Folia Horticulturae

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Effect of rootstock on growth and cropping of ‘Jonagold’ and ‘Holiday’ apple trees, at two planting densities and various budding height during six years after planting

Dariusz Wrona

Department of Pomology and Basic Natural Sciences in Horticulture
Warsaw Agricultural University
Nowoursynowska 166, 02-787 Warszawa, Poland

In the experiment carried out on fertile alluvial soil from autumn 1994, ‘Jonagold’ trees grown at low density (1666 trees per ha), showed after 6 years the lowest vigour on P 16. The cumulative (5-year) yield per tree was slightly lower on that stock. However, in cumulative cropping efficiency coefficient (CEC) no significant differences due to rootstock were found. At high density (7500 trees per ha) the lowest vigour of ‘Jonagold’ was noted on P 22, followed by P 16 and 57-146. Under these conditions, rootstock did not affect cumulative yield per tree, while CEC was definitely the highest for trees on P 22, followed by P 16 and 57-146. The vigour of ‘Holiday’ was, in general, much lower than that of ‘Jonagold’; P 22 and P 16 also retarded growth of this cultivar. The cumulative yields of ‘Holiday’ were lowest on low-vigour stocks (P 16, P 22, and 57-146). CEC did not depend on rootstock at low planting density, while at high density the highest cropping efficiency was noted on P 16 and P 22. No significant differences in fruit size due to rootstock were noted when routine chemical and hand thinning was applied. For high density, plantings trees on superdwarfing rootstocks, such as P 22 or P 16, should be preferred, for vigorous cultivars, such as ‘Jonagold’ in particular. For relatively lower densities, trees on dwarfing (M.9) or semi-dwarfing (62-396, M.26, P 60) may be applied.

Wrona D., 2001. Effect of rootstock on growth and cropping of ‘Jonagold’ and ‘Holiday’ apple trees, at two planting densities and various budding height during six years after planting. Folia Horticulturae 13/2: 31-39.