Application of DNDC Model to Estimate N₂O Emissions from Green Tea Fields in Japan

곽유리나,Kazuhiko Kobayashi 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.2

Heavy doses of N fertilizers are commonly applied to green tea fields in Japan, and cause large amount of nitrate leaching in ground water and emission of ammonia and nitrous oxide (N₂O) to the atmosphere. The Denitrification and Decomposition (DNDC)model was tested against experimental data on N₂O emissions from the tea field in Nishio, Aichi, Japan. There were reasonable agreements between the simulated and measured values of N₂O emissions for this site. The model was then applied for estimating the environmental impacts as affected by farm management practices, climate change, and soil properties. The model results were assessed with respect to major indicators of agro-ecosystems including crop yield, soil organic carbon sequestration, nitrate leaching loss, and N₂O emission. The results indicated that use of compost significantly reduced nitrate leaching and N₂O emissions in comparison with N fertilizer. When soil pH and texture shifted to non-acidic and coarser soil, N₂O emission increased; and a change in temperature and precipitation affected N₂O emission, nitrate leaching, and SOC sequestration. This study thus revealed the biogeochemistry model as a powerful tool in addressing the complex efficacy of the alternative farm management practices in tea fields across various climate and soil conditions.

폐쇄형 육묘 시스템에서의 파프리카 묘 생산에 적합한 재배 기간 및 암면 블록의 크기

곽유리나,김동섭,전창후 (사) 한국생물환경조절학회 2014 생물환경조절학회지 Vol.23 No.2

This study was conducted to investigate the effect of cultivation period and rockwool block size on the growth andearly yield of paprika transplants grown in a closed transplant production system. Paprika seeds were sown and germinatedin three different size of rockwool blocks (45 × 40 × 35, 70 × 70 × 60, 100 × 100 × 65mm) and cultivated in a closed transplantproduction system for 23, 30, and 37 days after sowing. Paprika transplants were cultivated using 100 × 100 × 65mmrockwool blocks in a greenhouse following a conventional and typical production method for comparing with the growth ofpaprika transplants grown in a closed transplant production system. Also, we transplanted paprika transplants grown for 23,30, and 37 days in a closed transplant production system and greenhouse to rockwool slabs and investigated fresh weight offruits and yield 125 days after sowing. The growth of paprika transplants grown in 70 × 70 × 60mm rockwool blocks in aclosed transplant production system was highest, and the quality of paprika transplant grown in a closed transplant productionsystem was better than in a greenhouse. Rockwool block size and cultivation period in a closed transplant productionsystem did not affect fresh weight of fruits, however, yield was largest when paprika transplants were cultivated using70 × 70 × 60 and 100 × 100 × 65mm rockwool blocks for 23 days in a closed transplant production system. These resultssuggest that decreasing rockwool block size and cultivation period can be strategically used to enhance transplant quality andyield of paprika, as paprika transplants were cultivated in a closed transplant production system. 본 연구는 폐쇄형 육묘 시스템에서의 파프리카 묘 생산에 적합한 재배 기간 및 암면 블록의 크기를 구명하기 위하여 수행되었다. 파프리카 종자를 세 가지 크기의 암면블록(45 × 40 × 35, 70 × 70 × 60, 100 × 100 × 65mm)에 파종하고 형광등을 인공 광원으로 이용하는 폐쇄형 육묘시스템에서 23, 30, 37일간 재배하였다. 또한, 온실에서100 × 100 × 65mm의 암면 블록을 이용하여 관행 재배한파프리카 묘를 온실 처리구로 설정하였다. 육묘 일수와관계없이 70 × 70 × 60mm의 암면 블록에서 육묘한 파프리카 묘의 지상부, 지하부 생육 및 R/S율이 가장 높았으며, 온실에서 관행 재배한 처리구보다 폐쇄형 육묘 시스템에서 재배한 파프리카 묘의 소질이 우수하였다. 폐쇄형 육묘 시스템과 온실에서 23, 30, 37일간 재배한 파프리카 묘를 암면 슬라브에 정식하고 초기 수량을 조사하였다. 파종후 125일의 파프리카 평균 과중은 암면 블록 크기와 육묘일수의 영향을 거의 받지 않았으나, 단위 면적당 수량은70 × 70 × 60와 100 × 100 × 65mm의 암면 블록을 이용하여23일간 폐쇄형 육묘 시스템에서 재배한 처리구에서 가장높았다. 따라서, 폐쇄형 육묘 시스템에서 파프리카 육묘시 관행 재배보다 작은 70 × 70 × 60mm의 암면 블록을 이용하고 육묘 일수를 23일로 단축하여도 우수한 품질의 파프리카 묘를 생산할 수 있음을 확인하였다.

Growth and Development of Grafted Cucumber Transplants as Affected by Seedling Ages of Scions and Rootstocks and Light Intensity during Their Cultivation in a Closed Production System

곽유리나,박선우,전창후 한국원예학회 2014 원예과학기술지 Vol.32 No.5

The objective of this study was to determine the effects of seedling ages of scions and rootstocks for grafting andlight intensity during their cultivation in a closed transplant production system on the growth and development of graftedcucumber transplants. Cucumber scions and rootstocks were cultivated under 5 photosynthetic photon flux (PPF) levels: 100,140, 180, 230, and 280 μmol・m-2・s-1in a closed transplant production system. The scions were grafted onto the rootstocksat 8, 9, 10, 11, and 12 days after sowing (DAS). Hypocotyl length of scions and rootstocks decreased significantly as PPFincreased, and an increase in dry weight with increasing PPF was more pronounced in scions. After grafting, cucumber transplantswere grown in a greenhouse until 22 DAS and were then transplanted for investigation of their growth and development. Plant height, leaf area, and fresh weight of cucumber transplants grafted at 8, 9, and 10 DAS were greater, but light intensityduring cultivation of scions and rootstocks did not significantly affect the early growth of cucumber transplants after grafting. The number of female flowers in grafted cucumber after transplanting was highest when scions and rootstocks were cultivatedunder PPF 140 and 180 μmol・m-2・s-1and were grafted at 8 DAS. These results indicate that controlling environmental conditionsin a closed transplant production system during the production of scions and rootstocks can advance grafting time and promotethe growth and development of grafted cucumber transplants.

Root-zone Cooling Affects Growth and Development of Paprika Transplants Grown in Rockwool Cubes

곽유리나,김동섭,전창후 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.1

The possibility of improving the efficiency of transplant production during a summer season was studied byapplying partial cooling of the root-zone during the cultivation of paprika transplants in a greenhouse. Paprika seedlingsproduced in a closed transplant production system were transferred to rockwool cubes, and cool-water circulation systemsusing plastic and stainless pipes were tested in a greenhouse during a summer season. The root-zone temperature ofrockwool cubes and growth and development of paprika transplants as affected by root-zone cooling were investigated. When plastic pipes were used, the cooling efficacy by circulation of cool water (17°C) was the greatest and thetemperature of rockwool cubes decreased by 3.6°C during the day time on a sunny day. Partial cooling of the root-zoneenhanced root growth and increased number of flowers as compared with the transplants grown on uncooled rockwoolcubes. The results indicate that partial cooling of the root-zone can alleviate damages to transplants commonly causedunder high air temperature conditions, which could efficiently improve the paprika transplant production efficiency ingreenhouses during the summer season.

Changes in Quality and Vigour of Cucumber and Paprika Transplants as Affected by Storage Temperature under Dark Conditions

곽유리나,전창후 한국원예학회 2015 원예과학기술지 Vol.33 No.5

Cucumber and paprika transplants were stored at 9, 12, 15, and 18°C under dark conditions for 15 days and then grown in a greenhouse for 14 days after transplanting. To determine the effects of low storage temperature and long-term continuous darkness on the quality and vigour of transplants, we investigated the quality of transplants during storage and the growth of stored transplants after transplanting. In cucumber transplants, decreasing storage temperature reduced stem elongation and decrease in SPAD value. The quality of cucumber transplants stored at 9°C was well preserved during storage, but they did not survive after transplanting due to chilling damage. Growth and development after transplanting were significantly greater when cucumber transplants were stored at 12°C. In paprika transplants, the quality of transplants did not significantly differ before and after storage. After transplanting, there was no significant difference in the survival rate and growth, but the number of flower buds was greater in the paprika transplants stored at lower temperatures (9 and 12°C). These results indicate that the responses of transplants to the conditions of low temperature and darkness differed between cucumber and paprika, and storage temperature in darkness must be controlled carefully considering species-specific responses to reduce quality deterioration during storage and improve the recovery of transplants after transplanting.

친환경 농업의 분류 및 관련 용어의 정의

곽유리나,전창후 두레마을 친환경농업연구원 2005 친환경농업연구 Vol.7 No.2

Growth and Quality of Sprouts of Six Vegetables Cultivated under Different Light Intensity and Quality

곽유리나,김경구,황현승,전창후 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.4

Vegetable sprouts (alfalfa, broccoli, clover, kohlrabi, radish, and red radish) were cultivated under three monochromatic light regimes (red, green, and blue) with five different light intensities (0, 12.5, 25, 50, and 100 μmol·m-2·s-1) to investigate the effects of light intensity and quality on the growth and total phenolic content of the vegetable sprouts. The light quality and intensity had a direct effect on hypocotyl elongation in vegetable sprouts. Increasing blue light intensity enhanced suppression of hypocotyl elongation in all of the vegetable sprouts. Red light also reduced hypocotyl length in alfalfa and clover sprouts comparing those grown in darkness. The fresh weight of broccoli and radish sprouts markedly increased when red light intensity was 100 μmol·m-2·s-1; however, light use efficiency (LUE) decreased with increasing light intensity. Total phenolic content was reduced by increasing red light intensity in alfalfa and red radish sprouts.

An Ozone Micro-bubble Technique for Seed Sterilization in Alfalfa Sprouts

곽유리나,김경구,황현승,전창후 한국원예학회 2014 원예과학기술지 Vol.32 No.6

The efficacy of ozone micro-bubble water (OMBW) in reducing microbial populations on alfalfa seeds was investigatedin this study. We observed the surface of alfalfa seeds using microscopy and found that many cracks and crevices existingon the surface could harbor pathogens. Alfalfa seeds were treated with tap water (TW), micro-bubble water (MBW), ozonewater (OW), ozone micro-bubble water (OMBW), and chlorine water (CL) for 5 min, and total microbial population, E. coli andSalmonella spp. colonies were determined. Also, the sterilized seeds were germinated and cultivated for 5 d after sowing toinvestigate the percentage of germination and the growth of alfalfa sprouts. The treatments with OMBW and CL were mosteffective in reducing total microbial populations and E. coli was eliminated by OW, OMBW, and CL treatments. CL treatmentreduced t he p ercentage of g ermination a nd f resh w eight of a lfalfa s prouts, but OMBW d id n ot c ause a ny n egativ e effects onthe germination and growth of alfalfa sprouts. These results indicate that OMBW can be used as an effective sanitizer for eliminatingseed-borne pathogens without detrimental effects on seed viability.

공립유치원의 원격수업 운영실태 및 교사의 인식

곽유리,최일선 한국육아지원학회 2022 한국육아지원학회 학술대회지 Vol.2022 No.5

농업생태계 내 물질 순환 및 생물지화학적 모델의 이용

곽유리나 ( Gwak Yu-ri-na ) 한국농공학회 2012 韓國農工學會誌 : 전원과 자원 Vol.54 No.4