Effect of Different Planting Densities and Irrigation Managements on Rice (Tarom Hashemi Variety) Yield and Yield Components in Kooshal Lahijan Region, Guilan Province

In order to study the effect of different irrigation managements and planting densities on Tarom Hashemi cultivar, an experiment was conducted in a randomized complete block design (RCBD) with three replications at Koshal-Lahijan in north of Iran during cropping seasons of 2014 and 2015. There were 5 levels of irrigation treatments in this research including: I1 = Full irrigation, I2 = Saturation, I3 = Irrigation with 8 days alternative before anthesis, I4 = Irrigation with 8 days alternative after anthesis, I5= Irrigation with 8 days alternative whole growth season) and there were 3 levels of density including, D1=15×15, D2=20×20, D3=25×25cm. Evaluation of calculated and measured yield was done with adjusted coefficient of correlation; T test of means; and by absolute and normalized root mean square errors (RMSE). Combined variance analysis showed that the effect of irrigation treatment and plant density on measured traits were significantly different (p