Drought periods at different stages of growth of spring sown oil-seed rape (Brassica campestris, cv.Tove)

aceites brassica campestris contenido de agua en el suelo crop yield drought evapotranspiration floraison flowering huile irrigation maturation nitrogen content oils paille paja periodo vegetativo rendement des cultures rendimiento de cultivos riego seed semence semillas soil water content straw teneur en azote teneur en eau du sol vegetative period