The aim of this work is to evaluate the impact of oil cakes amendments (argan, neem, castor cake and ground castor) on control of Meloidogyne spp., affecting cucumber and melon; on soil fertility; on the growth and yield of cucumber under greenhouse in south-western Morocco. In cucumber growing- greenhouse, experimental results showed a reduction of gall formation, soil nematodes density, root rot infestation, and improvement of plant height and yield as compared to the control. Argan cake improved yield 112% more than the control. Generally, argan cake gave better results compared to the other treatments. In pots experiment on melon, maximum suppression (100%) of root knots and soil larvae population were found with argan; castor cake and ground argan shoot; while neem cake was less effective. Argan cake resulted in 24% increase in fresh weight compared to the infested control, while ground argan shoot enormously decreased both height and weight