The nonpoint source pollution problem can be controlled by implementing various best management practices (BMPs) in the watershed. However, before such practices are adopted, their effectiveness at various spatial and temporal scales must be evaluated. The objective of this research was to evaluate a suite of BMPs in a pasture-dominated watershed in their effectiveness at controlling nutrient l...

A nutrient loss reduction strategy is necessary to guide the efforts of improving water quality downstream an agricultural watershed. In this study, effectiveness two winter cover crops, namely cereal rye and annual ryegrass, explored as a in watershed that ultimately drains into supply reservoir. Using coupled optimization-watershed model, optimal placements crops were identified would result ...

Abstract Global chronic nitrogen (N) deposition to forests can alleviate ecosystem N limitation, with potentially wide ranging consequences for biodiversity, carbon sequestration, soil and surface water quality, greenhouse gas emissions. However, the ability predict these requires improved quantification of hard-to-measure fluxes, particularly loss retention. Here we combine a unique set long-t...

ABSTRACT The native field area in southern Brazil has been reduced due to cultivation, and part of the remainder is traditionally burned may increase water erosion soil degradation. In this research, chemical composition erosion, under natural rainfall, were evaluated an Inceptisol, south Santa Catarina state plateau. treatments consisted field, mowed once a year, cultivated no-tillage conditio...

Nutrient enrichment of water resources has degraded coastal waters throughout the world, including in the United States (e.g., Chesapeake Bay, Gulf of Mexico, and Neuse Estuary). Agricultural nonpoint sources have significant impacts on water resources. As a result, nutrient management planning is the primary tool recommended to reduce nutrient losses from agricultural fields. Its effectiveness...

The inability to incorporate manure into permanent pasture leads to the concentration of nutrients near the soil surface with the potential to be transported off site by runoff water. In this study, we used rainfall simulations to examine the effect of broiler chicken (Gallus gallus domesticus) litter application method and the runoff timing on nutrient and E. coli losses from tall fescue (Fest...