The uptake and translocation of boron and enriched boron by mango.
Janse van Vuuren B. P. H., Robbertse P. J., Coetzer L. A., Hudson-Lamb D. C.
Author Affiliation: Margaretha Mes Instituut vir Saadnavorsing, Universiteit van Pretoria, Pretoria, South Africa.
Yearbook - South African Mango Growers' Association 12 : 14-19
Abstract : It has been shown that the B concentration in leaves of different ages varies in different seasons. The increased content after B sprays are applied to the foliage is not always in direct proportion to the amount administered. In greenhouse studies with 3-year-old cv. Haden trees, B was applied (1) to the soil as Solubor (500 ml of a solution containing 3 g/dm³), (2) to the leaves as 3 g Solubor in a litre of water + 0.1% Triton spreader, or (3) to the leaves, as isotope-labelled Solubor (95% 10B) at the same rate as in (2). Translocation and distribution of B were determined in leaves of different ages, and compared with untreated controls. The isotope was shown to be taken up by the leaves, but only via the abaxial surface. Boron was translocated from the mature leaves to the terminal inflorescences, but not from immature leaves. When B was applied to the soil it proved to be phytotoxic and low doses for soil drenching are advised. Young leaves and inflorescences were the major sink.