경북지방(慶北地方)사과원(園)의 사과나무 개식장해(改植障害) 발생여부(發生(與否)와 발생정도(發生程度)를 밝힐 목적(目的)으로 20년이상(年以上) 사과재배(栽培)가 계속되고 있는 23개(個) 사과원(園)의 토양(土壤)을 채취(採取)하여, 토양소독(土壤消毒)에 의(依)한 사과실생묘(實生苗)의 생장(生長)과 개식장해(改植障害)에 관련(關聯)된 것으로 알려진 몇 가지 요인(要因)을 조사(調査)한 결과(結果)는 다음과 같았다. 1. 사과실생묘(實生苗)의 생장(生長)은 6개(個) 과원(果園)에서 유의차(有意差)가 있었고, 가장 큰 차이(差異)를 나타낸 과원(果園)에서 38% 증가(增加)되었다. 2. 생체중(生體重)에서는 지하부(地下部)가 4개원(個園), 지하부(地下部)가 10개원(個園) 전생체중(全生體重)에서는 9개원(個園)에서 유의차(有意差)를 나타내었고, 지상부(地上部)에서 토양소독(土壤消毒)에 의(依)한 차이(差異)가 가장 현저(顯著)하였으며, 5개과원(個果園)에서는 50%이상(以上) 증가(增加)되었다. 3. 토양중(土壤中)의 Cu 및 As 농도(濃度), 토양선충수(土壤線蟲數)는 사과실생묘(實生苗)의 생장(生長)과 생체중(生體重)에 뚜렷한 영향(影響)을 미치지 않았다. 4. 토양(土壤) PH와 개식장해발생간(改植障害發生間)에는 뚜렷한 관계(關係)를 확인(認定)할 수 없었다.

In order to clarify the possibility of occurrence of apple replant disease and the severity of it in Kyungbuk area, 23 apple orchard soils older than 20 years were collected and growth response of apple seedlings in the soil was tested by soil fumigation. Some factors concerned with apple replant disease in some cases were also checked. The results were as follows. 1. Plant height of apple seedlings was significantly increased in 6 apple orchards and up to 38% in a most conspicuous case by soil fumigation. 2. Fresh weight of aboveground part(except leaves), underground part and whole plant(except leaves) of apple seedlings was significantly increased in 10,4 and 9 apple orchards, respectively by soil fumigation. The response of soil fumigation was pronounced in fresh weight of aboveground part of apple seedlings, more than 50% increase in 5 apple orchards. 3. The effects of available copper and arsenic content in soil and soil nematodes population on the plant height and fresh weight of apple seedlings were not recognized as important factors causing apple replant disease. 4. Effect of soil PH on the occurrence of apple replant disease was not recognized.

• 김규래(Dept. of Horticulture, Kyungpook National University) | Kim, Kyu Rae