The interaction effects of variety and plant density on harvest index, indicated significant (p<0.001) variation, while grain yield showed statistically significant (p<0.01) variation, likewise biomass yield and straw yield indicated significant (p<0.05) variations. Number of seedlings and harvest index resulted in (25.31) and (44.05) respectively. The main effect of plant population on number of seedlings and harvest index showed significant (p<0.01) variations. The use of 300 plants m-2 plant density for the variety Hidassie /large seed size/ resulted in highest seedling number (26.30), of tillers (7.50), days to 50% of heading (63.00), days to 50% of maturity, (116.00), spike length, (7.50 cm), thousand kernel weight (48.22 gm.), hecto liter weight (78.30 kg/hL). ![]() The main effect of the varieties seed size on days to 50% of heading, days to 90% of maturity, thousand kernel weight and hecto liter weight showed significant (p<0.01) variations, while number of tillers and spike length indicated statistically significant (p<0.05) variations. With November the objectives of to determine the optimum plant density levels of bread wheat by identifying the most cost-effective variety, a field experiment was conducted at Kulumsa Agricultural Research Center from June to 2018 cropping season, Three bread wheat varieties (Hidassie, Dendea and Shorima) representing different seed sizes of large, medium, small, respectively and four plant density levels of 250, 300, 350 and 400 plants m-2 were tested.
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