Effects of land use and land slope on modulus of Soil erosion in Pasture lands

Soil Erosion is one of the affecting factors on the global equation of soil erosion at amount of soil losses that its study and determining it can be important. Erosion is Quality and quantity expression of certain soil desensitization to detachment and transferring by rain and runoff. In this study, by using Wischmerer monographs and related equation, condition of soil erodibility of Taleghan Zidasht on different land usage slopes were determined and the effects of land usage, slope and mutual effects between these two factors on soil erodibility was evaluated, these lands containing pasture at three different slope Levels3-8% 8-18% - 18-40% were collected and samples of soil with 3 replications were collected. Undisturbed samples were used to measure apparent density, Level of soil structure in the area was determined. Soil Magnitude permeability was determined by double cylinder with two replications. By using acquisition data soil samples erodibility Coefficient was evaluated using the Wischmerer formula. All data were analyzed using SAS software. Furthermore, it became clear that by increasing at each user, the rate of soil erosion increases. Comparison of slop effect medium and different agricultural applications are as follows: Erosion on pasture usage will increase by increase of slope Coefficient that this increase statistically was significant at the one percent. Erosion with increasing Coefficient of land slop located at 8-18%, have the highest erodibility that this result represents critical danger of slope is in this level. Situated lands in 18-40 % have the lowest amount of erodibility that this result could be due to the occurrence of erosion in earlier times.