EFFECTS OF PLANTING DENSITY, POSITION OF LEAVES IN THE TREE CROWN AND TYPE OF LEAF ON THE ACCUMULATION OF NUTRIENTS IN APPLE LEAVES
In both cultivars the N leaf content was significantly lower in leaves from the rows with more competition for light. Phosphorus was not greatly affected.
K content was higher in the leaves from rows with more competition for light.
Ca content was not affected by planting density, although in some cases it showed a tendency to be lower in leaves from the more dense planting.
Fe was affected by widespread branching.
Effects of planting density on Mg, Mn and Cu were indefinite. The K/Ca, N/Ca and K + Mg : Ca ratios appeared high because of the low Ca content.
In McIntosh, K, Mg and Fe contents as well as K/Ca and K + Mg : Ca ratios were significantly higher in the inner part of the tree crown, while in Maospur in the same position only K and Fe contents were higher.
As regards the type of leaf, both cultivars showed higher contents of N, P and K as well as higher N/Ca, K/Ca and K + Mg : Ca ratios in terminal leaves.
Conversely, Ca, Mg, Mn and Fe contents were higher in spur leaves.