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Tracking Poultry Litter Phosphorus: Threat Of Accumulation?

Date:
January 29, 2009
Source:
Soil Science Society of America
Summary:
A recent analysis of soils in the Delmarva Peninsula has shown that two forms of phosphorus are heavily present as a result of composted poultry litter, and two scientists have measured the accumulation of one of these forms from the manure to the crop soils.

The Delmarva Peninsula, flanking the eastern shore of the Chesapeake Bay, is home to some 600 million chickens. The resulting poultry manure and some of the chicken house bedding material is usually composted and then spread onto croplands as a fertilizer.

Phosphorus-31 nuclear magnetic resonance (31P NMR) and other methods of soil analysis have previously shown that two forms of phosphorus – orthophosphate and phytate (aka myoinositol hexakis phosphate) – dominate composted poultry litter. Although much is known about the transport of orthophosphate in soils, very little is known about the fate of phytate, a compound that is indigestible by poultry and abundant in poultry litter. With six phosphate groups per molecule phytate has the potential to be a significant player in non-point phosphorus pollution.

As part of her doctoral dissertation research at Yale University, scientist Jane Hill worked with scientist Barbara Cade-Menun at Stanford University to investigate the fate of phytate in crop soils on the Delmarva Peninsula. Specifically, Hill and Cade-Menun measured changes in phosphorus forms along a spatial transect on two active poultry farms. Using 31P NMR and supporting analytical methods, they found that phytate concentration was high in manures (about 50% of total P) but was not retained in crop soils and ditch sediments, where concentrations dropped to 2 to 15% of the total P. A corresponding increase in soil and sediment orthophosphate was also measured.

The study concluded that phytate does not accumulate in soils, but rather, is most likely to be hydrolyzed in situ by microorganisms.

Research in the respective groups of Drs. Hill and Cade-Menun is ongoing. Dr. Hill is focused on assessing the timing and controls on phytate hydrolysis in soils. Dr. Cade-Menun is currently a nutrient cycling scientist with Agriculture and Agri-Food Canada at the Semiarid Prairie Agricultural Research Station, focusing on the impacts of agricultural nutrients on the environment.


Story Source:

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


Journal Reference:

  1. Hill et al. Phosphorus-31 Nuclear Magnetic Resonance Spectroscopy Transect Study of Poultry Operations on the Delmarva Peninsula. Journal of Environmental Quality, 2009; 38 (1): 130 DOI: 10.2134/jeq2007.0587

Cite This Page:

Soil Science Society of America. "Tracking Poultry Litter Phosphorus: Threat Of Accumulation?." ScienceDaily. ScienceDaily, 29 January 2009. <www.sciencedaily.com/releases/2009/01/090128113240.htm>.
Soil Science Society of America. (2009, January 29). Tracking Poultry Litter Phosphorus: Threat Of Accumulation?. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2009/01/090128113240.htm
Soil Science Society of America. "Tracking Poultry Litter Phosphorus: Threat Of Accumulation?." ScienceDaily. www.sciencedaily.com/releases/2009/01/090128113240.htm (accessed April 18, 2014).

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