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Phosphate Release from Seasonally Flooded Soils

A Laboratory Microcosm Study

Eric O. Young and Donald S. Ross

Dep. of Plant and Soil Science, Hills Bldg., Univ. of Vermont, Burlington, VT 05405-0082




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Fig. 1. a. Changes in porewater–floodwater phosphate and porewater Fe2+ concentrations for lower-P soils. Note the different scale for Fe(II) in Soil 4.

b. Changes in porewater–floodwater phosphate and porewater Fe2+ concentrations for Soils 6 and 8 (lower-P soils with a higher P release to floodwater than those in Fig. 1a)

 


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Fig. 2. Changes in porewater–floodwater phosphate and porewater pH for the higher-P soils. The arrow indicates the day of the first qualitative appearance of Fe2+. Note the different scale for soluble P in Soil 14

 


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Fig. 3. Relationship between the porewater phosphate concentration and soil test parameters; (a) pH 4.8 NH4–acetate (modified Morgan's); (b) the degree of phosphorus saturation (DPS), calculated as the ratio of fluoride-extractable P (modified Morgan's with F-) to the phosphorus adsorption index (PAI)

 





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The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
and Life Sciences Education
Soil Science Society of America Journal
Copyright © 2001 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.