Leaching of agrichemicals from suburban areas
1993
Gold, A.J. | Groffman, P.M.
Groundwater leaching losses from home lawns of the herbicides 2,4-D and dicamba and the nutrient nitrate (NO3(-)) were found to be quite low in a multiple year study using application rates recommended for residential lawn care. Annual geometric mean concentrations of both 2,4-D and dicamba were less than 1 microgram L-1. The annual flow-weighted mean concentration of NO3(-)-N never exceeded 5 mg L-1 and was typically less than 2 mg L-1 during 5 years of monitoring. When compared to silage corn plots monitored at the same location over the identical time period, home lawns generated approximately 15% of the NO3(-) lost to groundwater when comparable fertilization and irrigation practices were used. Levels of microbial biomass were found to be significantly higher in home lawns than in silage corn plots and were associated with higher rates of herbicide dissipation and potentially with higher rates of N immobilization. Higher rates of these microbial processes and the perennial nature of lawns may contribute, to lower leaching losses of N and other agrichemicals from suburban lawns than those reported from many agricultural crops.
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