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Using Electromagnetic Induction To Trace Soil Nitrogen

Date:
October 11, 2004
Source:
USDA/Agricultural Research Service
Summary:
Nitrogen, a chemical nutrient needed by many growing crops, can accidentally end up in surface or subsurface water. Now an Agricultural Research Service scientist is using electromagnetic induction (EI) to measure changes in the soil's electrical conductivity, a quality that can provide important clues to the amount of nutrients present in the soil.

With a GPS unit strapped to his all-terrain vehicle, agricultural engineer Roger Eigenberg tows a sled with an electromagnetic geoconductivity meter attached to measure soil conductivity.
Credit: Photo by Stephen Ausmus.

Nitrogen, a chemical nutrient needed by many growing crops, can accidentally end up in surface or subsurface water. Now an Agricultural Research Service scientist is using electromagnetic induction (EI) to measure changes in the soil's electrical conductivity, a quality that can provide important clues to the amount of nutrients present in the soil.

Roger A. Eigenberg is an agricultural engineer at the ARS Roman L. Hruska U.S. Meat Animal Research Center in Clay Center, Neb. He has used EI to study several fields and create a map with light-shaded areas representing high electrical conductivity--or areas of high nitrate concentration--and dark areas that indicate low conductivity, or low nitrate concentration.

Eigenberg has compared fields with and without a winter cover crop and fields with added manure or compost. He discovered that EI could be used to monitor the effects of winter cover crops, because EI changes corresponded to soil nutrient changes as the cover crop took up nutrients in the fall and released them back to the soil in the spring.

Another Clay Center research location was a former manure compost site. In the past, scientists had to take numerous soil samples to determine where manure rows had been located. Using the commercially available EI equipment, Eigenberg was able to locate them in a fraction of the time. He tracked nutrient movement over a four-year period and found that using equipment such as the EI meter can determine nutrient buildup and movement to help prevent nitrate leaching into groundwater.

ARS is the U.S. Department of Agriculture's chief scientific research agency.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Using Electromagnetic Induction To Trace Soil Nitrogen." ScienceDaily. ScienceDaily, 11 October 2004. <www.sciencedaily.com/releases/2004/10/041011075626.htm>.
USDA/Agricultural Research Service. (2004, October 11). Using Electromagnetic Induction To Trace Soil Nitrogen. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2004/10/041011075626.htm
USDA/Agricultural Research Service. "Using Electromagnetic Induction To Trace Soil Nitrogen." ScienceDaily. www.sciencedaily.com/releases/2004/10/041011075626.htm (accessed July 31, 2014).

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