TY - JOUR 
AU - Shailendra Chauhan
AU - Anjana Srivastava 
AU - Prakash Srivastava
AU - Ankita Verma
TI - Sorption – desorption of imidacloprid insecticide on Indian soils of five different locations
JO - Eurasian Journal of Soil Science
VL - 2
IS - 2
PB - Federation of Eurasian Soil Science Societies 
SN - 2147-4249 
UR - http://ejss.fesss.org/10.18393/2013.2.107-113
DO - 10.18393/2013.2.107-113
SP , EP - 107 - 113
KW  - Sorption-desorption, imidacloprid, soil, loam, clay, Freundlich isotherm
PY  - 2013
AB  - Sorption-desorption processes govern the movement of all chemicals including pesticides in soils.  The present investigation was undertaken to study the sorption-desorption of imidacloprid, using a batch method, on soils of five different location of India. Sorption data were fitted to Freundlich isotherm. The log K value was the highest for loam type soil (1.830) and the lowest for clay type soil (1.661). The value of 1/n was the maximum for silt loam soil (0.909) but minimum for loam soil (0.723). Simple correlation analysis indicated that among soil properties only electrical conductivity showed a higher but marginally non-significant negative correlation with log K (r = -0.826) indicating that higher concentration of solutes solutes are conducive to low sorption capacity of soil. The desorption data conformed to two surfaces Freundlich desorption isotherm. The values of 1/n1' corresponding to easily desorbed fraction of imidacloprid showed significant negative correlation with soil pH (r = -0.886, significant at p ≤0.05) but significant positive correlation with clay content (r = 0.980, significant at p ≤0.01). The desorption index for easily desorbed fraction of imidacloprid (n1’/n) also had significant negative correlation with soil pH (r = 0.953, significant at p ≤0.05). From cumulative desorption data, it appeared that bioavailability of imidacloprid would be lower in neutral soil than acidic or alkaline soils.
ER  -