Organic vegetable growers regularly use supplementary fertilizers, including seaweed extracts and fish emulsions. The success of these products in crop production appears dependent on a number of factors, including the crop fertilized, the rate of application, the composition of the product, and the existing soil fertility. As these products continue to grow in popularity among organic growers, the growers need to know the situations in which these fertilizers can be most beneficial and cost-effective. Under the conditions in the studies reported here, sea-based foliar fertilizers were not found to have any measurable benefit to crop growth or yield.
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