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Designer Composts May Combat Phosphorus Overload

Date:
April 10, 2005
Source:
USDA / Agricultural Research Service
Summary:
There are designer handbags and designer shoes, so why not designer compost? Agricultural Research Service scientists are studying environmentally friendly composts that help keep phosphorus from seeping into water supplies.

Compost site operator Randy Townsend turns the windrows as necessary to replenish oxygen and mix the organic material for efficient composting.
Credit: Photo by Ken Hammond

There are designer handbags and designer shoes, so why not designer compost? Agricultural Research Service scientists are studying environmentally friendly composts that help keep phosphorus from seeping into water supplies.

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Applying manure and composts as nitrogen fertilizer often adds more phosphorus than plants need. This extra phosphorus can then leach or run off into water. But specially formulated composts can make the phosphorus less soluble in water, thus minimizing the chance that it will wash away.

ARS agronomists Rufus Chaney and Eton Codling have been searching for inexpensive ways to make phosphorus less water soluble, or to increase the ability of manure, biosolids and composts to hold onto the phosphorus.

Chaney and Codling, with the ARS Animal Manure and Byproducts Laboratory in Beltsville, Maryland, found that composts high in iron could markedly help the manure and compost retain phosphorus. Both iron and aluminum oxides increase adsorption of phosphorus. These can be added as chemical additives or by mixing byproducts rich in iron or aluminum with the manure or other feedstocks before composting.

Because phosphorus runoff can damage streams, lakes, rivers and other waterways, limits on soil phosphorus are being proposed. Many states have implemented manure management regulations aimed at preserving groundwater quality and the health of major water sources.

A management tool called the Phosphorus Index (PI) is used to assess the risk of phosphorus loss from agricultural fields to surface waters. In some states, the PI is based on plant-available phosphorus, but the scientists found that adding iron and aluminum oxides to manure or composts reduced the water solubility of phosphorus much more effectively than the PI test indicates.

The findings should help livestock producers limit phosphorus runoff a time when they face tougher restrictions on this valuable soil nutrient.

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. "Designer Composts May Combat Phosphorus Overload." ScienceDaily. ScienceDaily, 10 April 2005. <www.sciencedaily.com/releases/2005/03/050325184544.htm>.
USDA / Agricultural Research Service. (2005, April 10). Designer Composts May Combat Phosphorus Overload. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2005/03/050325184544.htm
USDA / Agricultural Research Service. "Designer Composts May Combat Phosphorus Overload." ScienceDaily. www.sciencedaily.com/releases/2005/03/050325184544.htm (accessed October 24, 2014).

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