The Effect of Phosphorus and Transplanting Date on Growth, Yield and Yield Components of Onion (Allium Cepa L.) Under Irrigated Conditions at Adami Tulu Jedo Kombolcha Woreda, Oromia Region

A field experiment was showed to decide the influence of transplanting date and phosphorus level on growth, yield and yield component of onion at Adami Tulu Jedo Kombolcha Woreda during 2017/18 season. The treatments comprised of three transplanting date (42, 49 and 56 days of transplanting date) and phosphorus levels (0, 23, 46, and 69 kg P2O5 ha-1). The experiment was laid out in RCBD with four replications. In this study, transplanting at 56 days of transplanting date fertilized with 69 kg P2O5 ha-1 recorded the highest total bulb yield and marketable bulb yield, but no significant difference was showed with that obtained at 46 kg P2O5 ha-1 with the same transplanting date. The economic analysis revealed that the highest net benefit with low cost of production was obtained in response to the application of 46 kg ha-1 and the transplanting age of 56 days. Keywords: bulb yield, Onion, economic analysis, phosphorus, transplanting date. DOI: 10.7176/JBAH/11-1-03 Publication date: January 31st 202