Quantifying the Effects of Physicochemical Soil Properties on Runoff and Soil Loss in Rainfed Wheat Cultivation Strips
Soil physicochemical properties are important variables in runoff production and soil loss. This research was conducted to find the most important soil properties affecting runoff and soil loss in rainfed wheat furrows under fallow condition. To this end, three rainfed landswith 15% slope gradient were selected in south west of Kermanshah province. In each land, furrows with 5 m in length and 30 cm in width were created using sowing set. Runoff and sediment were measured using simulated flows with a discharge of 0.5 and 1.5 lit.min-1 for 60 minutes in three replications. The results showed that in the two flow discharges (0.5 and 1.5 lit.min-1) runoff and soil loss are negatively correlated with clay, sand, soil permeability (If), organic matter and clay to silt ratio (p<0.01), while positive correlations were found between them and silt (p< 0.01) and bulk density (p< 0.05). The results of multiple linear regression analysis showed that runoff production and soil loss by a 0.5 lit.min-1 flow discharge can be estimated using using the clay to silt ratio, organic matter and soil permeability (If) with a R2 of 0.94 and 0.81, respectively. Runoff production and soil loss by a 1.5 lit.min-1 flow discharge can be estimated using soil organic matter and soil permeability (If) with a R2 of 0.90 and 0.94, respectively.
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