HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (14) Citing Articles via Google Scholar Google Scholar Articles by Leytem, A. B. Articles by Coale, F. J. Search for Related Content PubMed PubMed Citation Articles by Leytem, A. B. Articles by Coale, F. J. Agricola Articles by Leytem, A. B. Articles by Coale, F. J. Related Collections Animal Waste Best Management Practices Nutrient Management Phosphorus

Determination of Phosphorus Source Coefficients for Organic Phosphorus Sources

Laboratory Studies

^a USDA-ARS, North West Irrigation and Soils Research Lab, Kimberly, ID 83341-5076
^b Dep. of Plant and Soil Sciences, Univ. of Delaware, Newark, DE 19717-1303
^c Dep. of Natural Resource Sciences and Landscape Architecture, Univ. of Maryland, College Park, MD 20742-4452

View larger version (20K): [in a new window]   Fig. 1. Relationship between water-soluble P (WS-P) and total P in the 28 organic P sources. Dashed lines indicate WS-P values that are 10 or 30% of total P concentrations. DBS, dairy/beef solid; DBL, dairy/beef liquid; DBC, dairy/beef compost; SF, swine—fresh; SL, swine—liquid; PDP, poultry—deep pit; BLA, broiler litter with alum.

View larger version (22K): [in a new window]   Fig. 2. Relationship between soil test P (Mehlich 3) and water-soluble P (WS-P) or iron-oxides strip extractable P (FeO-P) following addition of 28 organic P sources at (a) 2 and (b) 8 wk.

View larger version (20K): [in a new window]   Fig. 3. Relationship between relative extractable soil (a) Mehlich 3-P, (b) iron-oxide strip extractable P (FeO-P), and (c) water-soluble P (WS-P) at 2 and 8 wk after treatment incorporation (for those samples that were significantly different between the two dates). The 1:1 line represents points in each relationship where no change in relative extractable P occurred between 2 and 8 wk.

View larger version (53K): [in a new window]   Fig. 4. Ranking, for each soil P test and sample date, of the relative P extractability (RPE) values for the 28 organic P sources. Bars in (a) to (f) are arranged in ascending order based on the RPE value for the soil P test and sample date. Dashed line in each graph represents the RPE value for the KH2PO4 source (100%). Error bars signify standard deviation of the means within source category. BL, broiler litter; BLA, broiler litter with alum; BP, Blue Plains; BR, Back River; LP, Little Patuxent; DBC, dairy/beef compost; DBL, dairy/beef liquid; DBS, dairy/beef solid; PDP, poultry—deep pit; SF, swine—fresh; SL, swine—liquid.

View larger version (43K): [in a new window]   Fig. 5. Overall relative P extractability (RPE) ranking, based on the average value of all RPE for each soil test and sample date, for the 11 types of organic P sources evaluated in the incubation study. BL, broiler litter; BLA, broiler litter with alum; BP, Blue Plains; BR, Back River; LP, Little Patuxent; DBC, dairy/beef compost; DBL, dairy/beef liquid; DBS, dairy/beef solid; PDP, poultry—deep pit; SF, swine—fresh; SL, swine—liquid.

View larger version (16K): [in a new window]   Fig. 6. Relationship between overall relative P extractability (RPE) ranking and iron-oxide strip extractable P (FeO-P) RPE ranking at 2 wk after treatment incorporation.