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The application of organic amendments on soils poor in organic matter (OM) can improve long-term soil fertility, but may also enhance the mineralization of native soil organic matter. Three organic amendments, compost, sewage sludge and horse manure, used by urban market gardeners in Dakar, Senegal were analyzed for their OM maturity. Their fate was evaluated in a 45-d agronomic trial in a sandy Arenosol...
Water extractable organic matter (WEOM) in soil refers to a broad mixture of water-soluble structures recoverable in laboratory through predetermined procedures. In this work, we investigate the mechanisms controlling the occurrence of WEOM fractions isolated on XAD-8/4 resins in a calcareous soil profile as a function of soil depth and seasonal climatic changes. WEOM was roughly collected on a bi-weekly...
Water extractable organic matter (WEOM) is attributed a key role in soil major biogeochemical processes. Yet, information concerning its dynamics within the soil profile and under uncontrolled field conditions is scarce, particularly in agricultural soils. Here, we present a study of WEOM dynamics across a soil profile of 100cm over a period of seven months. Soil samples were collected from a field...
In this study, a multiwavelength UV spectral deconvolution (UVSD) procedure is proposed as a robust and simple procedure for direct estimation of carbon and nitrate contents in soil water extracts. Soil samples were collected from an open-air field cultivated with maize at 3 different depths, 30cm each, between 0 and 90cm of soil surface during a period of 7 months. Fractionation of water extractable...
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