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Articles by Mubarak A. Abdalla
Total Records ( 2 ) for Mubarak A. Abdalla
  Mubarak A. Abdalla and Uwe Langer
  Soil management practices that involve intensive traditional ploughing and disking may affect soil quality. Soil enzymes activities were investigated from crop rotations in irrigated and rain-fed areas. Soil samples collected from long term (79 years), medium-term (46 years) and short-term (22 years) irrigated cotton (Gossypium hirsutum) schemes and rainfed cultivation of sorghum (Sorghum bicolor) and sesame (Sesamum indicum) in a semi-arid tropical Vertisol. Alkaline phosphatase was significantly higher in both short-term (661 μg p-nitrophenol g-1 soil h-1) and rain-fed cultivation (605-747 μg p-nitrophenol g-1 soil h-1). Long- and medium-term cultivation in the irrigated sector had significantly less protease activity [3.75-4.73 μg tyrosine g-1 soil (2 h-1)] compared to other cultivation systems [11.54-15.09 μg tyrosine g-1 soil (2 h-1)]. Except, long-term cultivation, there was a general separation in the activity of β-glucosidase between irrigated [average of 21.9 μg saligenin g-1 soil (3 h)-1] and rainfed Vertisols [17.9 μg saligenin g-1 soil (3 h)-1]. Correlation analysis and Principal Component Analysis (PCA) revealed that only alkaline phosphatase activity was positively correlated with total soil N and carbon contents. These results may draw attention on the impact of intensive application of agro-chemicals (pesticides, herbicides and fertilizers) on soil health in the world biggest Gezira cotton scheme.
  Mubarak A. Abdalla and Uwe Langer
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