Abstract
1. It was recognized that every treatment to soak the young plants of mat-rush for 24 hours in 0.001 %, 0.0001 % and 0.00001 % solution of α-naphtalene-acetic acid soda was effective for promoting root formation. 2. In 1951, the young plants grown in a paddy field were used. In l952, the young plants got from an upland field were used. In the former case, the effect was more distinct than in the latter. 3. In higher concentrations such as 0.01 % of the solution, the young plants obtained from a paddy field were registant and the number of roots formed was as large as that of the young plants of the untreated plot, while the young plants from upland field has resulted in very poor root formation.
