Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Analysis of Soil and Leaf Characteristics of Pear Orchards with Lime-Induced Chlorosis Leaves

배나무 엽 황화증상 발생 과원의 토양 및 엽 특성 분석

  • In Bog Lee (Horticultural and Herbal Crop Environment Division, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Dae Ho Jung (Division of Smart Horticulture, Yonam College) ;
  • Pyoung Ho Yi (Horticultural and Herbal Crop Environment Division, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Seung Tak Jeong (Horticultural and Herbal Crop Environment Division, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Yoon Kyeong Kim (Planning and Coordination Division, National Institute of Horticultural and Herbal Science, Rural Development Administration)
  • 이인복 (농촌진흥청 국립원예특작과학원 원예특작환경과) ;
  • 정대호 (연암대학교 스마트원예학과) ;
  • 이평호 (농촌진흥청 국립원예특작과학원 원예특작환경과) ;
  • 정승탁 (농촌진흥청 국립원예특작과학원 원예특작환경과) ;
  • 김윤경 (농촌진흥청 국립원예특작과학원 기획조정과)
  • Received : 2023.11.24
  • Accepted : 2023.12.05
  • Published : 2023.12.31
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Abstract

Physiological disorders in pear fruit are mainly caused by problems during the growing season, such as lack of calcium in the soil, poor drainage, low porosity, vigorous pruning, and excessive fruiting. In this study, soil physicochemical properties and leaf characteristics were analyzed in pear orchards in four regions of Korea where chlorosis symptoms occurred to determine the causes of chlorosis. The color of chlorotic leaves was diagnosed using the naked eye or SPAD and Hunter values. The soil of the chlorotic orchard had a significantly higher soil pH than that of the regular orchard. Although adequate soil depth was not significantly associated with chlorosis, combined with over-fertilization of the soil with lime, it could potentially impair plant iron uptake. Chlorotic leaves had significantly lower iron and calcium contents and significantly higher magnesium contents than those of regular leaves. Therefore, the intensive occurrence of chlorosis during secondary shoot development around June and July when it is hot and humid may be due to impaired iron and calcium absorption, leading to physiological disorders. To solve this problem, avoiding the over-application of lime and applying foliar fertilizers containing chelated iron is recommended.

본 연구에서는 황화증상이 발생한 전국 4개 지역의 배 과원에서 토양 특성과 잎의 특성을 분석하여 황화증상의 원인을 구명하고자 하였다. 황화증상이 발생한 잎의 색은 육안 또는 SPAD와 Hunter 값을 통해 진단할 수 있었다. 황화증상이 발생한 과원의 토양은 정상 과원에 비해 토양의 pH가 유의하게 높았다. 유효토심은 황화증상과 큰 관계가 없었으나, 토양에 석회 등이 과다 시비되는 조건과 결합되어 식물체의 철 흡수를 저해할 가능성이 있다. 황화증상이 발생한 잎에서는 정상엽에 비해 철과 칼슘 함량이 유의하게 낮았고, 마그네슘 함량이 유의하게 높았다. 따라서 고온다습한 6-7월경 2차 신초 발달이 일어나는 시기에 집중적으로 황화증상이 발생하는 것은 철과 칼슘의 흡수 저해와 밀접한 관계가 있는 것으로 판단된다. 이를 해결하기 위해서는 석회의 과다 시비를 피하고, 철 성분을 함유한 비료를 엽면시비하거나 수관부 토양에 관주하는 방식이 적합하다.

Keywords

Acknowledgement

This work was supported by the "Research Program for Agriculture Science & Technology Development (Project No. PJ01509504)" of the Rural Development Administration, Republic of Korea.

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