FOLIAR ABSORPTION OF MN AND MG: EFFECTS OF PRODUCT FORMULATION, PERIOD OF APPLICATION AND MUTUAL INTERACTION ON APPLE

M. Thalheimer, N. Paoli
In order to assess the influence of the formulation of different Mg and Mn products on foliar absorption various field trials were carried out from 1997-2000. A further investigated aspect was the possible mutual interference of MgSO4 and MnSO4 on foliar absorption. Limited to some Mn products, also the influence of the application period (pre- and postbloom) was investigated. Furthermore, the incidence of necrotic leaf blotch and fruit russetting were assessed. The products tested were MgSO4 with and without the addition of urea, Mg(NO3)2, MgCl2, MnSO4 with and without the addition of urea, the fungicide Mancozeb, the commercial products Mantrac, Hydromag, Mg-Humate, Manganbetter, Mn-Chelal, Brexil Mn, Wuxal Mn and Meda F2. MgSO4 and MnSO4were also applied as combined treatments. Among the tested products, the mineral salts proved to be generally more efficient in increasing leaf nutrient content, both in the case of Mn and Mg. the addition of urea resulted in no additional benefit in terms of foliar absorption. as for the period of application, prebloom treatments with Mn had no significant effect on the nutrient level in leaf tissue grown later in the season. there was no negative side effect of any of the treatments in terms of fruit russetting except in the case of the chelates where a slight, but non significant increase of fruit russetting was recorded. no significant effect of any of the treatments on the incidence of necrotic leaf blotch was observed, suggesting that in these trials the primary causes for this physiological disorder were other factors than mg or Mn deficiencies.
Thalheimer, M. and Paoli, N. (2002). FOLIAR ABSORPTION OF MN AND MG: EFFECTS OF PRODUCT FORMULATION, PERIOD OF APPLICATION AND MUTUAL INTERACTION ON APPLE. Acta Hortic. 594, 157-164
DOI: 10.17660/ActaHortic.2002.594.15
https://doi.org/10.17660/ActaHortic.2002.594.15
Malus domestica Borkh., foliar nutrition, magnesium, mangenese, necrotic leaf blotch, fruit russetting
English

Acta Horticulturae