Abstract
A study was conducted in the greenhouse to determine the effects of conventional and organic nitrogen (N) fertilizer on Fusarium wilt, caused by Fusarium solani, in northern highbush blueberry ( Vaccinium corymbosum L. ‘Legacy’). Root colonization by mycorrhizal fungi, soil microbial activity, and leaf antioxidants content was also measured the treatments. Plants grown with organic N fertilizer exhibited a lower incidence of Fusarium wilt than those grown with conventional N fertilizer (5% and 30% by the end of the experiment, respectively). Organic fertilizer also increased the soil biota activity, mycorrhizal colonization, and leaf antioxidant content relative to conventional N source. The results suggest that organic N fertilizer may improve the tolerance of blueberry to soil pathogens, such as F. solani.
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