Growth, Productivity, Spur Quality, Light Transmission and Net Photosynthesis of ‘Golden Delicious’ Apple Trees on Four Rootstocks in Three Training Systems 1
DOI:
https://doi.org/10.71318/apom.1994.48.4.251Abstract
A study was conducted in 1990 to 1992 to compare growth and efficiency of ‘Golden Delicious’ apple [ Malus domesticaBorkh.] trees on four rootstocks (MM.111EMLA, M.7a, M.26EMLA, M.9EMLA) in three training systems (3-wire palmette trellis, freestanding central leader, nonpruned). No pruning compared to central leader pruning reduced height of trees on M.9EMLA, M.26EMLA, and M.7a but not of trees on MM.111EMLA. Trees on M.9EMLA were the smallest and most yield efficient trees; those on M.7a were the least yield efficient. Height and width were reduced in the 3-wire trellis system, yet yield efficiency was equal to that of the central leader system. Spur quality was higher in the 3-wire trellis and the central leader systems than in the nonpruned system, but tnere were no consistent differences among rootstocks. Light transmission was greatest in trees in the 3-wire trellis and the central leader systems and on M.9EMLA rootstock. Net photosynthesis (Pn) was greatest in trees in the 3-wire trellis system and was lowest in trees on M.9EMLA rootstock.
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