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United States Department of Agriculture

Agricultural Research Service

Cleaning the Chesapeake Bay from Space / August 30, 2010 / News from the USDA Agricultural Research Service
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Photo: Two scientists taking soil samples in a field.
ARS soil scientist Greg McCarty (right) and U.S. Geological Survey researcher Dean Hively are developing new ways to judge the effectiveness of cover crops in controlling losses of nitrogen and phosphorus from farms into the Chesapeake Bay. Click the image for more information about it.

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Cleaning the Chesapeake Bay from Space

By Don Comis
August 30, 2010

A pilot test of an innovative use of new remote sensing technologies to aid the Chesapeake Bay cleanup begins this year in Talbot County, Md., on the Bay's Eastern Shore.

Greg McCarty, a U.S. Department of Agriculture (USDA) soil scientist, and Dean Hively, now a visiting U.S. Geological Survey physical scientist, merged remote sensing, field sampling, and farm program records to judge the effectiveness of winter cover crops in controlling farm nitrogen and phosphorus losses to the Bay.

McCarty and Hively lead an interagency research team that works closely with the Maryland Department of Agriculture. McCarty is at the Agricultural Research Service (ARS) Hydrology and Remote Sensing Laboratory (HRSL) in Beltsville, Md. ARS is USDA's principal intramural scientific research agency.

Cover crops—mostly rye, barley, and wheat—are a principal tool in Maryland for controlling nitrogen and phosphorus flows to the bay. The crops catch excess nitrogen and phosphorus left over from fertilizers and manures used to grow corn, soybean or other summer crops.

In a 4-year study using this combination of tools, McCarty and Hively showed that, of the three major cover crops, wheat is by far the least efficient at taking up nitrogen, due to its slow fall growth. Yet 60 percent of the land planted to cover crops is in winter wheat. Maryland pays farmers part of the costs of planting cover crops, with a premium for early-planted and non-wheat crops.

The pilot project will allow the Talbot County soil conservation district office to evaluate underperforming fields to plan for improved implementation in the coming year.

The scientists are developing software to summarize the data, by county and by watershed, to produce reports for Chesapeake Bay Watershed partners, including county, state, federal and other agencies.

This is all part of a feedback system that will lead to annual adjustments in federal and state conservation program implementation strategies.

With success, the project will be scaled up to each of Maryland's 24 soil conservation districts statewide.

Read more about this research in the August 2010 issue of Agricultural Research magazine.

Last Modified: 8/30/2010
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