Determining the Soil’s Most Important Parameters Affecting the Water Erosion Intensity of Marl and Shale Formations of Sanganeh Region, Northeast of Khorasan Razavi Province of Iran

Soil is one of the most important effective factors in the soil erosion. This is the similar soil from the same grade in the soil classification system with relatively identical origin but different physical specifications show dissimilar behaviors vs. erosion. Because the physical quality along with other soil properties directly affects the retention and controlling of the nutrients, assigning proper attention as controlling and improving such factors and parameters will produce direct positive influence on the economical status of a society. Especial petrology texture of the region (geological formations) and abundant faults and consequently limited lithologic variations in small scale in addition to dry to semi dry climatic conditions of the region makes it a good exceptional sample, representing other parts of the country with identical features, so that the results could be generalized to the other parts of the country. The parameters being investigated in this study are: the soil texture, saturated moisture and saturated extract of the soil, electrical conductivity of the soil, the sodium solution of the soil, calcium solution of the soil, the lime, and the soil organic materials. The attempt has been made, through determining the ratio of the mentioned materials, their influence in the erosion process of the area and the correlation among them is evaluated.