Author(s): K I Al-Mughrabi
Article publication date: 2002-09-01
Vol. 20 No. 3 (yearly), pp. 156-160.
134
Keywords
methabenzthiazuron, lentil, hay, soil, residue analysis, chromatography
Abstract
Over two years, replicate plots of lentils (Lens culinaris L.) treated before seeding with methabenzthiazuron at a rate of 0.5 kg a.1. hal. In each year, representative soil, lentil and hay samples were randomly collected from plots of each treatment. Soil samples were tested for residues 24 hrs, after treatment and at harvest. Lentil and hay samples were tested at harvest. A cleanup step was conducted after extraction. Gas chromatograph equipped with a nitrogen/phosphorus detector was used to detect methabenzthiazuron. Overall average of residue levels in soil decreased significantly from 1.16 +- 0.15 mg kg-1, 24 hrs after treatment, to 0.12 +-0.01 mg kg-1 at harvest. No significant difference in the maximum average residue was found in lentil and hay samples collected from various plots and tested at harvest (0.10 + 0.01 and 0.19 +0.02 mg kg-1 in lentils and hay respectively). Recovery tests were conducted with each group of samples tested in order to determine the efficiency of the analytical procedure.