COMPARISON WIND EROSION DRIFTING SOIL WITH PREDICTED AMOUNT BY WIND EROSION EQUATION EAST RAZAZA LAKE

Abstract

The aim of research was a comparison between actual amount of eroded soil by wind and predicated with WEQ equation which proposed by Woodruff and Siddoway amount (1965), at eastern Razzazah lack, for this reason we selected an transect 30 kilometers length, with 3 km width, three locations were selected for modeling at dimensions of 0, 15 and 30 km, namely, site1, site2 and site3 respectively. The sand traps were laid at different higher with three replicates at every sampling location, estimated amount of drift soil was comported with estimated amount by WEQ. Results showed soil capability for erosion were ranged between 157.5-185.0 Meq kg.ha-1, with a significant difference between studied sampling locations, site3 was exceed in erosion capability, but site 1 exceed in creep moved soil percent reached 2.09% comparison with site 3which showed lower amount reached 1.49%. According to Zachar classification (1982) these locations soils were considers very strident eroded, which needs to use essential practices to reduce eroded soil quantity. The presence of large discrepancy between the predicted values compared actual through measured the large standard deviation between both values 87.2 Meq kg.ha-1.year-1.