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Survey of Water-Extractable Phosphorus in Livestock Manures

^a USDA-ARS, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802
^b Agricultural Analytical Services Laboratory, The Pennsylvania State University, University Park, PA 16802
^c Dep. of Crop and Soil Sciences, The Pennsylvania State University, University Park, PA 16802

View larger version (20K): [in a new window]   Fig. 1. Relationship of proportion of water-extractable P with dry matter content of manure. *** indicates significance at p < 0.01.

View larger version (21K): [in a new window]   Fig. 2. Relationship of proportion of total P that is water-extractable (WEP TP–1) with total Ca content of manure. *** indicates significance at p < 0.001.

View larger version (19K): [in a new window]   Fig. 3. Box-and-whisker plots of water-extractable P (WEP) and the proportion of total P that is water extractable (WEP TP–1) in livestock manures. Median, upper, and lower quartiles are represented by horizontal box lines and Duncan mean categories by italic letters.

View larger version (19K): [in a new window]   Fig. 4. Box-and-whisker plot of dry matter and total P in livestock manures showing median, upper, and lower quartiles, Duncan mean categories (italic letters), and outliers (*).

View larger version (22K): [in a new window]   Fig. 5. Relationship of water-extractable P with other water-extractable elements (Ca, Mg., Fe) in dairy, layer chicken and swine manures. ** and *** indicate significance at p < 0.01 and 0.001 levels, respectively.

View larger version (18K): [in a new window]   Fig. 6. Box-and-whisker plot of water-extractable P of manure storage and handling system for all manures and dairy manures, showing quartiles (horizontal box lines), Duncan mean categories (italic letters) and outliers (*).

View larger version (22K): [in a new window]   Fig. 7. Box-and-whisker plot of water-extractable P of layer chicken manure storage and handling systems, showing quartiles (horizontal box lines) and Duncan mean categories (italic letters).