An initial study of fallow periods on the nematode community in the Soudanese-Sahelian zone of Senegal

abandoned land andropogon barbecho biologie du sol clay soils duration fallow helicotylenchus hosts nematodos de las plantas pennisetum pedicellatum plant nematodes plantas silvestres plante sauvage scutellonema senegal soil biology sol argileux sudano sahelian region suelo arcilloso tierras abandonadas tropical zones tylenchorhynchus wild plants xiphinema zona tropical zone tropicale