Ehsan Kamali

Crop yields are dependent on a number of factors such as soil type, weather conditions and farming practices. Crop yield estimates in different soil types are required to meet the needs of farmers, land appraisers, and governmental agencies in Iran as around the world. This study was conducted to model the wheat-grain yields [Triticum aestivum L.] by soil properties in Khoy area, the north-west of Iran. The wheat yields (mean of 5 years) were applied to predict and model the wheat yields under an average level of management used through the area. The prerequisite data on main soil physicochemical characteristics was collected and measured to clarify the correlation and multiple regression analysis which are used to establish the relationships between the soil properties and the wheat-grain yields. Based on the calculated soil index, the general equation (GE) taking the soil index ranging from 0 to 100 % into account was proposed to predict the wheat-grain yields applicably. The resu...