Amendments of oil-cakes, bone and horn meals in soil increased tomato-plant growth and reduced the nematode multiplication. Highest improvement in plant growth and reduced reproduction factor and root galling were recorded in neem-cake amended soil. The least effect was with sesame-cake. The integration of oil-cakes (except mahua-cake), bone and horn meals with P. lilacinus, resulted in increased plant growth and reduced population build up of nematodes and root gallings. The groundnut-cake with P. lilacinus was most effective. The organic amendments increased the parasitism of P. lilacinus on root-knot nematodes.