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The effect of the soil bio-disinfection, using CIKRON-H by-products, on the growth of potted Lactuca sativa var BSS and Solanum lycopersicum L. var. Campbell-28 in a cropping succession was evaluated. CIKRON-H by-product was incorporated to the soil in a dose of 3kg.m² of soil-1. A population of Meloidogyne incognita Kofoid y White (Chitwood) was inoculated to the soil, in a dose of five infestive juveniles-eggs.g-1 of soil, to corroborate the root-knot nematode suppressive effect of CIKRON-H by-product. A completely randomized design with six treatments and five replications each was used. The total population of saprophytic nematodes after and before bio-disinfection was also recorded. Soil bio-disinfection did not affect the plant growths. The reduction of M. incognita infective juveniles in soil and root gall index were observed. It corroborates the nematicidal effect of CIKRON-H by-product against this population. The saprophytic nematode populations increased after bio-disinfection. [ABSTRACT FROM AUTHOR]