Agrochemical Fate and Movement. Perspective and Scale of by Thomas R. Steinheimer, Lisa J. Ross, Terry D. Spittler

By Thomas R. Steinheimer, Lisa J. Ross, Terry D. Spittler

This e-book emphasizes the significance of scale-of-study whilst comparing the environmental destiny and shipping features of field-applied insecticides, together with pesticides, herbicides, and fungicides. the amount examines pesticide utilization and its strength effect on non-target average assets and the dominant matters surrounding pestidice flow in numerous geophysical destinations and environmental systems.

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Additional info for Agrochemical Fate and Movement. Perspective and Scale of Study

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We hypothesize that these scale effects are attributable to the pathways and timing of pollutant movement from fields into streams, coupled with dilution associated with routing of runoff water into and through the stream system from differing positions in the watershed. These scale effects need to be considered when comparing concentration and loading data from different watersheds and when designing sampling programs. 2 million km . Studies of runoff of water, suspended sediments, nutrients, and pesticides have occurred throughout the above range of watershed sizes.

67 3(1) * Includes estimated flow and loss for 2nd event after application, a major event when sampler failed. Flow and loss were estimated based on measured flow for this event in other watersheds and their known relationships to this watershed, and pesticide concentrations in similar events the same week in this watershed. Table II. Annual Herbicide Concentrations and Losses for Watershed A2 Herbicide 1994 Atrazine Cyanazine Nicosulturon 1995 Atrazine Cyanazine Nicosulturon 1996 Atrazine Cyanazine Nicosulturon Avg.

When runoff began with an event one day after application in 1994, loss of thifensulfuron was inexplicably higher for both compounds for watershed D than C, and higher for thifensulfuron methyl than tribenuron methyl. Chlorimuron ethyl was applied to watershed Β as a preemergence and postemergence treatment to soybeans and to watershed C as a postemergence treatment to soybeans. 9 g/yr. 8 g/yr. The surface water runoff concentrations reflected the higher use rates used in watershed B. 47 ppb. Pantone et al.

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