- Soils used in the present study :
Agricultural soil samples such as samples of black clay soil and red sandy loam soil, collected from groundnut cultivated fields of Ananatapuramu District of Andhra Pradesh, India in a semi arid zone from the depth of 12 cm and mixed thoroughly to prepare a homogenate composite sample. Soil samples air dried at room temperature, were cleaned by removing plant material and other debris and passed through a 2 mm sieve and stored at 4°C prior to analysis.
- Pesticides used in the present study :
Bifenthrin, Buprofezin, Dimethomorph and pyraclostrobin were selected in view of their abundant usage in Indian agriculture to combat various insect pests of groundnut.
- Soil incubation studies :
Suitable aliquots from stock solutions of the four selected pesticides were applied to five-gram portions of soil samples contained in test tubes (15x150mm) to provide final concentrations of 1.0, 2.5, 5.0, 7.5 and 10.0 kg ha-1 respectively. Soil samples receiving only distilled water served as controls. Samples were maintained at 60% water holding capacity throughout the experimental phase at 28±40C. Duplicates were withdrawn for analyzing soil enzymes.
Author(s) Details:
Ramanamma P,
Sri Krishna Devaraya University, Ananatapuramu, India.
Swetha K,
Sri Krishna Devaraya University, Ananatapuramu, India.
Rangaswamy V,
Sri Krishna Devaraya University, Ananatapuramu, India.