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DIVISION S-8-NUTRIENT MANAGEMENT & SOIL & PLANT ANALYSIS

Dynamics of Physical Organic Matter Fractions During De-inking Sludge Decomposition

^a Département de phytologie, Centre de Recherche en Horticulture, Université Laval, Ste-Foy, QC, Canada, G1K 7P4
^b Soils and Crops Research Centre. Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Ste-Foy, QC, Canada, G1V 2J3

angersd{at}em.agr.ca

Replenishment of soil C and N is essential for sustainable revegetation of minesoils. Our study investigated paper de-inking sludge as the organic amendment for revegetating an abandoned sandpit in Québec, Canada. Sludge was incorporated at 0 (check) and 105 Mg dry matter ha^-1 before seeding tall wheatgrass (Agropyron elongatum (Host) Beauv.). Nitrogen (at 315, 630 and 945 kg N ha^-1) and P (at 52.5 and 105 kg P ha^-1) were also applied to all plots. Distribution of C and N was determined periodically in two sizes (<53 µm and >53 µm) and two densities (<1.8 g cm^-3 and >1.8 g cm^-3) of soil fractions during 823 d. After 823 d, C concentrations were 43 and 69% of those of Day 5, for the low and high N rates, respectively. With time, the proportion of C in the heavy (>1.8 g cm^-3) fraction increased from 20 to 55%, but remained near 20% in the fine (<53 µm) fraction. Increasing N rates increased C conservation mainly in the coarse (>53 µm) fraction. The amount of N recovered in all fractions decreased after Day 86, in accordance with a previous litter bag study. Although inorganic N was positively correlated with total N in all fractions, the fine fraction was the best indicator of the size of the mineral N pool. Addition of sludge to the sandpit favored the restoration of C and N pools, and high levels of mineral N increased this effect. Residues became denser but remained relatively coarse during their decomposition.

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