Volume No. 6 Issue No.: 2 Page No.: 255-260 Oct-Dec 2011

 

Persistence and Dissipation behaviour of Chlorpyriphos in Soil under okra crop

 

Samriti, Reena Chauhan1 and Beena Kumari*2

1. Department of Chemistry and Physics, Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana (INDIA)
2. Department of Entomology, Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana (INDIA)

 

Received on : April 22, 2011

 

ABSTRACT

 

To understand the fate of chlorpyriphos in sandy loam soil, a field experiment was conducted at Research Farm of Department of Entomology CCSHAU, Hisar, India, during Kharif, 2009 on okra crop (variety, varsha uphar). Chlorpyriphos (Radar 20 EC) was applied on okra crop at 200 g a.i. /ha (single dose, T1) and 400 g a.i. /ha (double dose, T2) Sample of okra soils were collected on 0, 1, 3, 5, 7, 10, 15 days after treatment and at harvest along with control soil sample. After air drying residues in soils were estimated by gas chromatograph equipped with capillary column and Electron Capture Detector (ECD). The initial deposits of chlorpyriphos in soil were found to be 0.055 mg/kg at single dose and 0.113 mg/kg at double dose. The residues persisted up to 10 days at both the doses. On 15th day, residues reached below detectable level of 0.005 mg/kg in case of both the doses. The dissipation followed a first order kinetics with half life period of 3.16 and 3.03 days at, respective doses.

 

Keywords : Chlorpyriphos, Soil, Persistence, Gas Liquid Chromatograph, Okra

 

 

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