Nutritional status of stone fruit trees on dwarfing and vigorous rootstocks under warm Mediterranean conditions
Fruit tree orchards are usually based on a combination of scion and rootstock. The new management trend toward orchard intensification requires rootstocks that reduce tree vigour to control tree size. For stone fruits, newly released dwarfing rootstocks (Rootpac® 20 and Krymsk® 1) were tested in a high density planting with the well-adapted but vigorous Garnem rootstock. Two experimental orchards of almond and peach were selected in a warm production area in northern Tunisia. A sweet almond cultivar Tuono grafted on Garnem and Rootpac® 20 were planted at 2 m within rows and 4 m between rows and also 1.5×4 m spacing, respectively. For peach, tree spacing was 2×6 m on both rootstocks. This investigation aimed to explore the nutritional status induced by vigorous and dwarfing rootstocks under warm conditions. The main macro element (N, P and K) analyses were monitored for the scion-rootstock combinations. Results showed that rootstock type influenced the nutritional status of fruit trees. Dwarfing rootstock Rootpac® 20 affected the leaf mineral contents of almond with visual chlorosis symptoms, whereas Krymsk® 1 performed similarly to the invigorating Garnem for peach. This study gives additional information on the adaptability of Prunus rootstocks via leaf mineral analysis as a nutritional status tool.
Ben Yahmed, J., Ghrab, M., Benmoussa, H. and Ben Mimoun, M. (2020). Nutritional status of stone fruit trees on dwarfing and vigorous rootstocks under warm Mediterranean conditions. Acta Hortic. 1281, 339-346
foliar mineral analysis, planting system, Prunus dulcis, Prunus persica