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장동칠,정진철,이용범 (사) 한국생물환경조절학회 2006 시설원예‧식물공장 Vol.15 No.4
A potato (Solanum tuberosum L. cv. Superior) cultivar was grown in aeroponic cultivation sys-tem to investigate the effect of rot zone cooling in sumer. Based on their nutrient uptake, growthresponses, and tuberization, the possibilities for potato seed production were determined. Although shootgrowth and early tuberization increased in the conventional non-cooling root zone system (root zone temper-ature of 25±2oC), stolon growth, photosynthesis, transpiration rate and number of tubers produced werehigher in the cooling root zone system (20±2oC) than in the non-cooling system. Increasing root zone tem-perature above 25oC stimulated absorption of K more than T-N, P, Ca, Fe and Mn. On the other hand, rootzone temperatures in the range of 20oC to 25oC did not affect Mg contents. The lower uptake and supply toleaves of T-N, Fe and Mn at the high rot zone temperature promoted early tuberization and advancedhaulm senescence. The results stress the importance of keeping root zone temperature to as low as below 20,particularly in sumer under temperate zone.
Seed Potato (Solanum tuberosum) Production Using Plug Derived fromHydroponic Minitubers
장동칠,허온숙,박천수,김숭열 한국원예학회 2008 Horticulture, Environment, and Biotechnology Vol.49 No.5
The study was performed to investigate the possibility of seed potato (Solanum tuberosum L. cv Superior) production using plug derived from hydroponically produced minitubers of about 0.7 g. The minitubers were planted on 128-cells plug trays filled with growing media such as cocopeat, cocopeat/perlite (9:1 v/v), peatmoss, peatmoss/perlite (9:1), peatmoss/cocopeat (5:5) and three commercial potting media. Potato plug grown in the commercial growing media showed better growth in shoot and root compared to the peatmoss- and cocopeat-based growing media because of the optimum range of pH (4.8-5.8) and high levels of electrical conductivity (0.2-0.8 dS・m-1). The plugs were transplanted into the field under rain-sheltered screenhouse conditions. Transplanting of the plugs were compared with direct planting of minitubers and conventional cut seed tubers of about 30 g. Dry weight accumulation of shoots reached a maximum 70 days after planting (DAP) for cut tubers while those of plug and minitubers took 80 to 90 DAP. Tuber dry weight accumulation increased to 45-50 g per plant for cut tubers, 40-45 g for plug, and 35-40 g for minitubers when harvested 90 and 100 DAP. Specific gravity of tubers harvested showed significant increases between 80 and 90 DAP, particularly in the minitubers and plug. However, there were no significant differences among the seed tuber types although there were decreases in the cut tubers in 2004. Total number of seed tubers at harvest was not different between the plug and minituber plants. Tuber yield of plug (1.6-2.2 kg per 10 plants) was intermediate of the cut tubers (2.0-2.7 kg) and minituber plants (1.3-2.0 kg).
장동칠,허온숙,박천수,김성열 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.4
Despite the available reports on hydroponic potato production, little is known about its field establishment, yield components and efficiency of nitrogen (N) use from small hydroponic tubers (HT) planted in fields. Three sizes of HT (0.7 g,5 g, and 10 g) and conventional cut seed tubers (CT) of about 40 g of medium-early maturity cultivar ‘Superior’ were planted at the Highland Agriculture Research Center, Pyeongchang, Korea, on 20 May 2005 and 23 May 2006, and their field performances were compared. Increasing seed size resulted more emergence, faster shoot growth soon after emergence, higher N utilization efficiency (plant dry matter accumulation / plant N accumulation), higher tuber growth rate (TGR) and dry matter production, and higher fresh tuber yields. The first tuber formation and bulking were observed in CT plants followed by HT plants of 5 g and 10 g. The time to tuber formation and tuber bulking in 0.7 g HT plants was the longest and delayed by 6 or 8days compared to CT plants. Accumulation of tuber dry matter increased linearly from the period of tuber formation to near harvest. During the period, increasing seed size gave a significant increase in dry matter production in tubers. Tuber fresh yield of 0.7 g HT plants was 55% of that of CT plants, while those of larger HT (5 g and 10 g) plants were 75% and 80%,respectively. The results suggested the potential of using HT (5 to 10 g) for direct field planting.
장동칠,박천수,윤영호,이준구,정진철 한국생물환경조절학회 2004 시설원예연구 Vol.17 No.1
고랭지에서 9월에 수확한 여름재배산 씨감자를 겨울시설재배시 상품수량은 평균 19~39톤/㏊, 총수량 대비 51g 이상의 상품수량 비율은 82~92%이었다. 특히, ‘가원’, ‘남서’, ‘조풍’, ‘추백’, ‘조원’ 품종이 상품수량이 많고(23~43톤/ha) 총수량에 대한 상품수량의 비율도 높아서(88~94%) 소득성이 있었다. 또한, 괴경이 비교적 크고 편원형이며 육색이 백색~담황색일 뿐 아니라 괴경의 형성과 비대가 빨라 조기수확이 가능하였다. 이들 유망 품종의 괴경비중은 1.06~1.07로서 다른 품종보다 낮았다. 지역별로는 남원과 밀양지역의 겨울감자 생산성과 품질이 큰 차이가 없었으며 두 지역 모두 ‘가원’과 ‘남서’ 품종이 유망하였다. 두 품종 외에 남원은 ‘조풍’이, 밀양은 ‘추백’과 ‘조원’이 유망하였다.