Summary
Biosolids are municipal wastewater products (sewage sludge) that have undergone additional treatment to meet EPA requirements to be land applied to crop land as a nutrient and organic matter (OM) source. In semi-arid dryland systems, biosolids may be beneficial for improving soil physical, chemical, and biological attributes. The objective of this study was to determine how agronomically relevant biosolids application rates at two long-term (20+ year) field trials affected soil health properties in semi-arid dryland systems. Soil samples were collected (0-15 cm) from (1) a 26-year trial in central Washington (WA) in a grain-fallow rotation, with three biosolids application rates applied every four years compared to synthetic fertilizer and unfertilized controls, and (2) a 23-year trial in
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