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RISS 인기검색어
- 검색키워드
- 저자 : 朴鍾成(Park Jong Seoung) (검색결과 3 건)
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人工酸性 降雨가 大豆(Glycine max(L.) Merr)의 生長과 收量에 미치는 影響
吳福來,鄭淳柱,朴鍾成 全南大學校 農漁村開發硏究所 1986 農業科學技術硏究 Vol.21 No.-
This experiment was performed to determine the responses of soybean plants (Glysine max (L.) Merr) to simulated acid rain at various pH levels. pH levels of simulated acid rain ranged from pH 2 to pH 5. 1he amount of acid precipitation was 30㎜/40min by pH levels, and water drop size was 0.l㎜at the pressure of 2.5 bars. Sprayer was installed at 1m high from ground level and sprayed 1 time per week for six weeks. A general decrease in plant height, leaf number, leaf area and shoot dry freight was observed with decreasing pH and increasing H₂SO₄deposition. The trifoliate leaf area appeared to be the most sensitive growth parameter recorded. As acidity increased, a definite reduction in total chlorophyll, nodule weight and yield were observed across the pH gradient. Interrelationship among agronomic characters as affected by decreasing pH levels showed the significantly positive correlations regardless of characters recorded. This suggested. that one character affected greatly to the other characters. Chemical components of soil treated with simulated acid rain were not significant differences in phosphorous, potassium, calsium, magnesium and cation exchange capacity(CEC) except for pH and organic matter at 45 days after treatment.
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印茂成,朴鍾聲,劉勝憲 충남대학교 농업과학연구소 1985 農業技術硏究報告 Vol.12 No.2
In order to get information on the ecology of rice false smut, germination ability and pathogenicity of sclerotia and chlamydospores of the pathogen, environmental conditions affecting the disease outbreak and varietal resistance have been investigated. 1. The degree of outbreak of rice false smut was higher in the upland rice in comparison with the paddy field rice in respect to the number of affected grains per ear, the size and weight of smut balls formed on affected grains as well as the ratio of sclerotial formation produced on smut balls. 2. Germination percentage and days required for germination of overwintered sclerotia placed on the soil surface in July were 81% and 19 days, respectively, while those of overwintered sclerotia treated in May were 60-70% and 41 days. Sclerotia placed on the soil surface or under 1 cm depth of the soil surface and incubated at 25-30℃ were germinated well, whereas those placed under 3 cm or 5 cm depth of the soil surface were not germinated at all. Germinability and stroma productivity of sclerotia were reduced when the sclerotia were cutted into small pieces. 3. The average number of stroma formed on a sclerotium was six and that of perithecia formed in a stroma was about 50 to 140. 4. Percentage of germination of chlamydospores on the yellow balls was very high and was decreased as the color of the balls being darken with maturation. 5. Panicle of rice plants were successfully infected by injection inoculation with suspention of ascospores and chlamydospores of the pathogen to the sheaths at the booting stages, while seeding infection by spraying with suspensions of chlamydospores was unsuccessful. 6. More number of infected grains was distributed on basal parts of an affected ear than that of infected ones distributed upper parts of the ear, when the affected ear was divided into five parts from its basal portion to the apical of the ear. 7. The occurrence of the disease was more severe in the late maturing varieties of rice in comparison with the early maturing varieties. 8. When the level of nitrogen applied was increased, the incidence of disease increased, and the infection percentage of the disease was increased as the transplanting date was delayed. 9. The weight of panicles and 1000 kernels and the ratio of ripenness were reduced, and the contamination degree of grains with chlamydospores were increased as the number of smut balls per panicle were increased,
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