International Journal of Soil Science1816-4978xxxx-xxxxAcademic Journals Inc.10.3923/ijss.2009.67.79A. AbdallaMubarak LangerUwe 3200943Soil 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
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