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Papermill Biosolids Effect on Soil Physical and Chemical Properties

Dep. of Land Resource Science, Univ. of Guelph, Guelph, Ontario, Canada N1G 2W1

View larger version (19K): [in this window] [in a new window]   Fig. 1. Bulk density (1999 to 2001) in response to increasing rates of papermill biosolids (PB) at Elora and Cambridge on plots planted to soybeans. When no significant differences were observed between the sampling periods (P > 0.05), a common line was fitted. NS, dotted line, indicates that the slope was not significant (P > 0.05).

View larger version (12K): [in this window] [in a new window]   Fig. 2. Regressions of soil bulk density measured at Campden (2001) and Vineland (1999) in response to increasing rates of papermill biosolids (PB) on plots planted to soybeans. Linear relationships were considered to be significant at P < 0.05.

View larger version (13K): [in this window] [in a new window]   Fig. 3. Infiltration rates, Kfs, (m s–1) on four agricultural soils planted to corn and receiving a nonamended and 150 Mg PB ha–1 treatment during the study period (1999 to 2001). Bars indicate least squares standard error and treatments with different letters within each year were significantly different at P < 0.05. Please note differences in scale.

View larger version (11K): [in this window] [in a new window]   Fig. 4. Regressions of water-stable aggregates (1–2 mm) in response to papermill biosolids (PB) rates after 1 yr (1999) on plots planted to corn at Elora, Cambridge, and Vineland. NS, dotted lines, indicates that the slopes of the regressions were not significant (P > 0.05).

View larger version (15K): [in this window] [in a new window]   Fig. 5. Water-stable aggregates (1–2 mm and 2–4 mm), after 3 yr of PB applications, from the nonamended and 150 Mg ha–1 PB treatments on plots planted to corn at Elora, Cambridge, and Campden. Bars indicate least squares standard error and treatments with different letters within each year were significantly different at P < 0.05.

View larger version (10K): [in this window] [in a new window]   Fig. 6. Total soil carbon (0 to 30 cm) after 1 yr (1999) with increasing PB rates on plots planted to soybeans at Elora, Cambridge, and Vineland. NS, dotted line, indicates that the regression was not significant (P > 0.05).