Abstract
We grew three successive crops of oats (Avena sativa L.) on Abitibi soils, either from individual horizons or from horizon mixtures. Soils were used as such or amended with 10 t of C/ha, added as peat or manure. Yield significantly decreased from the first to the third crop. In the third crop, yields of the manure-treated samples were significantly higher, at the 5% level, than those of the untreated samples. Adding an organic amendment caused a decrease of up to 9% of dry bulk density values. We also discuss the effects of cultivation on some chemical properties.
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