Daren Harmel

TL;DR: In this paper, the authors used the agricultural policy/environmental eXtender (APEX) and Soil and Water Assessment Tool (SWAT) models to evaluate pollutant sources and delivery and effects of agricultural conservation practices.

TL;DR: In this paper, measured annual nitrogen (N) and phosphorus (P) load data representing field scale transport from agricultural land uses were collected from 40 publications, resulting in a 163-record database with more than 1,100 watershed years of data.

TL;DR: With this update, MANAGE contains data from the vast majority of published peer-reviewed N and P export studies on homogeneous agricultural land uses in the USA under natural rainfall-runoff conditions and thus provides necessary data for modeling and decision-making related to agricultural runoff.

TL;DR: In this paper, a meta-analysis was conducted using 31 studies with 381 observations from a publicly available nutrient loss drainage database (Measured Annual Nutrient loads from Agricultural Environments, MANAGE) to address the current challenge of balancing crop yields and drainage N losses from intensive maize production systems.

TL;DR: In this paper, a stochastic sampling methodology loosely based on the Monte-Carlo technique was used to construct a database of 45 million Soil and Water Assessment Tool (SWAT) simulations.