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In order to determine the effect of three sowing dates and three seedling rates on agronomic characteristics of a lentil cultivar (Ziba), an
experiment was conducted in the agricultural farm of Tehran University at Karaj during 1992-1994. The traits studied were time from sowing to 50% !lowering, time from sowing to 90% maturity,100 seed weight (g), and seed yield (g/10mz). Simple and compound analysis of variance for seed yield
showed that varIOUS sowi,ng dates and sowing date x year interaction were significant at the 1 % level of probability. In these studies the optimum sowing
date was December and the best seedling rate was found to be 60 to 65 Kglha. Treatment means were calculated and compared, using Duncan's Multiple
Range Test.