Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2008.3255.3260NikkamiD.ArdakaniA.J.MovahedF.B.122008818The aim of this study is to investigate the effects
of plowing treatments on the volume of surface runoff, soil loss and crop
yield, a research plan was implemented on hillslopes of the Sohrain Gharacharian
floodwater spreading station in Zanjan province, Iran. Rainfall, surface
runoff, sediment and crop yields were monitored in 1.8 wide x22.1 m long
erosion plots. Two plowing treatments of contour and up and down the slope
were compared on three slope classes of 0-12, 12-20 and 20-40% in triple
replication and randomized complete block design in a regional wheat cropping
experiment. Results demonstrated that contour plowing significantly reduced
the volume of surface runoff and sediment yield in all slope classes.
The amounts of reduction in all three slope classes were 83, 88 and 57%
for runoff and 92, 97 and 95% for sediment, respectively. The volume of
surface runoff and sediment yield from contour plowing of the 12-20 and
20-40% slopes were significantly lower compared to up and down the slope
plowing of 0-12%. Similar results were obtained when comparing volume
of surface runoff and sediment yield from contour plowing of 20-40% slope
to up and down the slope plowing of 12-20%. Contour plowing resulted in
soil loss that was 6.11, 7.73 and 7.73 times less than the soil loss threshold
in 0-12, 12-20 and 20-40% slopes, respectively. The quantity and quality
of crop yield did not change by plowing treatments. But, contour plowing
increased the crop yield by 19, 21 and 9% on 0-12, 12-20 and 20-40% slopes,
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