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Reaction in Soil of Phosphorus Released from Poultry Litter
Author(s) -
Robinson J. Stephen,
Sharpley Andrew N.
Publication year - 1996
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1996.03615995006000050043x
Subject(s) - poultry litter , soil water , sorption , chemistry , leachate , manure , phosphorus , environmental chemistry , litter , zoology , fertilizer , nutrient , agronomy , adsorption , environmental science , soil science , biology , organic chemistry
Poultry production generates large amounts of litter or manure, which can be a valuable source of P for crops. However, litter application rates are usually based on data for mineral P fertilizer recommendations. In order to determine if this is agronomically and environmentally sound, the availability, fractions, and sorptivity of P from poultry litter or KH 2 PO 4 were determined in six Oklahoma soils following incubation for up to 28 d. An average 50% more P from KH 2 PO 4 ‐treated (78 mg kg −1 ) than from leachate‐treated soils (52 mg kg −1 ) was bioavailable, as determined by extraction with Fe‐oxide‐impregnated paper strips, after 28‐d incubations. Conversely, more NaHCO 3 ‐extractable P was found in leachate‐treated (66 mg kg −1 ) than KH 2 PO 4 ‐treated soils (42 mg kg −1 ). Calculated from Langmuir isotherms, P sorption maxima averaged 548 mg kg −1 for leachate‐treated and 304 mg kg −1 for KH 2 PO 4 ‐treated soils, while binding energies averaged 0.527 and 0.456 L mg −1 , respectively. The higher P sorption maxima and binding energies of leachate‐treated soils may result from the formation of Ca‐P complexes, given the increased Ca content of these soils. The different reaction in soil of P added as poultry litter leachate to that added as KH 2 PO 4 , indicates manure application rates should be based on soil tests that are sensitive to P source‐dependent sorption characteristics and/or manure trials, and not just on mineral fertilizer trials.