Diet modification to reduce phosphorus surpluses: a mass balance approach.

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Diet modification to reduce phosphorus surpluses: a mass balance approach. Abstract Text:

R O Maguire,D A Crouse,S C Hodges,R O Maguire,D A Crouse,S C Hodges,

Diet modification to reduce phosphorus (P) concentrations in manures has been developed in response to environmental concerns over P losses from animal agriculture to surface waters. We used USDA-NASS statistics on animal numbers and crop production to calculate county scale mass balances for manure P production, P removed in harvested portion of crops, and the potential effects of diet modification. Although spreading manure evenly over all crop acreage within a county is unlikely to occur, these calculations give a good indication as to the impact diet modification to reduce P can have at a regional or national scale. There was a high degree of regional variability in manure P surpluses (e.g., with the large crop acreages in the grain belt leading to large P offtake in crops preventing most P surpluses). In 89% of counties, there was a deficit of manure P relative to crop P removal; therefore there was a manure P surplus in 11% of counties. Diet modification decreased the percentage of states with a manure P surplus from 11 to 8%, a decrease of approximately 27%. Diet modification decreased the percentage of counties with the greatest surpluses of manure P (>30 kg ha(-1)) from 3% of all counties to 1%. Diet modification to decrease manure P is an important part of strategies to alleviate environmental concerns associated with surplus manure P in many areas, but additional strategies to deal with manure P surpluses are needed in some areas.

Diet modification to reduce phosphorus surpluses: a mass balance approach. Publishing Authors By Initials

RO Maguire,DA Crouse,SC Hodges,RO Maguire,DA Crouse,SC Hodges,

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Diet modification to reduce phosphorus surpluses: a mass balance approach. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of environmental quality

VOLUME: 36

Page Numbers: 1235-40

Journal Abbreviation: J. Environ. Qual.

ISSN: 0047-2425

DAY: 17

MONTH: 07

YEAR: 2007

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LANGUAGE: eng

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AFFILIATION: Department of Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg, VA 24061, USA. rmaguire@vt.edu

Country: United States

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MEDLINETA: J Environ Qual

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