Effects of Rootstock and Interstock on Seasonal Changes in Foliar Nutrient (N, P, K, Ca) Composition of ‘Delicious’ and ‘Golden Delicious’ Apple
DOI:
https://doi.org/10.71318/apom.1988.42.1.9Abstract
Two cultivars of apple ( Malus domesticaBorkh.) propagated on seven different rootstock or rootstock/interstock combinations were evaluated for foliar nutrient composition (N, K, P, and Ca). Two blocks of trees were used, one at a commercial orchard (Barber Orchards 3 ) and the other at the Mountain Horticulture Crops Research Station (MHCRS), both in Western NC. Samples were taken in May, June, July and August in 1984. At Barber Orchards the cultivar had a significant effect on nutrient composition with ‘Redchief’ trees higher in N, P and Ca than ‘Smoothee’ and lower in K. Rootstock had a significant effect on levels of K and Ca with trees on M.9/MM.106 highest in K and MM.106 highest in Ca. At MHCRS, N and Ca were significantly higher in ‘Redchief’ than ‘Smoothee.’ Rootstock had a significant effect on N, P, and K, with M.26 highest for N and P and M.9/MM.111 highest in K. Interactions of cultivar and rootstock were significant for all nutrients at MHCRS, but not Barber. Sampling date had a significant effect on foliar nutrients at both locations with N and K decreasing and Ca increasing over time.
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