Evaluation of physicochemical properties, microbial loads and enzymes activity studies of agrochemicals on the Imo-River basin farm in Imo State Nigeria
Leo O. Egejuru, Emmanuel I. Akubugwo, Victor C. Ude, Ositadinma C. Ugbogu, and Amadike E. Ugbogu
Department of Biochemistry, Abia State University, PMB 2000, Uturu, Nigeria.
The impact of agrochemicals on soil physicochemical, soil microbial population
and hydrolytic enzyme activities were evaluated at three different soil depths in the
Imo River Basin farm (IRBF) and compared with soil from a farmland located
about 200 meters away from it, which served as the control. Soil physicochemical
parameters, hydrolytic enzyme activities and microbial bioload were determined
using standard methods. The results obtained showed significant reduction (P<0.05) in electrical conductivity, moisture content and cation exchange capacity.
Organic matter, pH, phosphate, sulphate, nitrates and potassium in the test samples
increased significantly (P<0.05) compared with the control. There was a significant
reduction in enzyme activities (P<0.05) of the dehydrogenase, polyphenol
oxidase, hydrogen peroxidase, acid phosphatase and alkaline phosphatase, in the
test samples compared to control .There was also a significant increase (P<0.05)
in urease activity in the test soil especially at the topsoil compared to control. Soil
microbial types and population were significantly reduced (P<0.05) in the test soil
compared to control. The result shows that agricultural activities affects soil
properties adversely and calls for control of some agricultural practices.
Keywoards: Enzymes; bioload; soil; agrochemicals; physico-chemical parameters; microorganism.