Ecology, Environment and Conservation Paper

STUDIES ON THE PROFENOPHOS AND TRIAZOPHOS IN SANDY LOAM SOIL THEIR RECOVERY PERCENTAGE AND DISSIPATION IN/ON BRINJAL (SOLANUM MELONGENA L.) AND TOMATO (SOLANUM LYCOPERSICUM L.) FRUITS UNDER MIDDLE GUJARAT CONDITIONS

Gajendra Kumar Rana, P.G. Shah and Manoj Kumar

Abstract

A field experiment was conducted during Rabi 2012-13 at Main Vegetable Research Station, AAU, Anand (Gujarat), to study Persistence of profenophos and triazophos in sandy loam soil under laboratory conditions and their dissipation in/on brinjal and tomato fruits under supervised field trials. The experiment was carried out in Randomized Block Design (RBD) with three replications along with a control plot. The result revealed that in brinjal fruit initial deposits of profenophos and triazophos were 1.317 μg g-1 and 1.099 μg g- 1 respectively, which dissipated to 0.413 and 0.639 μg g-1 within the 24 hrs. By 10th day more than 90 % of residues dissipated for either insecticide. Dissipation of triazophos showed monophasic first order kinetics while that of profenophos showed biphasic first order kinetics. Half-life was calculated as 4.0 (phase II) and 2.9 days for profenophos and triazophos in brinjal fruits, respectively. In tomato fruit, initial deposits of profenophos and triazophos were 0.264 μg g-1 and 0.167 μg g-1 respectively, which were comparatively lower than the deposits reported in brinjal fruits. The levels reached Below Determination Limit (BDL) within the 5th and 10th days for profenophos and triazophos, respectively. Dissipation of both insecticides showed monophasic first order kinetic. Half-life was calculated as 7.1 and 5.3 days for profenophos and triazophos respectively, in tomato fruits.