Research Article
Surface-Applied Biosolids Enhance Soil Organic Carbon and Nitrogen Stocks but Have Contrasting Effects on Soil Physical Quality
Table 2
Means (se) for selected soil properties in biosolids-amended soils (0–30 cm).
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Annual applications in this treatment reduced to biennial applications of 5 Mg ha−1 yr−1 in 2007. bParticle size distributions (sand, silt, and clay) were determined by hydrometer [18]; pH and electrical conductivity were determined by electrode in 1 : 1 water solution [19], EPA 9045D; 2M KCl-extractable and water-extractable were measured in 1 : 10 soil extracts using continuous flow colorimetry (EPA 353.2, EPA 365.5); and particulate organic matter (0.5–2.0 mm) was measured by weight loss on ignition [20]. |