Effect of weather temperature and solar radiation on grain yield and yield components of rice under different local climates in Mazandaran province

This study aimed to investigate the effect of different local climates on grain yield (GY) and yield components (YC) of two different rice cultivars (cvs. ‘Tarom Hashemi’ and ‘Shiroudi’) and also to quantify the relationships between GY and YC with the average of weather temperature (T, °C) and solar radiation (SR, MJ m-2 d-1) during the growing season of rice. Three field experiments were conducted separately based on the randomized complete blocks design with four replications, at the paddy fields of Babolsar, Amol and Polesefid cities in northern Iran in 2014. The results indicate that the effect of different local climates were statistically significant on GY, the number of panicles, length of panicle, weight of panicle, total number of grain in each panicle and the number of filled grain (P