Volume 57 Number 4 Article 26
Year 2003 Month 10
Title: Performance of 'Rakuraku Fuji' Apple Trees on JM.7 and M.9Nagano Rootstocks, and M.9Nagano/Marubakaido Interstem Combinations in Japan
Authors: H. Tamai, H. Komatsu, H. Koike, T. Ono and I. Shigehara
Abstract:
Trees of 'Rakuraku Fuji' apple (Malus X domestica Borkh.) on JM.7, M.9Nagano rootstocks and
M.9Nagano/Marubakaido (Malusprunifolia Bork. var. rmgo Asami) interstem combination were evaluated for growth and productivity in a high density orchard situation on a deep volcanic ash soil in
Azumi, Nagano, Japan.
By the 5th leaf, trees on JM.7 and M.9Nagano/Marubakaido exceeded the alloted
space (2×4 m), and every other tree in the rows was removed following harvest.
After 8 growing
seasons, trees on JM.7 and M.9Nagano/Marubakaido had a similar trunk cross-sectional area (TCA) and
were larger than trees on M.9Nagano.
Trees on M.9Nagano had a greater cumulative yield efficiency
through the 6th year.
In the 8th year, trees on M.9Nagano/Marubakaido had a greater cumulative yield
efficiency than trees on JM.7 and M.9Nagano.
Calculated yields per ha based on 2×4 m spacing (1250
trees per ha) of trees on M.9Nagano/Marubakaido and JM.7 were greater than those on M.9Nagano
through the 5th year after which trees were thinned to 625 per ha.
In years 6 through 8, trees on
M.9Nagano had the highest calculated yield per ha.
Trees on JM.7 and M.9Nagano/Marubakaido were
too vigorous for high density planting with less than 2×4 m spacing on the deep volcanic ash soils found
in Nagano.
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