Effect of sowing date and nitrogen on yield, components yield and oil characteristic of medicinal flax

In order to investigate the effect of sowing date and different nitrogen (N) levels on quality and its features of medicinal flax, an experiment performed in split plot in form of Randomized Complete Block Design was carried out with 4 replications and during farming years 2005–2006 and 2006–2007 in Yasooj Agriculture Research Station. 5 sowing date included 4, 6, 8, 10, 12 on the basis of depth temperature of 5cm in main plots and 4 fertilizer levels in sub-plots included sample (no fertilizer) 50, 100 and 150kg/ha pure N from urea source that 50% was used at the time of sowing and 50% in the way of top-dressing. The results of complex 2-year analysis of data indicate 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 pure N significantly increased plant height, number of branch, number of fruits, grain yield, leaf area index, dry mater, crop growth [1]. First sowing date with 1801.12kg/ha had the most yields and fifth sowing date with 760.48 had the least product. The most and the least yield rates of seed in 100kg/ha pure N and sample were 1895.22 and 1351.87. At last, the most of seed yield rate is obtained 2135.26 and 2128.14kg/ha orderly in the first sowing date and the consumption of 100 and 150 hg pure N/ha and the least seed yield rate is obtained in the fifth planting date without the pure N consumption. The most oil rate was 34.6% that obtained in the first date. The first sowing date with 52.38% produced the most and the fifth sowing date with 50.58% produced the least linolenic acid. The sowing date had no significant effect on oleic acid and linoleic acid. The most linolenic acid 52.64% and linoleic acid 15.36% were obtained by the use of 150kg/ha pure N and the most oleic acid 20.59% were obtained without use of nitrogen [2].