Estimation of phosphorus loss from agricultural land in the Southern region of the USA using the APEX, TBET, and APLE models


The purpose of our work was to determine, within the southern region (AL, AR, FL, GA, KY, LA, MS, NC, OK, SC, TN, and TX), the feasibility of using different models to determine potential phosphorus loss from agricultural fields in lieu of phosphorus indices.

What did we do? 

We have collected water quality and land use data from plot- and field-scale experiments throughout the South (AR, GA, MS, NC, OK, and TX).…

Phosphorus Indices: What is the water quality goal?

Phosphorus indices provide relative loss ratings that then have a corresponding management response.  Because most state Phosphorus Indices are qualitative it is not clear how the relative loss rating corresponds to actual phosphorus inputs into the receiving water and how the receiving water would react to these additions. …

Using Solar Power to Provide Animals with Water while Protecting Water Quality

Why Consider Solar Power for Watering Livestock?

The purpose of this paper and presentation is to show how we have been using solar powered watering stations to provide a clean water supply to livestock while also protecting water resources. The project was started as a way to assist farmers who had received funding from some federal or state agencies to improve water quality on and through their land.…

The Role of Computer Models in Environmental Phosphorus Management

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Why Model Agricultural Phosphorus?

Computer models are excellent ways to integrate years of scientific research into decision tools that producers and policy makers can use to reduce the environmental impact of agricultural phosphorus. Models are playing more important roles in efforts to manage phosphorus at the farm and watershed scales, so it is increasingly important to make sure models are well developed to meet the needs of users, give reliable predictions, and are consistently updated to keep pace with scientific knowledge.…

Water Quality Initiatives for Small Iowa Beef and Dairy Feedlot Operations (Small Feedlot Project)

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Traditionally, small feedlots and dairies have not been engaged in environmental regulations and awareness in Iowa due to the environmental focus being directed at large feedlots and confinement feeding operations.  Many small feedlot and dairy managers do not even recognize or admit that regulations do apply to their livestock operation.…