Relationship among the Planting Density, Tree Growth and Fruit Quality of Columnar-type Apple Tree 'Tuscan'

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  • Inomata Yuji
    Department of Apple Research, National Institute of Fruit Tree Science (NIFTS)
  • Kudo Kazunori
    Department of Apple Research, National Institute of Fruit Tree Science (NIFTS)
  • Kuroda Haruyuki
    Department of Apple Research, National Institute of Fruit Tree Science (NIFTS)
  • Masuda Tetsuo
    Department of Apple Research, National Institute of Fruit Tree Science (NIFTS)
  • Bessho Hideo
    Department of Apple Research, National Institute of Fruit Tree Science (NIFTS)
  • Wada Masato
    Department of Apple Research, National Institute of Fruit Tree Science (NIFTS)
  • Suzuki Kunihiko
    Department of Apple Research, National Institute of Fruit Tree Science (NIFTS)

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  • カラムナータイプリンゴ‘タスカン’における栽植密度と生育，果実品質との関係
  • カラムナータイプリンゴ タスカン ニ オケル サイショクミツド ト セイイク カジツ ヒンシツ ト ノ カンケイ

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Abstract

The relationships among planting density, tree growth, and fruit quality spaced ‘Tuscan’ apple grafted on Marubakaido (Malus. prunifolia Bork. var. ringo Asami) rootstock were studied. The percent instantaneous incident photosynthetic photon flux density decreased at the middle and bottom canopy; this decrease was more pronounced in the higher density planting. The foliar volume of shoots at the middle and bottom of the canopy decreased with tree age. Likewise, fewer flower buds differentiated in the lower, shady portion of the canopy. It was clear that the relationship among tree growth factors, yield and plant density (ρ), could be represented by the following reciprocal equation: 1/X = Aρ + B (where X depends on tree growth factors, whereas A and B depend on cultivation practices). Moreover, fruit weight (W), Brix % (B) and fruit acidity (A) and ρ could be represented by the following equation; W = K1ρ−a1, B = K2ρ−a2, A = K3ρ−a3. In conclusion, we belive that the canopy expansion and fruit quality decreased because of the worsening light environment in proportion to the high planting density. Thus, it is important to balance planting density with a good light environment in the canopy to accrue benefits from the columnar growth habit of ‘Tuscan’.<br>

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