Compositions for biological control of plant pathogenic nematodes

A soil amendment composition capable of stimulating the reproduction and development of normal soil microflora which produce ammonia and enzymes that are antagonistic to plant pathogenic nematodes of selected crop plants, which comprises:

• (a) at least one of (a) (1) soybean meal and (a)(2) chitin-protein complex obtained from crustacean shells or fungal mycelia, and
• (b) urea said component (b) being present in an amount effective to provide ammoniacal nitrogen sufficient for suppressing the growth of said pathogenic nematodes and said component (a) being present in an amount effective for suppressing the growth of said pathogenic nematodes in combination with component (b) while alleviating phytotoxic effects of component (b), whereby the amounts of (a) and (b) in said composition being adapted to provide about 1 to 3 grams of said composition per kilogram of soil in which said composition is admixed, wherein the ratio of (a)(1) meal to (b) is 2:1 to 8:1, or the ratio of (a)(2) complex to (b) is 5:1 to 1.5:1, or the ratio of (a)(1) meal:(b):(a)(2) complex is 3.0 to 5.0 parts (a)(1) meal:1:0 part:(b):1.5 to 3.5 parts (a)(2) complex.