Yalew Teshome and Debebe Asfaw
A field experiment was concted in Harwa irrgation station in 2017/18 to assess effect nitrogen fetlizer to observe and intra-row spacing on yield and yield components of Adama Red onion (Allium cepa L.) experiment observe the effect of six N rates (0, 46, 69, 92, 115 and 138 kg ha-1) and four intra-row spacing levels (7.5, 10 12.5 and 15 cm) on yield and yield components of onion (Allium cepa L.). was laid out according to randomized complete block design in factorial arrangement with three replications. Results revealed that the interaction effects of N rates and intra-row spacing showed highly significant (p<0.01) effect on harvest index, fresh biomass yield, dry biomass yield, total bulb yield and marketable bulb yield.
The interaction effects of intra-row spacing and farmyard manure rates showed significant influence on biological, total, marketable and unmarketable bulb yields. Highest total bulb yield, 58.74 t ha-1 and marketable bulb yields 57.77 t ha-1 were obtained from plants spaced at 7.5 cm and plots received 30 t ha-1 farm yard manure. The highest weight loss and bulb rotting were observed at wider intra-row spacing (15 cm) and highest farmyard manure application, which was 30 t ha-1. Intra-row spacing of 7.5 cm and 20 the harvest index, fresh biomass yield total bulb yield marketable bulb yield .thus according to pant to plant was found best treatment than others in relation to yield to yield rate gave good marketable bulb yield and better storage life under the study area.
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