Effect of poultry manure additions on the extractability of an added metal

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Abstract
Soils, to which poultry manure had been added at zero, 11.2 or 56.1 metric tons/ha, were sampled at 1, 10, 40 and 160 days after the addition. The effect of the remaining organic matter on metal extractability was studied using Cd as an indicator ion. Less of the added Cd could be extracted as exchangeable Cd or complexed Cd (CuOAc extractable) as the rate of manure addition increased. An HCl extract removed some of the retained Cd, but the total Cd extracted (exchangeable + complexed + HCl extractable) was lower at the highest rate of manure addition. The longer the manure decomposed, the more pronounced was the effect on Cd extractability. The amount of an organic matter addition and its stage of decomposition will affect the retention of a metal in a soil.

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