Abstract
We chose two surface soils with contrasting textures as model sediments for a model pond study. One soil, a calcareous clay, had a relatively high natural phosphate content and a large phosphate adsorption capacity. The second soil, a non calcareous loam, had a relatively low natural phosphate content and a small phosphate adsorption capacity. Chemical characteristics of both soils were roughly proportional to mineral surface area.
Pasture sites of each soil were tilled to a depth of 15 cm and two plots at each site were fertilized by hand with triple superphosphate. A third plot at each site was left unfertilized. After fertilization the plots were mechanically mixed and left fallow for 2 to 3 months. Then the plots were resampled and equilibration phosphate concentrations were determined again. Results showed significant phosphate fixation by the clay soil but no fixation by the loam soil.
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Research Soil Scientist, Botanist, Physical Science Technician and Physical Science Technician, respectively, USDA-ARS Agric. Water Quality Management Lab.
Contribution from the USDA-ARS agricultural Water Quality Management Lab., Durant, OK 74701.
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Olness, A., Troeger, W.W., Pardue, G.D. et al. Phosphorus in a model pond study: I sediment selection and preparation. Hydrobiologia 63, 11–15 (1979). https://doi.org/10.1007/BF00021012
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DOI: https://doi.org/10.1007/BF00021012