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EFFECT OF ORGANIC AMENDMENTS ON SOIL AGGREGATE STABILITY

EFFECT OF ORGANIC AMENDMENTS ON SOIL AGGREGATE STABILITY,M. Annabi,S. Houot,M. Poitrenaud,J. N. Rampon,H. Gaillard,Y. Le Bissonnais

EFFECT OF ORGANIC AMENDMENTS ON SOIL AGGREGATE STABILITY  
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Intensive agriculture is known to cause a decline in soil organic matter content and alter soil structure. The objective of this study was to compare the effect of two urban composts (a municipal solid waste com- post, MSW and a biowaste compost, BW) and a farmyard manure (FYM) on aggregate stability in a loamy soil under field condition. Laboratory incubations of calibrated aggregates added of the same organic amendments were realized in controlled conditions (28 and 4 °C) to confirm the effects observed in field conditions. After one application of the MSW and BW composts in the field experiment, aggregate stabi- lity increased compared to the control plot. In lab conditions, MSW and FYM enhanced the aggregate sta- bility, more at 4°C than at 28°C. In both experiments, the aggregate stability were related to the stimula- tion of microbial activity after addition of still highly biodegradable organic amendments, more persistent at 4°C than at 28°C.
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