Sulphur mineralization of cattle manure (CM) and green waste compost (GWC) added to six agricultural soils with different chemical properties was monitored over 10 weeks in a laboratory incubation experiment. Although the amount of sulphur was higher in CM than in GWC, the cumulative SO42--S values in GWC-treated soils were higher than in soil amended with CM. The percentages of mineralized S were always higher in GWC-treated soil (in the range 1.3-8.5%) than in CM-treated soil (in the range 0.9-3.8%). In three of the six soils, particularly for CM, an immobilization of sulphur was observed. Three kinetic models were evaluated for their suitability to describe the mineralization process. The first-order model best described S mineralization for both amended and control soils. The GWC substantially increased the amount of potentially mineralizable S (S-0) relative to the controls. In GWC-treated soils, the rates of S mineralization (k) were higher than rates in the controls. The k of CM-amended soils was often lower than the k of control soils. Parameters derived from the model were tested as indices for assessing the relationships between S mineralization and soil characteristics. The So was positively correlated to the amount of cumulative SO42--S and also to the content of organic C, N and S in soil.
|Autori:||Saviozzi A.; Cardelli R.; Cipolli S.; Levi-Minzi R.; Riffaldi R.|
|Titolo:||Sulphur mineralization kinetics of cattle manure and green waste compost in soils|
|Anno del prodotto:||2006|
|Digital Object Identifier (DOI):||10.1177/0734242X06068517|
|Appare nelle tipologie:||1.1 Articolo in rivista|