Featured Research

from universities, journals, and other organizations

Southern soils mitigate manure microbes

Date:
September 10, 2010
Source:
American Society of Agronomy
Summary:
Scientists release the first report of bacterial pathogens in soils treated with swine manure.

That swine manure sprayed on to fields adds valuable nutrients to the soil is well known. But what is not known is whether all that manure is bringing harmful bacteria with it.

A new study looks at the levels of nutrients and bacteria in soils of fields that have been sprayed with manure for fifteen years or more. The research team, composed of scientists from the USDA-ARS Crop Science Research Laboratory at Mississippi State, tested soils inside and outside fields of five farms on twenty different soils types. Their results are reported in the September-October 2010 Journal of Environmental Quality, published by the American Society of Agronomy, the Crop Science Society of America, and the Soil Science Society of America.

Manure sprayed fields were found to contain higher concentrations of several types of bacteria. These include measurements of total bacteria, fecal bacteria, Staphylococcus (a common bacteria living inside animals and a potential human pathogen) and Clostridium (common gut inhabitants and potential pathogens).

Two other types of bacteria that are potential pathogens, E.Coli and Enterococcus, showed no differences in between sprayed or non-sprayed fields. One type of bacteria, Listeria, was found in higher concentrations outside, rather than inside, the fields. Two gastrointestinal pathogens, Campylobacter and Salmonella, could not be cultured in any significant amount from the fields, although DNA testing did detect some bacteria, though there were no differences between sprayed and non-sprayed fields.

The investigators also analyzed public health data from three public health districts with similar land areas, populations, and agricultural bases, but with varying numbers of swine confined animal feeding operations (CAFOs), a typical source of swine manure. Their analysis of annual reports of illnesses caused by Campylobacter and Salmonella from 1993 through 2008 showed no relationship between reported cases of these human illnesses and swine CAFO numbers.

The research team also tested soils for nutrient levels. These tests showed higher pH and higher levels of phosphorus, potassium, magnesium, sodium, copper, and zinc inside spray fields compared to outside. These results were consistent with what was expected for spray fields after long-term use. Finding differences between the same soil types inside and outside confirmed that outside soils had not been contaminated with manure and would provide good comparisons of bacteria.

"Finding low levels of pathogens outside spray fields is not surprising, because these bacteria are known to infect a wide range of wild and domestic birds and animals," said team leader Mike McLaughlin.

Team microbiologist, John Brooks, added, "Finding similar low levels inside and outside the spray fields suggests that the low levels of pathogens in [manure] are further diluted in spray fields and either do not survive in soil or survive at low levels below cultural detection limits."

This first report on spray field bacteria in the region suggests that manure nutrient management plans have been effective for nutrients and for bacterial pathogens. Future research will focus on enhanced resolution of pathogen levels in manure and soils, on pathogen survival and transport in soil and on plants, and on practical solutions to further reduce or eliminate risks from these pathogens.


Story Source:

The above story is based on materials provided by American Society of Agronomy. Note: Materials may be edited for content and length.


Journal Reference:

  1. Michael R. McLaughlin, John P. Brooks, Ardeshir Adeli, John J. Read. Comparison of Selected Nutrients and Bacteria from Common Contiguous Soils Inside and Outside Swine Lagoon Effluent Spray Fields after Long-Term Use. Journal of Environment Quality, 2010; 39 (5): 1829 DOI: 10.2134/jeq2009.0447

Cite This Page:

American Society of Agronomy. "Southern soils mitigate manure microbes." ScienceDaily. ScienceDaily, 10 September 2010. <www.sciencedaily.com/releases/2010/09/100910093154.htm>.
American Society of Agronomy. (2010, September 10). Southern soils mitigate manure microbes. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2010/09/100910093154.htm
American Society of Agronomy. "Southern soils mitigate manure microbes." ScienceDaily. www.sciencedaily.com/releases/2010/09/100910093154.htm (accessed July 31, 2014).

Share This




More Plants & Animals News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Thousands Flocking to German Crop Circle

Raw: Thousands Flocking to German Crop Circle

AP (July 30, 2014) Thousands of people are trekking to a Bavarian farmer's field to check out a mysterious set of crop circles. (July 30) Video provided by AP
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Xtreme Eating: Your Daily Caloric Intake All On One Plate

Xtreme Eating: Your Daily Caloric Intake All On One Plate

Newsy (July 30, 2014) The Center for Science in the Public Interest released its 2014 list of single meals with whopping calorie counts. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



      Save/Print:
      Share:

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile: iPhone Android Web
      Follow: Facebook Twitter Google+
      Subscribe: RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins