Experimental Study of Runoff and Sediment Yield Affected by Ridge Direction and Width of Sloping Farmland

Water and soil losses from sloping farmlands potentially contribute to water eutrophication land degradation. However, few studies explored the combined effects of ridge direction width on surface runoff farmlands. Twenty-seven experimental plots (8 m long 4 wide) with nine treatments (three direction: cross ridge, longitudinal oblique ridge; three width: 40, 60, 80 cm) were adopted under natural rainfall conditions for two years in Luanhe River Basin China. Results indicated that had significant sediment yield ( p < 0.05). The no effect yield. No interaction was found between farmland based statistical analyses. Compared cross-ridge (CR) tillage oblique-ridge (OR) tillage, longitudinal-ridge (LR) significantly decreased by 78.9% 64.9% 88.2 83.5%, respectively directions related grade. When grade reached rainstorm, CR, LR, SR differences LR OR treatment 5.16 3.3 times, respectively, CR. level heavy rain or greater than 13.45 times Cross-ridge a 40 cm is an optimally effective measure conservation arid semiarid regions