Evaluation of different levels of nitrogen and complementary irrigation effect on grain yield and its components of rainfed barley, Sahand cultivar in Baft

In order to study the effects of nitrogen and complementary irrigation on yield and its components of rainfed barley Sahand cultivar، an experiment was conducted on split plot based on randomized completely block design with four replication in Baft area at 2009-2010. Factors were: four levels of nitrogen (0، 20، 40 and 60 kg/ha as pure nitrogen) from Urea source as factor B and four levels of complementary irrigation as factor A (I1: without irrigation، I2: irrigation at sawing date، I3: irrigation at anthesis and I4: irrigation at grain filling stage). The results showed that complementary irrigation has significant effect on grain yield، number of spike per m2، number of seed in spike، 1000 kernel weight، plant height and biological biomass. The maximum and minimum amount of grain yield was related to I2 (1810 Kg/ha) and I1 (1004 Kg/ha) respectively. Complementary irrigation had no significant effect on spike length، number of tillage and number of plant leaf. Nitrogen application on dry land conditions had high significant effect on grain yield and biological biomass. Nitrogen×irrigation interaction effect was not significant.