Abstract
굴 패화석은 남해안의 굴양식 지역을 중심으로 발생량이 매년 증가되고 있으나 재활용율이 낮아 지역적으로 문제가 되므로 토양개량제로서 재활용하고자, 굴 패화석에 소량 포함되어 있는 중금속이 배추의 수량 및 중금속흡수 특성과 토양 내 중금속의 이동성에 미치는 영향을 조사하여 다음과 같은 결론을 얻었다. 굴 패화석 시용에 따른 토양 내 0.1N HCl 가용 중금속 함량은 토양오염 우려기준 이하로 굴 패화석을 다량시용 함에 따른 중금속성분의 토양 내 축적은 없었다. 굴 패화석 시용량 증가에 따라 토양 내 중금속성분의 총 함량은 미미한 수준에서 증가하는 경향을 보였으나, 대부분의 중금속성분은 생물체 흡수가 불가능한 광물 내 고정된 중금속성분의 형태(residual phase)로 존재하였다. 패화석의 시용량을 증가시킴에 따라 배추 체내 Cu, Mo, Zn의 흡수량은 다소 증가하는 경향을 보였으나 우려할 만한 수준은 아니었으며 생육기간 동안 육안적으로 특정 이온과다에 의한 독성증상은 나타나지 않았다. 이상의 결과를 통해 굴 패화석 시용은 토양의 pH개선, 중금속 축적의 배제는 물론, 작물 수량증대에 효과가 현저하므로 양질의 토양개량제로서 활용이 가능한 것으로 판단되었다. A large amount of oyster-shell waste has been illegally disposed at oyster farm sites along the southern coast of Korea, which already created serious environmental problems. Therefore, the study was undertaken to increase the consumption of oyster shell meal as a soil amendment. The effects of oyster shell meal on dynamics of heavy metals and uptake of heavy metals by spring Chinese cabbage were evaluated in silt loam soil (in Gyeongsang National University, Jinju, Gyeongnam-do, Korea), where 0, 4, 8, 12 and 16 Mg $ha^{-1}$ oyster-shell meal fertilizer were added. Lime treatment (2 Mg $ha^{-1}$) was selected as a control. In the results of this study, cabbage yields were increased by increasing levels of oyster-shell meal fertilizer. With increasing levels of oyster-shell meal fertilizer, total heavy metals concentrations were not significant among treatments. However, 0.1N HCl extractable heavy metals concentration was significantly reduced due to increasing of soil pH. A lot of portion (ca. $80{\sim}90%$) heavy metals fraction of all fractions was residual phase in soil after harvesting. The contents of Cu, Mo, Zn in cabbage were slightly increased by increasing levels of oyster shell meal fertilizer. However, there were no toxic symptoms of heavy metals during cultivation. Conclusively, it was estimated that oyster shell fertilizer could be a good amendment to increase productivity of crop and reduce uptake of heavy metals by crop and mobility of heavy metals in soil.
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Claims 9
Claim · model-written summary
Cabbage yield increased as oyster shell meal application increased.
- Taxon
- cabbage
Brassica oleracea var. capitatae0 - Treatment
- increasing levels of oyster-shell meal fertilizere0
- Outcome
- cabbage yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cabbage yields were increased by increasing levels of oyster-shell meal fertilizer”
Claim · model-written summary
Total soil heavy metal concentrations did not differ significantly among treatments.
Not reportedTaxonComparatorDirection
Verbatim
e0“total heavy metals concentrations were not significant among treatments”
Claim · model-written summary
Increasing soil pH with oyster shell meal significantly reduced acid-extractable soil heavy metals.
- Outcome
- 0.1N HCl extractable heavy metals concentratione0
- Direction
- reducede0
- Qualifier
- increasing of soil pHe0
Not reportedTaxonTreatmentComparator
Verbatim
e0“0.1N HCl extractable heavy metals concentration was significantly reduced due to increasing of soil pH”
Claim · model-written summary
Residual-phase metals accounted for about 80–90% of soil metal fractions after harvest.
- Outcome
- heavy metals fraction of all fractionse0
- Value
- $80{\sim}90%$e0
- Qualifier
- residual phase in soil after harvestinge0
Not reportedTaxon
Verbatim
e0“A lot of portion (ca. $80{\sim}90%$) heavy metals fraction of all fractions was residual phase in soil after harvesting”
Claim · model-written summary
Cabbage Cu content rose slightly with increasing oyster shell meal.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- increasing levels of oyster shell meal fertilizere0
- Outcome
- contents of Cue0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of Cu, Mo, Zn in cabbage were slightly increased by increasing levels of oyster shell meal fertilizer”
Claim · model-written summary
Cabbage Mo content rose slightly with increasing oyster shell meal.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- increasing levels of oyster shell meal fertilizere0
- Outcome
- Moe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of Cu, Mo, Zn in cabbage were slightly increased by increasing levels of oyster shell meal fertilizer”
Claim · model-written summary
Cabbage Zn content rose slightly with increasing oyster shell meal.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- increasing levels of oyster shell meal fertilizere0
- Outcome
- Zn in cabbagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of Cu, Mo, Zn in cabbage were slightly increased by increasing levels of oyster shell meal fertilizer”
Claim · model-written summary
No visible heavy-metal toxicity symptoms appeared during cultivation.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Outcome
- no toxic symptoms of heavy metals during cultivatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no toxic symptoms of heavy metals during cultivation”
e1“The contents of Cu, Mo, Zn in cabbage were slightly increased by increasing levels of oyster shell meal fertilizer”
Claim · model-written summary
The authors judge oyster shell fertilizer a useful amendment for crop productivity and metal mobility.
Verbatim
e0“oyster shell fertilizer could be a good amendment to increase productivity of crop and reduce uptake of heavy metals by crop and mobility of heavy metals in soil”
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