Document Type : Research Paper


1 MSc of Agronomy, Department of Seed Quality, Rice Research Institute of Iran, Deputy of Mazandaran, Amol, Iran.

2 Associate Professor, Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

3 Assistant Professor, Rice Research Institute of Iran, Deputy of Mazandaran, Amol, Iran.

4 Assistant Professor, Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.


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 indicated 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 < 0.01). In all traits, the values related to Polesefid were lower than both Amol and Babolsar which can be resulted in lower T and SR during the rice growing, especially in the reproductive stage. Decline in T and SR due to increasing in the above mean sea level were cased a decrease in GY and biological yield of both cultivars (about 10-25 percent, depending on the cultivar). In addition, GY was affected by decrease in T more than SR. Consequently, the results shown that we simply can quantify the variation in GY in both cultivars under different local climates and also can calculate a possible reduction in GY due to the delay in transplanting.


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