Paper Mill Biosolids and Forest-Derived Liming Materials Applied on Cropland: Residual Effects on Soil Properties and Metal Availability

Combined paper mill biosolids (PB) and forest-derived liming by-products improve soil properties, but their residual effects following several years of application have hardly been investigated. A 13-year (2009–2021) field study was initiated at Yamachiche, QC, Canada, to assess the PB materials on properties a loamy soil. The applied during nine consecutive (2000–2008) 0, 30, 60, 90 Mg wet·ha−1, whereas 30 PB·ha−1 rate also received one three (calcitic lime, lime mud, wood ash) 3 wet·ha−1. No amendment years. Past continued increase pH effect decreased over time; meanwhile, past applications caused low in NO3-N. Soil total C, which represented 40% added organic C when ceased, stabilized 15% after six Mehlich-3-extractable contents declined thirteen be not significant for P, K, Cu, while they reached half values Zn Cd. Conversely, Mehlich-3 Ca little affected by time. Therefore, land material benefited cessation.