioh were killed.
