Effects of field slope and duration of furrow irrigation on growth and yield of six grain-legumes on a waterlogging-prone vertisol

absorption de substances nutritives cajanus cajan crop yield fixation de l'azote furrow irrigation glycine max nitrogen fixation nutrient uptake phaseolus vulgaris rendement des cultures rendimiento de cultivos riego por surcos sloping land terre en pente terreno en declive vertisol vertisoles vertisols vigna angularis vigna radiata vigna unguiculata