Articles | Volume 6, issue 2
Solid Earth, 6, 445–455, 2015
Solid Earth, 6, 445–455, 2015

Research article 29 Apr 2015

Research article | 29 Apr 2015

Reducing sediment concentration and soil loss using organic and inorganic amendments at plot scale

S. H. R. Sadeghi1, L. Gholami1,*, M. Homaee2, and A. Khaledi Darvishan1 S. H. R. Sadeghi et al.
  • 1Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor 46417-76489, Iran
  • 2Department of Soil Sciences, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
  • *now at: Department of Rangeland and Watershed Management, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

Abstract. Various organic and inorganic mulches are used for soil conservation purposes, the effectiveness of which on soil characteristics has not been comprehensively considered from different aspects. The present study surveys the efficiency of straw mulch, manure and TA-200 polyacrylamide with respective rates of 500, 300 and 50 g m−2 in changing sediment concentration and soil loss. The experiments were conducted for sandy-loam soil taken from a summer rangeland, the Alborz Mountains, northern Iran. The experiments were performed under laboratory conditions with simulated rainfall intensities of 30, 50, 70 and 90 mm h−1 and a slope of 30%. The results showed that the straw mulch decreased soil erosion at rate of 45.60% compared to the control plots and performed better than manure (8.98% reduction) and PAM (4.74% reduction). The results showed that the maximum reduction in sediment concentration and soil loss for all soil amendments occurred at the rainfall intensity of 90 mm h−1 with the rates of 58.69 and 63.24% for straw mulch, 14.65 and 13.14% for manure and 20.15 and 23.44% for TA-200.

Short summary
Reducing soil erosion is necessary for ecological balance in watershed scale. There are many biological and mechanical ways to control soil erosion. We compared the effects of two important amendments on soil loss in plot scale. The study amendments behaved differently under different rainfall intensities.