This investigation was carried out at the experimental orchard, Faculty of Agriculture, Assiut University, Egypt, to study the effect of slow release (feldspar), organic (vinasse) fertilizer and biofertilizer (yeast & potassiumage) on growth, nutritional status and fruiting of Balady mandarin trees during 2011, 2012 and 2013 seasons. Potassium sulphate and potassium …Web