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The present paper focused on investigating the potential of indigenous  Pseudomonas fluorescens  strain CD5 isolated from manure-enriched soil as a bioremediation agent for chlorpyrifos biodegradation in semi-arid soil of Bathinda district of Punjab, India. The soil had sandy loam texture with slightly alkaline pH and low organic matter content of 0.36%. The growth pattern, alkaline phosphatase enzyme production and chlorpyrifos utilization capability of  Pseudomonas fluorescens  strain CD5 were screened in mineral salt medium and the results revealed degradation of 78.19% of 500 mg L −1  chlorpyrifos within 15 days. The pattern of chlorpyrifos degradation was further studied in natural conditions of semi-arid soil by the  Pseudomonas fluorescens  strain CD5 and photolysis by sunlight for a period of 105 days. The biodegradation of chlorpyrifos at 500 mg kg −1  sterile soil by  Pseudomonas fluorescens  strain CD5 was 59.68% in comparison to 26% of photodegradation and enhancing total degradation. The residual chlorpyrifos in sterile soil after biodegradation by  Pseudomonas fluorescens  strain CD5 under natural light condition was 14.33%. The alkaline phosphatase enzyme activity in soil was found positively correlated with the chlorpyrifos degradation. The  Pseudomonas fluorescens  strain CD5 can be an effective candidate for the bioremediation of chlorpyrifos-contaminated soil.

Chlorpyrifos Degradation in Semi-Arid Soil by Pseudomonas fluorescens Strain CD5 Isolated from Manured Soil