Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Optimum Crop Load in Different Planting Densities of Adult 'Fuji'/M.9 Apple Tree for Preventing Biennial Bearing and Stabilizing Tree Vigor

성목기 '후지'/M.9 사과나무의 해거리 방지와 수세안정을 위한 재식거리별 적정 착과 수준

  • Received : 2013.08.13
  • Accepted : 2014.07.03
  • Published : 2015.02.28
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Abstract

This study was conducted in three years (7-9 years after planting) to investigate vegetative growth, yield, fruit quality, and return bloom for optimum crop load based on different planting densities of adult 'Fuji'/M.9 apple trees. As plant materials, 'Fuji'/M.9 apple trees planted at $3.5{\times}1.5m$ (190 trees per 10 a), $3.5{\times}1.2m$ (238 trees per 10 a), and $3.2{\times}1.2m$ (260 trees per 10 a) spacing and trained as slender spindles were used. The crop load was assigned to five different object ranges as follows: 55-64, 65-74, 75-84, 85-94, and 95-104 fruit per tree. TCA increment, total shoot growth, return bloom, yield per tree, and yield efficiency tended to increase as planting density decreased, and fruit weight and soluble solid content tended to increase as the object range of crop load decreased. Fruit red color tended to increase as shoot growth decreased. For apple trees planted with 238 trees and 260 trees per 10a, biennial bearing occurred when the crop load was over 85-94 and 75-84 fruits, respectively. However, biennial bearing did not occur when the crop load was 95-104 fruits in apple trees planted with 190 trees per 10a. Accumulated yield tended to increase as planting density and crop load increased, but that of biennial bearing did not show such a difference. Based on our results, optimum crop load recommendations are to set 95-104 fruits per tree in 'Fuji'/M.9 mature apple trees planted at 190 trees per 10a, 75-84 fruits per tree at 238 trees per 10a, and 65-74 fruits per tree at 260 trees per 10a.

본 시험은 성목기 '후지'/M.9 사과나무의 재식밀도별 적정 착과수를 조사하고자 영양생장, 생산량, 과실품질 및 이듬해 개화율을 3년(재식 7-9년차) 동안 조사하였다. 시험재료는 $3.5{\times}1.5m$(190주/10a), $3.5{\times}1.2m$(238주/10a), $3.2{\times}1.2m$(260주/10a)로 심어 세장방추형을 목표수형으로 관리하고 있는 '후지'/M.9 사과나무이었다. 목표 착과수 범위는 주당 55-64과, 65-74과, 75-84과, 85-94과, 95-104과의 5수준이었다. TCA 증가, 총 신초장, 이듬해 개화율, 주당 생산량 및 수량 효율은 재식밀도가 낮을수록 증가하는 경향이 있었고, 과중과 가용성고형물 함량은 목표 착과수준이 낮을수록 증가하는 경향이 있었다. 착색은 신초생장이 감소할수록 증가하는 경향이 있었다. 해거리는 238주과 260주 재식구의 주당 과실수가 각각 85-94과, 75-84과 이상이 되면 발생하였다. 그러나 190주 재식구는 주당 95-104과 정도 되어도 해거리가 발생하지 않았다. 누적 생산량은 재식밀도 및 목표 착과수준이 높을수록 많아지는 경향이 있었으나, 해거리가 발생한 착과구들 간의 차이는 없었다. 결론적으로 190주로 재식된 '후지'/M.9 사과나무의 성목기 적정 결실량은 95-104개, 238주 재식구는 75-84개, 260주 재식구는 65-74개 범위가 적당할 것이라고 판단되었다.

Keywords

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