단근처리가 ‘후지’/M.9 사과나무의 수체 생장과 과실 품질에 미치는 영향 = Effect of Root Pruning on Tree Growth and Fruit Quality of ‘Fuji’/M.9 Apple Trees

국문 초록 (Abstract)

고밀식 사과재배에서 수세가 지나치게 강한 경우 단근을 통한 수세의 조기안정화 가능성을 보기 위하여 재식거리 3.5×1.5m인 7년차 ‘후지’/M.9 사과나무에서 본 시험을 실시하였다. 트랙터 부착형 뿌리 단근기를 이용하여 주간에서 약 30㎝ 떨어진 위치에서 30㎝ 깊이로 열간을 따라 발아기 양쪽, 만개기 양쪽, 만개기 한쪽, 유과기 한쪽에서 뿌리를 절단하는 처리와 대조구로 무처리를 두었다. 발아기 양쪽과 만개기 양쪽 단근 처리의 경우 총 신초 생장량이 무처리의 54.4%와 58.4%에 불과할 정도로 수세가 지나치게 약화되었고 과실비대도 크게 떨어져 당년의 주당 수량이 무처리의 75.4%와 70.9%로 감소하였다. 그러나 만개기 또는 유과기에 한쪽만 단근하는 경우 양쪽 단근에 비해 영양생장 억제효과는 낮았으나 과실비대 및 당년 주당 수량에서 감소는 크지 않았다. 반면에 수관 내 광환경은 뚜렷하게 개선되어 당도와 착색이 향상되었으며 익년 개화율도 높아졌다.

다국어 초록 (Multilingual Abstract)

‘Fuji’/M.9 apple trees were mechanically root pruned with tractor-mounted root pruner, parallel to the row of 30 ㎝ from the trunk, to the depth of 30 ㎝, 1) both sides at bud-break stage, 2) both sides at full bloom stage, 3) one side at full bloom stage, 4) one side at fruitlet stage, or 5) untreated as control. Root pruning both sides at bud-break stage or at full bloom stage reduced vegetative growth and yield so much as total shoot length by 54.4% or 58.4% and yield per tree by 75.4% or 70.9%, respectively, compared with controls. However, root-pruning one side parallel to the row at full bloom stage or at fruitlet stage was less affected on vegetative growth than root pruning both sides at bud-break or full bloom stage, not severely reducing fruit growth and yield per tree. Enhanced light penetration in the canopy by root pruning increased fruit color and soluble solid content in the year of treatment and tree flowering the following year.

목차 (Table of Contents)

• Abstract
• 서언
• 재료 및 방법
• 결과
• 고찰
• 초록
• 인용문헌

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