The effect of soil amendments with cotton (Gossypium hirsutum L.) seed oil cake, peanut (Arachis hypogaea L.) oil cake and chicken litter on Meloidogyne arenaria (Neal) Chitwood was studied in greenhouse experiments with squash (Cucurbita pepo L.). The amendments reduced root galling caused by the nematode and stimulated plant growth. The degree of nematode control was dependent on the amount of material added; oil cake amendments of 0.4% or more practically eliminated root galling. Nematode control with chicken litter was directly proportional to the amount of the litter added within the range of 0-5%; however, this material was not as nematicidal as the oil cakes since even the 5% rate failed to completely eliminate root galling. The use of oil cakes at rates of 0.4% or higher caused significant phytotoxicity. All treatments with chicken litter were nonphytotoxic. Soils treated with high levels (1.0% or more) of the amendments contained more nitrate nitrogen, and had higher urease
