ARTIFICIAL SUBSTRATES, LIQUID FERTILIZATION AND APPLE CULTURE. RESULTS ON MODEL AND AMOUNT OF GROWTH.
The interation between nutritive supply and rootstock on the cultivar's growth and nutritional status was evaluated.
The results show that, in a system limiting root development, the vigour class of the rootstock emerges only with fertilizing treatments. Furthermore specific interactions rootstock/nutritive supply emerge and, in this connection, the more dwarfing rootstock seems to show a closer relationship with the fertilizing treatments.
As regard to nutritional status a positive correlation between nitrogen supply and foliar content was detected for M26 rootstock, while in M27 the relative proportions of inorganic nitrogen seem to have a more relevant effect respect to total nitrogen supply.