Calcium(Ca) and Boron(B) are closely related to fruit development, and they are been thought to be key mineral elements which could affect fruit quality both directly and indirectly. Change rules of Ca and B concentrations in fruit were related to mechanisms of Ca and B uptake by fruit, which were the bases of nutrients applications. In the present work, the rules of Ca nutrient uptake by fruit of different type citrus cultivars and dynamics of B concentrations in Newhall (Citrus sinensis Osbeck) navel oran...