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Determination of phosphorus source coefficients for organic phosphorus sources: Laboratory studies

La Determinación de Coeficientes de Fuentes de Fósforo para Fuentes de Fósforo Orgánico: Estudios de Laboratorio

Leytem, A.B. and Sims, J.T. and Coale, F.J. (2004) Determination of phosphorus source coefficients for organic phosphorus sources: Laboratory studies. Journal of Environmental Quality. 33:380-388.

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Phosphorus losses in runoff from application of manures and biosolids
to agricultural land are implicated in the degradation of water
quality in the Chesapeake and Delaware Inland Bays. We conducted
an incubation study to determine the relative P solubility and bioavailability,
referred to as P source coefficients (PSCs), for organic P
sources, which are typically land-applied in the Mid-Atlantic USA.
Nine organic and one inorganic (ICH2PO4) P amendments were applied
to an Evesboro loamy sand (mesic, coated Typic Quartzipsamments)
at a rate of 60 mg P kri and incubated for 8 wk with subsamples
analyzed at 2 and 8 wk. There was an increase in Mehlich-3
P (M3-P), water-soluble P (WS-P), iron-oxide strip extractable P
(Fe0-P), and Mehlich-3 P saturation ratio (M3-PSR) with P additions,
which varied by P source. The trend of relative extractable WS-P,
Fe0-P, and M3-P generally followed the pattern: inorganic P > liquid
and deep pit manures > manures and biosolids treated with metal
salts or composted. We found significant differences in the availability
of P from varying organic P sources. The use of PSCs may be beneficial
when determining the risk of P losses from land application of manures
and other organic P sources and could be used in risk assessments
such as a P site index. These PSCs may also be useful for determining
P application rates when organic P sources are applied to P deficient
soils for use as a fertilizer source.

Item Type: Article
NWISRL Publication Number: 1120
Subjects: Research methodology
Mass Import - autoclassified (may be erroneous)
Depositing User: Users 5 not found.
Date Deposited: 20 Nov 2010 21:50
Last Modified: 07 Nov 2016 16:52
Item ID: 176