Abstract
1. The effect of growth substances upon the growth or potato plants were examined these few years. The results of 3 years (1945-1947) were reported here. 2. The seed pieces of potato were treated by 0.01, 0.005, 0.002 and 0.001% solution of α-naphthalene acetic acid and heteroauxion 0.5, 1, 3 and 24 hours. 3. In general, no significant effect in tuber production of potato tubers have been obtained as indicated the positive and negative reports to growth sutbstance treatment.
