Influence of organic amendments on dissipation kinetics of two different pesticides in soil: a case study

ABSTRACT

A study was undertaken to investigate the remedial effect of some soil amendments (farmyard manure (FYM), press mud compost (PMC), cereal straw (CS) at 5 t ha⁻¹ and fresh cow dung slurry (FCD) @ 0.5 t ha⁻¹) on dissipation kinetics of imidacloprid and sulfosulfuron under laboratory conditions. Incorporation of CS or FCD was found to be most effective in degrading both the pesticides at faster rates. Dissipation of both the pesticides could be well accounted by two component (1 + 1) first order kinetics. The computed values of parameters revealed that use of organic amendments increased the dissipated fraction of imidacloprid and sulfosulfuron. Incorporation of CS or FCD in soil maintained relatively higher dissipation rate constants for both faster and slower dissipation processes of pesticides in comparison to control. Hence, eco-friendly practices of CS or FCD incorporation as soil amendment in soil can play a vital role in preventing soil and water pollution.

KEYWORDS:

• Dissipation
• half life
• imidacloprid
• organic amendments
• sulfosulfuron

Additional information

Funding

This work was supported by the Ministry of Environment, Forests and Climate change, New Delhi [19-22/2011 RE dated 27.3.2012];