Mathematical Simulation of Climate Change Effects on Chickpea Production in Gonbad

The purpose of this study was to identify the effects of climate change on growth, development and yield of chickpea (Cicer arietinum L.) in Gonbad city in order to adapt and improve yield for future conditions. In this study scenarios of increasing temperature by two, four and six°C, increasing Co2 concentration by two percent and reducing rainfall by two percent alone and combined with each other on December, January and February planting dates for rainy and irrigated conditions. Using SSM-iLegume-Chickpea simulation model were investigated. The results showed that increasing the temperature alone in future climatic conditions will significantly decrease chickpea growth, which leads to premature and non-contact with end-season drought stress and yield increase in dry conditions. However, under irrigated conditions, crop yields decrease due to reduced growth period under water limitation conditions. Increasing Co2 concentration alone due to its effective role in photosynthesis, reduced transpiration and increased water use efficiency increased grain yield in rainfed conditions by 23.9 percent and 12.3 percent under water conditions, but under combined effects scenarios under rainfed conditions, temperature It increases grain production doubly, but under aqueous conditions the temperature increases, counteracting the increase in production due to increased Co2 concentration. Comparison of planting dates also showed that December planting date had higher yield in both dry and irrigated conditions compared to January and February.