Effects of planting date and different nitrogen levels on Linseed (Linum usitatissimum L)

In order to investigate the effect of sowing date and different nitrogen levels on quality and quantity characteristics of Linseed, an experiment performed in split plot in form of Randomized Complete Block Design, with 4 replication and during 2005-2006 and 2006-2007 in Yasouj Agriculture Research Station. 5 sowing date included 10 March,1,10 and 20 April and 1 May in main plots and 4 fertilizer levels in subplots included 0, 50, 100 and 150 kg/ha pure N from urea fertiliser that 50% was applied at sowing and 50% as top-dressing. The results of 2-year analysis of data indicated that with delayed sowing, plant height, number of branch, number of fruits, grain yield, 1000 seed weight, leaf area index, dry mater, crop growth rate and oil percentage were reduced significantly. The use of 100kg/ha N significantly increased plant height, number of branches, pod of fruits, grain yield, leaf area index, dry mater, crop growth. First sowing date with 1801.12 kg/ha had the most yield and fifth sowing date with 760.48 had the least yield. The most and the least yield rate of grain in 100kg/ha N and control were 1895.22 and 1351.87. The most oil was 34.6% that obtained in the first date of sowing. The first sowing date with 52.38% produced the most and the fifth sowing date with 50.58% produced the least acid linolenic. The sowing date had no significant effect on acid oleic and acid linoleic. The most acid linolenic 52.64% and acid linoleic 15.36% were obtained by the use of 150 kg/ha N and the most acid oleic 20.59% were obtained without N.