충북 청주 일원에 1990년 4월 24-27일, 4일간에 걸쳐 조상최저온도가 -5.7--8.2$^{\circ}C$로 급강하하여 연구 및 개엽상태에 있는 뽕나무에 심한 늦서리 피해를 주었다. 본 조사에서는 품종별로 피해와 회복 정도를 파악하기 위하여 개량뽕, 청일뽕, 잠상 21호 및 22호 등 4개 품종에 대하여 조사를 한 결과 다음과 같았다. 1. 예년의 기상과 비교해 보면, 4월 하순은 기온이, 5월 상하순에는 일조가, 5월 하순에는 기온 및 강우량이, 6월 상순에는 다시 강우량이 모두 떨어져 4월하순부터 6월상순까지 계속 뽕나무의 회복에 불량한 환경을 보였다. 2. 서리가 내린 당시 잠상 21호는 2-3개엽으로 가장 빨랐으며, 개량뽕과 잠상 22호는 1-2개엽, 청일뽕은 연구-1개엽으로 가장 늦었다. 3. 서리가 내린 15일 후인 5월 12일 1개엽을 보여서, 예년보다 19일 늦었으며, 이런 차는 수확때인 6개엽까지 계속되었다. 4. 신소장은 전년대비 50-58%였으며, 개량뽕은 가장 낮아서 50%였고, 잠상21호는 58%로 가장 높았다. 5. 엽수는 전년대비 52-67%였으며, 개량뽕은 가장 낮아서 52%였고 잠상 21호는 67%로 가장 높았으며, 앞의 길이와 폭은 전년대비 80%내외였으며, 품종간의 차이는 5%이내였다. 6. 신소량은 전년대비 44-63%, 정엽량은 39-61%이었으며, 개량뽕이 가장 낮은 품종이었고 잠상 21호가 가장 높은 품종이었다. 청일뽕은 개량뽕과 비슷하였고, 잠상 22호는 21호와 비슷하였다. 7. 조상량에 대한 신초엽량 비는 예년의 75%에서 55-61%로 떨어졌고, 신소엽량에 대한 정엽량은 예년의 72-76%로 5-10%로 떨어졌다. 8. 수엽량은 전년 대비 잠상 22호가 57%로 가장 많이 감소하였고 개량뽕 61%, 잠상 21호 64%, 청일뽕 72%이었고, 절대수량은 개량뽕이 827kg/10a으로 가장 적었으며, 다른 품종은 1,000-1,050kg/10a 정도였다.
충북 청주 일원에 1990년 4월 24-27일, 4일간에 걸쳐 조상최저온도가 -5.7--8.2$^{\circ}C$로 급강하하여 연구 및 개엽상태에 있는 뽕나무에 심한 늦서리 피해를 주었다. 본 조사에서는 품종별로 피해와 회복 정도를 파악하기 위하여 개량뽕, 청일뽕, 잠상 21호 및 22호 등 4개 품종에 대하여 조사를 한 결과 다음과 같았다. 1. 예년의 기상과 비교해 보면, 4월 하순은 기온이, 5월 상하순에는 일조가, 5월 하순에는 기온 및 강우량이, 6월 상순에는 다시 강우량이 모두 떨어져 4월하순부터 6월상순까지 계속 뽕나무의 회복에 불량한 환경을 보였다. 2. 서리가 내린 당시 잠상 21호는 2-3개엽으로 가장 빨랐으며, 개량뽕과 잠상 22호는 1-2개엽, 청일뽕은 연구-1개엽으로 가장 늦었다. 3. 서리가 내린 15일 후인 5월 12일 1개엽을 보여서, 예년보다 19일 늦었으며, 이런 차는 수확때인 6개엽까지 계속되었다. 4. 신소장은 전년대비 50-58%였으며, 개량뽕은 가장 낮아서 50%였고, 잠상21호는 58%로 가장 높았다. 5. 엽수는 전년대비 52-67%였으며, 개량뽕은 가장 낮아서 52%였고 잠상 21호는 67%로 가장 높았으며, 앞의 길이와 폭은 전년대비 80%내외였으며, 품종간의 차이는 5%이내였다. 6. 신소량은 전년대비 44-63%, 정엽량은 39-61%이었으며, 개량뽕이 가장 낮은 품종이었고 잠상 21호가 가장 높은 품종이었다. 청일뽕은 개량뽕과 비슷하였고, 잠상 22호는 21호와 비슷하였다. 7. 조상량에 대한 신초엽량 비는 예년의 75%에서 55-61%로 떨어졌고, 신소엽량에 대한 정엽량은 예년의 72-76%로 5-10%로 떨어졌다. 8. 수엽량은 전년 대비 잠상 22호가 57%로 가장 많이 감소하였고 개량뽕 61%, 잠상 21호 64%, 청일뽕 72%이었고, 절대수량은 개량뽕이 827kg/10a으로 가장 적었으며, 다른 품종은 1,000-1,050kg/10a 정도였다.
The recovery of mulberry from a late frost (April 24 to 27) was investigated for four varieties : Kaeryangppong, Cheongilppong, and Jamsang 21 in Cheongju area, Chungbuk Province. 1. Unfavourable meteorlogical conditions for recovery of mulberry followed the early late frost : lower than normal t...
The recovery of mulberry from a late frost (April 24 to 27) was investigated for four varieties : Kaeryangppong, Cheongilppong, and Jamsang 21 in Cheongju area, Chungbuk Province. 1. Unfavourable meteorlogical conditions for recovery of mulberry followed the early late frost : lower than normal temperatures in mid-April, less sunshine in early and mid-Jay, lower temperatures and early and less precipitation in late-May, and less precipitation than normal in early June. 2. Jamsang 21 grew to the 2-3 leaf stage first, at which time Kaeryangppong and Jamsang 22 were at the 1-2 leaf stage, and Cheongilppong was at the swallow-bill shape-1 leaf stage. 3. The first leaf stage occurred on May 12, 15 days after the frost and, 19 days later in an average year. The difference lasted until the harvesting season, the 6 leaf stage. 4. Young shoot length was 50-58% of that in 1989. Kaeryangppong was the shortest at 50% and the Jamsang 21 highest at 58% of 1989 values. 5. Leaf number was 52-67% that in 1989. Kaeryangppong was the lowest at 52% and the Jamsang 21 highest at 67% of 1989 values. 6. Young shoot and leaf weight was 44-63%, and leaf weight 39-61%, compared to 1989. Kaeryangppong and Cheongilppong were the lowest, Jamsang 21 and Jamsang 22 were the highest, compared to 1989 data. 7. Young shoot length was 50-58% compared with 1989. Kaeryangppong was the lowest as 50%, the highest Jamsang 21 as 58%. 8. Number of leaf was 52-67% compared with 1989. Kearyangppong was the lowest as 52%, the highest Jamsang 21 as 67%. 9. Young shoot and leaf wight was 44-63%, and leaf weight was 39-61% compared with 1989. Kaeryangppong was the lowest, lowest, Jamsang 21 was the highest, Cheongilppong was similar with Kaeryangppong and Jamsang 22 was similar with Jamsang 21. 10. Rate of young shoot and leaf weight to total weight decreased from 75% in 1989 to 55-61% in 1990. Rate of laef weight to young shoot decreased from 72-82% to 67-71%, showed 5-10% decrease. 11. Leaf yield decreased highly in Jamsang 22 as 57% compared with 1989. Kearyangppong 61%, Jamsang 21 64%, Cheonglppong 72%. Leaf yield was 827kg/10g in Kaeryangppong, 1, 000-1, 050kg/10a in the other varieties.
The recovery of mulberry from a late frost (April 24 to 27) was investigated for four varieties : Kaeryangppong, Cheongilppong, and Jamsang 21 in Cheongju area, Chungbuk Province. 1. Unfavourable meteorlogical conditions for recovery of mulberry followed the early late frost : lower than normal temperatures in mid-April, less sunshine in early and mid-Jay, lower temperatures and early and less precipitation in late-May, and less precipitation than normal in early June. 2. Jamsang 21 grew to the 2-3 leaf stage first, at which time Kaeryangppong and Jamsang 22 were at the 1-2 leaf stage, and Cheongilppong was at the swallow-bill shape-1 leaf stage. 3. The first leaf stage occurred on May 12, 15 days after the frost and, 19 days later in an average year. The difference lasted until the harvesting season, the 6 leaf stage. 4. Young shoot length was 50-58% of that in 1989. Kaeryangppong was the shortest at 50% and the Jamsang 21 highest at 58% of 1989 values. 5. Leaf number was 52-67% that in 1989. Kaeryangppong was the lowest at 52% and the Jamsang 21 highest at 67% of 1989 values. 6. Young shoot and leaf weight was 44-63%, and leaf weight 39-61%, compared to 1989. Kaeryangppong and Cheongilppong were the lowest, Jamsang 21 and Jamsang 22 were the highest, compared to 1989 data. 7. Young shoot length was 50-58% compared with 1989. Kaeryangppong was the lowest as 50%, the highest Jamsang 21 as 58%. 8. Number of leaf was 52-67% compared with 1989. Kearyangppong was the lowest as 52%, the highest Jamsang 21 as 67%. 9. Young shoot and leaf wight was 44-63%, and leaf weight was 39-61% compared with 1989. Kaeryangppong was the lowest, lowest, Jamsang 21 was the highest, Cheongilppong was similar with Kaeryangppong and Jamsang 22 was similar with Jamsang 21. 10. Rate of young shoot and leaf weight to total weight decreased from 75% in 1989 to 55-61% in 1990. Rate of laef weight to young shoot decreased from 72-82% to 67-71%, showed 5-10% decrease. 11. Leaf yield decreased highly in Jamsang 22 as 57% compared with 1989. Kearyangppong 61%, Jamsang 21 64%, Cheonglppong 72%. Leaf yield was 827kg/10g in Kaeryangppong, 1, 000-1, 050kg/10a in the other varieties.
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