人蔘圃의 土壤細菌 分布에 關한 硏究 = A Study on the distribution of soil bacteria in Ginseng fields
저자
발행기관
忠南大學校 環境問題硏究所(THE INSTITUTE OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY Chungnam National University)
학술지명
環境硏究(RESEARCH REPORTS OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY)
권호사항
발행연도
1995
작성언어
Korean
KDC
539.9
자료형태
학술저널
수록면
127-146(20쪽)
제공처
소장기관
The Correlations between environmental influences on microorganisms in soil and its effects on dis-
ease development in ginseng field were studied to obtain some useful data for increasing ginseng produc-
tion and effective preventive measures against the root rot caused by soil-borne plant pathogenic micor-
organisms in soil. The diseased replanted ginseng fields were selected as the diseased field and the healthy
plot in first planted field selected as control in three major Korean ginseng producing areas such as Kum-
san, Goesan and Poonggi.
The physicochemical characteristics of the soil were analyzed, and micororganism suspectable for
root rot ginseng, and other general bacteria were investigated for their population density in various
soil conditions. Correlations between soil microbial populations, environmental factors were investigat-
ed.
The results were as follows:
1. The numbers of fluorescent Pseudomonas spp. were abundant in fall season in healthy first planted
field and abundant in hot summer season in the diseased replanted field. In comparison of the rela-
tive ratio of the fluorescent pseudomonas spp. in replanted field to healthy field in three areas, the
number of fluorescent Pseudomonas spp. were 1.1 to 3.8 times higher in replanted field, and also
in ratio of fluorescent Pseudomonas spp. to total bacteria, the numbers of fluorescent Pseudomonas
spp. populated in replanted field were 1.3 to 4.9 times higher.
Those bacterial cells were highly populated in 10-15 ㎝ depthof rhizosphere of ginseng.
2. The numbers of Erwinia spp. were significantly high in spring and fall in Kumsan and Poonggi.
In comparison of the relative ratio of Erwinia spp. in replanted field to healthy field in two areas,
the numbers of Erwinia spp. were 2.6 to 4.8 times higher in replanted field, and the numbers of Er-
winia spp. relative to total bacteria were 3 to 5 times higher in replanted field than first planted field.
In comparison of the relative ratioof Erwinia spp. to fluorescent Pseudomonas spp. in first planted
fields of two areas, the range of ratio of two different genus of bacteria was 2.5 : &, which was highly
discrepant, on the other hand the ratio in replanted field was 6 : 9, which was very close between the
two different genus of bacteria.
3. The numbers of total bacteria in each sampled soil were all high in June through September. There
was no significant difference in the vertical distributions of total bacteria according to the depth.
There was no significant difference between healthy first planted field and diseased replanted field,
in the numbers of total bacteria.
4. The contents of organic matters and phosphate in healthy first planted field were somewhat high,
and Phophate / Organic matter ratio and Mg content were high in diseased replanted field. All of the
soil samples showed a weak acidic pH of 4.5 to 5.7. Soil moisture content was increased during
winter and did not show any significant changes during the growing periods, showing 24.6% in heal-
thy first planted field and 19.5% in diseased replanted field respectively. Soil temperature was high-
est in July and August and lowest in January and February.
The Correlations between environmental influences on microorganisms in soil and its effects on disease development in ginseng field were studied to obtain some useful data for increasing ginseng production and effective preventive measures against the root rot caused by soil-borne plant pathogenic micororganisms in soil. The diseased replanted ginseng fields were selected as the diseased field and the healthy
plot in first planted field selected as control in three major Korean ginseng producing
areas such as Kumsan, Goesan and Poonggi.
The physicochemical characteristics of the soil were analyzed, and micororganism
suspectable for
root rot ginseng, and other general bacteria were investigated for their population
density in various
soil conditions. Correlations between soil microbial populations, environmental factors
were investigated.
The results were as follows:
1. The numbers of fluorescent Pseudomonas spp. were abundant in fall season in
healthy first planted
field and abundant in hot summer season in the diseased replanted field. In
comparison of the relative ratio of the fluorescent pseudomonas spp. in replanted field to
healthy field in three areas, the
number of fluorescent Pseudomonas spp. were 1.1 to 3.8 times higher in replanted
field, and also
in ratio of fluorescent Pseudomonas spp. to total bacteria, the numbers of
fluorescent Pseudomonas
spp. populated in replanted field were 1.3 to 4.9 times higher.
Those bacterial cells were highly populated in 10-15 ㎝ depth of rhizosphere of
ginseng.
2. The numbers of Erwinia spp. were significantly high in spring and fall in Kumsan
and Poonggi.
In comparison of the relative ratio of Erwinia spp. in replanted field to healthy
field in two areas,
the numbers of Erwinia spp. were 2.6 to 4.8 times higher in replanted field, and
the numbers of Erwinia spp. relative to total bacteria were 3 to 5 times higher in
replanted field than first planted field.
In comparison of the relative ratio of Erwinia spp. to fluorescent Pseudomonas
spp. in first planted
fields of two areas, the range of ratio of two different genus of bacteria was 2.5
: &, which was highly
discrepant, on the other hand the ratio in replanted field was 6 : 9, which was
very close between the
two different genus of bacteria.
3. The numbers of total bacteria in each sampled soil were all high in June through
September. There
was no significant difference in the vertical distributions of total bacteria
according to the depth.
There was no significant difference between healthy first planted field and
diseased replanted field,
in the numbers of total bacteria.
4. The contents of organic matters and phosphate in healthy first planted field were
somewhat high,
and Phophate / Organic matter ratio and Mg content were high in diseased
replanted field. All of the
soil samples showed a weak acidic pH of 4.5 to 5.7. Soil moisture content was
increased during
winter and did not show any significant changes during the growing periods,
showing 24.6% in heal-
thy first planted field and 19.5% in diseased replanted field respectively. Soil
temperature was high-
est in July and August and lowest in January and February.
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