Calcium needs to be available to apple trees early in the season during the cell-division phase, because that’s when the tree is drawing nutrients from its reserves and from the soil, and it’s possible to get nutrients into the fruit. After fruit cell division stops, nutrient applications will only help keep the tree and canopy supplied so they don’t rob the fruit of calcium, Kraig Klicker of SoilTech Northwest, Inc., told growers at the annual Lake Chelan Horticultural Day last winter. Growers can improve fruit calcium levels with soil-applied or foliar nutrients applied in the fall or early spring. Klicker […]