EN
			
			
			Boron (B) is an essential trace element required for optimal growth and development of the higher plants. Apple trees (Malus domestica Borkh.) have been known to have high B requirement. Either, insufficient and excessive contents of B in apple trees are associated with reduction of growth, fruit set, yielding and poor fruit quality. The apples with low B concentration are small, deformed and much more sensitive to splitting, russeting, and corking. Serious B deficiency causes the die-back of shoots and breaking of trunks and branches. On the other band, high boron concentration in apples enhances the incidence of many physiological disorders, particularly the internal breakdown. The sandy soils usually show a low concentration of total and available B. The uptake of B by plants is strongly reduced with the increase of soil pH and as a result of water deficiency in soil. There are also some evidences that the rootstock and cultivar of apple tree are the factors affecting B uptake and/or distribution in plant. Modes of B fertilization of apple trees are disccused in this paper.