Teneurs en minéraux des fourrages de chaume et de leurs adventices : L'exemple d'une exploitation agricole du sud-est de la France (Vaucluse)

Abstract

Mineral contents of cereal stubble: the case of an agricultural exploitation in southeastern France (Vaucluse). In south-eastern France, where extensive farming systems still exists, including itinerant livestock keeping, cereal stubbles are used at the end of the grazing season. Nevertheless, little information on the mineral values of this forage is available. For the same grazing system of an agricultural exploitation of the Luberon regional natural park (south-eastern France, Vaucluse), mineral analyses of forage samples of four contrasting ecosystems (a fallow-land, a dry grassland, a wet meadow and a cereal stubble) show that the last ecosystem presents a dry biomass significantly lower than the three other plots sampled from July to October 1999. Nevertheless, the forage value of stubble seems to be of interest during the summer because the results show significant low concentrations of cellulose and insoluble ash. In contrast, the forage sampled in stubble has significantly higher concentrations of crude protein, Ca, Mg and K.