| Abstract: | Abstract Fluidized bed material (FBM, a coal/limestone combustion byproduct) was used as a Ca source and lime substitute in established apple (Malus domestica Borkh) and peach (Prunus persia L.) orchards. FBM or limestone had little effect on apple tree Ca status over three growing seasons. Peach leaf Ca concentrations were significantly greater from FBM applied at three times the soil lime requirement (on a weight basis) than limestone applied at the lime requiremnt or a non‐amended control. Peach peel and flesh Ca, however, were not significantly altered. Tissue trace element concentrations (Mn, Fe, Cu, Zn, B ,Al, Sr, Pb) were not affected by treatments. FBM applied at twice the lime requirement, on a weight basis, maintained soil pH at levels equivalent to agricultural limestone applied at the lime requirement during the three growing seasons in both studies. FBM was found to be a satisfactory substitute for agricultural limestone under orchard conditions and when applied at mutiples up to three times the soil lime requirement. |
