Small Plot Soil Hydrologic Components as Affected by Application of Vinasse Organic Residue

The present research was planned to assess the effect of application of two doses of 4. 5 and 8 l m-2 of environmentally friendly industrial organic waste of Vinasse on runoff commencement time، runoff coefficient and volume، soil loss and sediment concentration within small experimental plots of 20% slope under rainfall simulation with intensities of 50 and 90 mm h-1 and 15 min duration on a sandy clay loam soil. The results indicated significant effects of the treatment on runoff commencement time and sediment concentration (P<0. 04)، runoff coefficient، runoff volume as well as soil loss (P= 0. 00). Also the results revealed that the lower doses of vinasse application resulted in increasing runoff and soil loss for about 151 and 154% at 50 mmh-1 and increasing the expressed variables for respectively about 64 and 200 % at 90 mmh-1 in comparison with those recorded for control. The application of higher doses of vinasse increased runoff and soil loss rates for the respective 79 and 30% at 50 mmh-1، and increased runoff and soil loss rates for 60 and 58% at 90 mmh-1، respectively. In addition، the application of Vinasse increased runoff volume and soil loss in either one of the rainfall intensities. In this situation، 4. 5 l m-2 of vinasse in either of the rainfall intensities and 8 l m-2 of vinasse in intensity of rainfall 90 mm h-1 increased sediment concentration، but 8 l m-2 of vinasse in the intensity of 50 mm h-1 of rainfall reduced it، the effects of 8 l m-2 treatment to reduce runoff، soil loss and sediment concentration were found out as more than those obtained for 4. 5 l m-2 treatment. These results show that the application of vinasse amendment does not always prevent soil loss; neither does it improve soil physical properties. Higher rates of application of vinasse، together with extending the persistency period before rainfall، are therefore suggested.