Abstract
Abstract A possible mechanism of suppression of the growth of Fusarium oxysporum f. sp. raphani by nitrate was studied. High concentration of nitrate in soil suppressed the population of F. oxysporum f. sp. raphani, and the effect of nitrate was more pronounced in the soil with a higher Ca content. In the medium, nitrate (as KNO3) inhibited the conidial formation of the fungus, while the mycelial growth of the fungus was not inhibited at a concentration of nitrate up to 200 mg NO3-N/L. The survival of the conidia decreased with increasing nitrate level in the soils of both the rhizosphere and non-rhizosphere. The chlamydospore formation was stimulated by the nitrate amendment. The presence of large numbers of Fusarium-antagonists, actinomycetes and bacteria, in the nitrate-amended soil was also considered to contribute to the reduction of the population of F. oxysporum f. sp. raphani.
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