H 3 BO 3 is the dominant form in soils thought to be absorbed by higher plants.
Lime induced B deficiency is possible.
Fruit and blossom content are more sensitive indices of tree B status than are soil or leaf B content. Younger leaves are affected first and are often small, stiff, thick, brittle leaves with smooth margins. Chlorosis and cupping are common. Leaves may form rosettes at nodes. At B concentrations 12 ppm or less, terminal buds die and shoot dieback takes place.