Abstract
Abstract Fluidized bed material (FBM), a dry, high Ca, alkaline waste product which results from combining coal and limestone, was used as the sole source of Ca for ‘York Imperial’ apples (Malus domestica Borkh.) grown in outdoor sand cultures over 3 growing seasons. FBM treatments were compared to gypsum, applied at similar rates based on apple tree Ca requirements, and to a no Ca amended control. Over 3 years, leaf Ca was significantly enhanced by increasing levels of FBM. FBM was a better Ca source compared to gypsum applied at similar rates only during the third year. Fruit flesh Ca and the incidence of cork spot were not significantly or consistently affected by treatments. There were no visual or nutrient deficiencies or toxicities noted from the FBM nor were yields and average fruit size affected.
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