Influence of different levels of nitrogen, phosphorus and potassium on yield and yield components of flax seed oil (Linum usitatissimum L.) variety Lirina

In order to study the effect of different levels of nitrogen, phosphorus and potassium on the quantitative characteristics of oil flax seed oil an experiment was conducted in agricultural research farm Abouraihan Tehran University, at 2009. The experiment was designed as factorial based on randomize complete block (RCB) with three replications. Different levels of nitrogen fertilizer consisted of three levels (N1=30, N2=60, N3=90 kg.ha-1) and three levels of phosphorus fertilizer (P1=40, P2=80, P3=120 kg.ha-1) and three levels of potassium (K1=40, K2=80, K3=120 kg.ha-1), were applied respectively. Traits, branch number, capsules number, number of seeds per capsule, weight of 1000 seed and seed yield was studied in this experiment. The results showed that 90, 120, 80 kg.ha-1 of nitrogen, phosphorus and potassium significantly increased the branches number, capsules number and seed yield. Based on the results mean grain yield was obtained (2384.28 kg.ha-10).   Key words: Nitrogen, phosphorus, potassium, seed yield, flax.