EFFECT OF BULK DENSITY ON POTENTIAL SOIL LOSS IN NOTHERN SUDAN SAVANNAH ALFISOLS OF NIGERIA

A A HUSSAIN, A SANI, A R SANDA, A K LAMIDO, B S HAYATU

Abstract


The aim of the study was to evaluate the influence of BD on soil loss potential of Hadejia/ Jama’are river basin soils along river Kano in Sudan savannah zone, Nigeria. The study site was divided into five slopes/ blocks. In each block, disturbed soil samples were collected at the depth of 0-15 and 15-30cm and replicated ten times making 100 disturbed soil samples, and another soil samples were also collected at the depth of 0-10 and 10-20cm depths for erosion and BD assessments respectively. The geomorphic slopes were clearly demarcated by digital elevation model (DEM) map as a difference in elevation. BD and erosion were evaluated using soil cores and universal soil loss equation (USLE) accordingly. Findings indicate that BD of the soil at an error means square (EMS) of 0.0145 C.V, and SE of 0.0539 was found to have a highly significant variability among the slopes both at (P<0.05) and (P<0.01), but show no significant variability within the blocks and among the replications (P>0.05). Furthermore, the BD was negatively and significantly correlated with erosion (  = -0.93*),with upper, middle, crest, valley and lower slopes recording mean values of 1.61, 1.42, 1.59, 1.56 and 1.47g/cm3 respectively. Pertaining the potential soil loss determined at an EMS of 0.0001044 C.V. and SD of 0.00457, results indicated that there was no significant variability among slopes and within blocks between replications at both (P>0.05) and (P>0.01). the result indicated that middle slope has the highest potential soil loss with mean values of 0.01163 followed by lower, valley, upper and crest; 0.00819, 0.00533, 0.00243 and 0.00126 t/ha/yr respectively, indicating that soil erosion is a decreasing function of bulk density and that rate of soil loss will decrease at higher bulk densities. Hence, application of soil and water conservation practices should be encouraged to avert potential soil loss and restore the quality of the degraded soil of the study site.


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