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International Journal of Soil Science
  Year: 2009 | Volume: 4 | Issue: 3 | Page No.: 67-79
DOI: 10.3923/ijss.2009.67.79
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Soil Enzymes Activities in Irrigated and Rain-Fed Vertisols of the Semi-Arid Tropics of Sudan

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.
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How to cite this article:

Mubarak A. Abdalla and Uwe Langer, 2009. Soil Enzymes Activities in Irrigated and Rain-Fed Vertisols of the Semi-Arid Tropics of Sudan. International Journal of Soil Science, 4: 67-79.

DOI: 10.3923/ijss.2009.67.79






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