Effect of GA3 and Urea Treatments on Improvement of Microtuber Production and Productivity of Different Types of Planting Material in Greater Yam (Dioscorea alata L.)

An experiment was under taken to study the effect of different concentrations of urea and GA3 treatments on the improvement of microtuber production in the vine cuttings of Dioscorea alata L. From the experimental finding it was observed that Urea 2% and GA31ppm treatment shows better response for days taken for rooting, root length, number of roots per cutting survival % in the field and nursery condition and mean number of micro tubers production per cuttings. Similarly for productivity study and observations on all other vegetative and tuber characters were highest in planting of whole tubers (200 gm) followed by planting of whole tubers (150 gm) and cut tubers of 50 gm. The value for all the observations was lowest in planting of rooted vine cuttings.