Average soil properties in the Belowground Plot Experiment.

Soil properties (and units) measured in the Belowground Plot Experiment included: pH, Bray Phosphorus (ppm), exchangeable Calcium (ppm), exchangeable Potassium (ppm), exchangeable Magnesium (ppm), exchangeable Sodium (ppm), NH4−Nitrogen (ppm), NO3−Nitrogen (ppm), extractable inorganic Nitrogen (ppm), Organic matter (%), total Nitrogen (% weight), and total Phosphorus (% weight). Treatment means and standard error is given for each parameter. P-values from general linear model testing effects listed are shown below.