Volume 52 Number 2 Article 17
Year 1998 Month 4
Title: Growth, Yield, Survival and Leaf Nutrient Concentrations of Plums on Various Rootstocks
Authors: G.E. Boyhan, J.D. Norton, J.A. Pitts and D.G. Himelrich
Abstract:
Effects of seedling rootstocks Lovell, Halford, Nemaguard, and Nemared and asexually propagated rootstocks St.
Julien A and Pixy on tree growth, yield, survival and leaf nutrient concentration of 2 plum cultivars
was studied.
Yields did not differ among rootstocks for 'AU-Producer' or 'AU-Amber'. Cumulative yield efficiency (CYE) did not differ among rootstocks grafted with 'AU-Amber,' but was significantly lower for Pixy
rootstock grafted with 'AU-Producer' compared to Lovell, Halford, Nemaguard, Nemared and St.
Julien rootstocks.
St.
Julien and Pixy dwarfed scions, resulting in smaller canopy widths and trunk cross-sectional areas
(TCA). Their effect on bloom dates was inconsistent, delaying bloom in some years but not in others.
The only
rootstock-by-year interactions for foliar nutrient levels were for Mn, Fe, and B with 'AU-Producer'. Nutrient
levels and multiple regression results indicated that Mg was a positive predictor for canopy width and TCA
while Zn and Mn were negatively related to TCA. Attempts to predict tree survival rates in 1994 and 1995 with
1993 and 1994 leaf nutrient levels, respectively, indicated that survival in 1994 was positively predicted with
K and negatively with Mn with an R2 of 0.143. There was no predicted model for 1995 survival based on 1994
nutrient data.
Survival in 1995 was negatively predicted with 1995 Zn levels with an R2 of 0.277.
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