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Field studies on the enhancement of nematicidal activity of ammonia-releasing fertilisers by alkaline amendments

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For more content, see Nematologica.

Nematicidal activities of ammonia-releasing organic and inorganic fertilisers, applied with alkaline amendments, were tested against Meloidogyne javanica and M. incognita under field conditions. In microplots infested with M. javanica, ammonium sulphate applied with alkaline-stabilised biosolid (ASB) significantly reduced the root-galling index of tomato plants compared with that of plants grown in soils treated with ammonium sulphate or ASB alone. Although ammonia concentrations in the soil treated with broiler litter plus cement kiln dust were high (ca 60-200 mg kg−1), this treatment was less effective. Ammonia volatilisation resulted in rather low concentrations of ammonium in the soils treated with alkaline amendments. The combination of ASB and ammonium sulphate reduced the tomato root-galling index and the number of M. javanica juveniles recovered from the soil in a field experiment. On an organic farm, application of slaked lime in combination with broiler litter significantly reduced the root-galling index of pepper plants infested with M. incognita. Calcification of excess hydroxyls in the ASB or lime lowered the soil pH to values normally found in these soils in the field experiments.


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