|Authors: ||G.L. Reighard, W. Bridges, B. Rauh, N.A. Mayer|
|Keywords: || Prunus persica, nitrogen, interspecific hybrids, nectarine, plum, almond|
Prunus interspecific hybrids and plum species have replaced P. persica as the preferred rootstock for peach in Europe and some regions of North America.
However, compatibility and nutrient uptake have not been assessed with many peach cultivars. ‘Redhaven’ peach was grafted to a total of 24 rootstocks represented in 2 replicated trials near Clemson, South Carolina.
These trials were planted in 2006 and 2009 on a Cecil gravelly, sandy loam with a pH of 5.0 (no pre-plant lime) and 6.4 (pre-plant limed), respectively.
The rootstock cultivars included 9 interspecific Prunus hybrids and 3 non-peach Prunus species.
Leaf and fruit nutrient analyses were done on mature leaves (>100/tree) and ripe fruit (4/tree) collected in June 2011. Highly significant differences among rootstocks were found for scion leaf nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), zinc (Zn), manganese (Mn), sulfur (S) and sodium (Na). There were no significant differences due to rootstock for leaf copper (Cu) and iron (Fe).Only leaf Zn and Cu concentrations from trees on several rootstocks were below the minimum recommended.
Highly significant differences among rootstocks for fruit flesh nutrients were found for P, Mn and S. Lesser differences occurred for K and Mg.
Ca and Cu levels in the fruit of all rootstock combinations were below what has been reported in the literature for ‘Redhaven’. Annual soil K may have competed with root uptake of Ca and a spray program lacking foliar Cu applications may have indirectly affected Cu levels in the fruit.
Differences in mineral uptake between specific rootstock cultivars and rootstock species were observed in this study and may be indicators of efficiency for absorbing and transporting nutrients to peach scion cultivars.
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