Effect of seeding rate and nitrogen levels on agronomic characteristics and nitrogen use efficiency of barley cultivar (MB-82-12)

The barley is one of the most important cereal crops. In order to study the effect of seed rate and nitrogen levels on agronomic characteristics and nitrogen use efficiency of barley, this study was carried out in Aran and Bidgol region in 2014. A factorial arrangement of treatment in a randomized complete block design with four replications was used. Seed rate treatment (S1= 150, S2= 225, S3= 300 kg ha-1) and nitrogen levels treatment (N1= 0, N2= 75, N3= 150 kg ha- 1), were assigned in plots. Each plot consisted of 6 row, 5 m long with 50 cm between rows space and 5 cm between plants on the rows was used. In this study Plant height, number of fertile tiller, 1000 grain weight, number of grain per spike, grain yield, harvest index, protein percent, nitrogen use efficiency, nitrogen appear recovery and amount of nitrogen absorbed were assessed. Results indicated that the interactin effect of seed rate and nitrogen levels treatment on the characteristics such as: nitrogen use efficiency and nitrogen appear recovery was significant. The maximum and minimum of nitrogen appear recovery with average (0.44 and 0.14 %) were obtained by the treatment (150 kg ha-1 of seed + 75 kg ha-1 of nitrogen application) and (300 kg ha-1 of seed + 150 kg ha-1 of nitrogen application), respectively.