In this research, the changes of two elements of precipitation and temperature and their effect on the yield of rice in the northern regions of Iran were investigated. To study the effect of climate change on rice production, climatic elements of temperature and precipitation were selected in three weather stations across the country according to their highest rice yield. For this purpose, three elements of temperature (maximum, minimum, and average), monthly rainfall during the plant growth period from March to September for 17 years of the statistical period from 2000 to 2017, and also rice yield data were used. Using the regression method and Man-Kendal analysis, the trend of changes and the time series of the studied elements were analyzed. Also, cross-tabulations were used to find the most important elements influencing rice yield. The results showed that the highest yield occurs in high temperatures and precipitations. The yield of rice is facing a decrease in quality and an increase in quantity in terms of yield.

Professor Manuchehr Farajzadeh starts his work in Tarbiat Modares University since 1985. He selected biggest researcher of Iran in 2015 with Iranians President letter. Teaching of different course of climatology, remote sensing and geographic information system, hydrology and environmental planning in Iranian universities is his educational activities. He published 12 books in Persian, more than 55 international papers, 150 internal papers, more than 50 paper in conferences and more than 200 master and PhD thesis supervised. He supervised 20 applied projects in Iran.