• 원예과학기술지
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• 제30권2호
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• pp.123-128
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• 2012

A two year study was conducted on the effects of composted pig manure applications on organically managed intermediate-day onion ($Allium$ $cepa$ L.) with mid-season production. The manure application rates were 0, 4.0, 6.0, and 8.0 $ton{\cdot}ha^{-1}$, and accompanied by organic fertilizer with 240 $kg{\cdot}ha^{-1}$ nitrogen for all treatments. There was a positive linear effect on the marketable bulb yield with increasing applications of pig manure. However, pig manure rates of 6.0 or 8.0 $ton{\cdot}ha^{-1}$ did not affect the marketable yields or bulb weights at harvest. There was no significant difference between pig manure application rates and mineral concentration or nutrient uptake in onion bulbs. Soil pH and electric conductivity (EC) were lower at harvest compared to preplant soil, while exchangeable potassium and calcium contents increased at harvest. However, there were no significant effects on soil pH, EC, and organic matter or exchangeable cations caused by different pig manure application rates. Mineralized $NO_3$-N content was not affected by pig manure application rates except at transplanting and 129 day after transplanting. Based on the results of this study, when organic fertilizer is applied at a rate of 240 $kg{\cdot}ha^{-1}$ N, 6.0 $ton{\cdot}ha^{-1}$ composted pig manure should be adequate for producing onions using an organic production system.

• 원예과학기술지
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• 제34권6호
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• pp.807-817
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• 2016

Many onion growers and researchers assert that differences in soil type, agricultural practices, weather, and duration of prolonged onion cultivation in a particular field could affect onion bulb quality. This study evaluates the bulb quality of onions grown in different regions and determines the correlations between bulb characteristics and postharvest loss during cold and ambient storage. Soil and onion bulbs were collected from fields in six onion growing regions in Korea, during the growing season of 2011-2012. The fresh weight, dry matter content, and carbon (C), sulfur and magnesium contents of the onion bulbs were significantly affected by the location in which they were grown. Bulbs grown in Muan had the greatest number of scales, thinnest scale thickness, and the highest total soluble solids (TSS) and total flavonoids (TF). Bulbs originating from Jecheon had the lowest pyruvic acid (PA), total phenolics and TF. Storage loss of bulbs from the different regions was similar in refrigerated storage, but differed in ambient temperature storage. Bulb fresh weight was positively correlated with scale thickness (r = 0.617) and cold storage loss (CSL; r = 0.398). Dry matter content was positively correlated with C (r = 0.958) and TF (r = 0.256) contents, while it was negatively correlated with CSL (r = -0.424). CSL was primarily affected by the fresh weight, as well as the dry matter, C, and PA contents of the bulbs, while ambient storage loss was primarily influenced by the amount of TSS.

• 생물환경조절학회지
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• 제18권2호
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• pp.160-165
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• 2009

본 연구는 고온과 고습 조건 하에서 양파 화구의 총 단백질 발현과 원형질막 $H^{+}ATPase$ 영향을 조사하고자 조생종 '신선황'과 중생종 '맵시황'를 이용하여 실험을 수행하였다. '신선황'과 '맵시황' 품종의 양파 회구 개화전, 반개화, 그리고 만개 단계에서 단백질의 양생에는 차이를 보이지 않았지만 결실 단계에서는 유도 및 비유도되는 단백질이 현저하게 나타났다. 양파 화구 개화 후 실시한 고온과 고습처리 18일째의 양파두 품종의 단벡질도 현저하게 감소하였고 특히 고온처리구에서 더 감소되는 경향을 보였다. 원형절막 $H^{+}ATPase$ 발현을 western-blot으로 살펴본 결과, '신선황' 과 '맵시황'의 경우 대조구에서 원형질막 $H^{+}ATPase$ 단백질 발현이 유지 되는 반면에, 고온처리구에서는 두품종 모두 원형질막 $H^{+}ATPase$가 발현 되지 않았다. 고습처리구에서 중생종 '맵시황'약 원형질막 $H^{+}ATPase$는 발현 되었는데 조생종 '신선황'에서 발현되지 않았다. 이는 양파 종자 성숙단계에서 고온 조건을 조우하면 고습처리 보다는 단백질 및 원형질막의 $H^{+}ATPase$피해가 더 심각함을 보여 주는 결과이다.