• Proceedings of the Korean Society for Bio-Environment Control Conference
• /
• 2000.10b
• /
• pp.89-93
• /
• 2000

광파장 및 조사시기에 따른 오이묘의 생육 반응을 검토하였다. 광원에 따른 오이 묘의 생육상태를 조사해본 결과 청색광, 적색광을 처리한 것이 생체중, 하배축 무게, 근중이 증가하면서 하배축의 신장이 억제되었고, 청색광과 적색광을 혼합하여 야간 12시간씩 조사하여 30일간 육묘해 본 결과 뿌리의 발육도 우수하고, 줄기와 잎의 생육 정도에서도 우량묘의 소질을 보였다. 청색광과 적색광을 혼합하여 야간 6시간과 12시간씩을 조사하여 30일간 육묘한 결과 하배축의 길이는 각각 60.0mm와 44.9mm였고, 하배축의 무게는 0.59g, 0.62g으로 나타나 12시간 조사구가 하배축의 신장억제효과가 큰 것으로 나타났다. 하배축의 엽록소 함량은 청색광과 적색광의 조사시간이 길어질수록 뚜렷이 증가하였고, 식물체도 진한 녹색을 나타냈다. 광처리구와 무처리구의 오이묘 하배축의 횡단면과 종단면을 검경하여 세포구조를 비교해 본 결과 광처리구의 횡단면 표피조직은 단층의 밀착된 세포로 되어 있으며, 바깥쪽 세포는 현저하게 두꺼웠다. 후각조직의 세포는 작고 부정형이며, 세포간극이 조밀하였으며, 세포구조도 치밀한 특성을 보였다. 종단면은 광처리구에서 세포가 짧고 세포간에 간극이 없는 반면 무처리구는 세포가 길고 뚜렷이 구분되지 않은 것이 관찰되어 대체로 광처리구는 무처리구에 비해 세포신장이 억제되는 대신 세포구조가 치밀하여 식물체의 도장이 억제된다는 것을 알 수 있었다.

• Proceedings of the Korean Society for Bio-Environment Control Conference
• /
• 2001.04b
• /
• pp.95-99
• /
• 2001

플러그묘의 보급이 확산되어지면서 이의 효과적인 생산에 대한 인식이 높아지고 있다. 그러나 대량 생산을 위해 셀 수가 많은 트레이에 종자를 파종할 경우 시간의 경과에 따라 작물은 도장하게 된다는 점이 문제로 나타난다. 묘의 도장방지를 위해서는 개체간 충분한 공간을 두어 육묘하는 것이 좋지만 이 경우 생산비가 증가하게 된다. 이에 대한 공정육묘상의 생육조절방안으로는 상토내 수분ㆍ양분 조절, 주야간 온도차이(Lim등, 1997), 자외선 이용(Inamoto 등, 195), 생장조절제 이용(Gilbertz, 1992; Kacia, 1997) 방법 등이 보고되고 있다. (중략)

• Journal of Biosystems Engineering
• /
• v.23 no.3
• /
• pp.259-270
• /
• 1998

An automatic seedling transplanter, employed an innovative plug-seedling feeder was developed by improving the problems of conversational feeding and transplanting mechanisms. With conventional methods, missing and damage rates of seedling were high for long seedlings over 20cm and also breaking seed-bed was frequently observed. Thus, a pushout-bucket slide-hopper type trandsplanter was devised and tested. Test results of picking and transferring accuracies of the developed transplanter are as follows : A prototype transplanter performed with 1.5% of missing rate. The deviations of horizontal feed ranged from -0.3mm to 2.8mm and averaged 0.673mm for the 128-hoe test tray : and ranged from -lmm to ＋3mm and averaged 0.785mm for the 200-hole test tray. The deviations could decrease with precise manufacturing and lightening the mechanism. The maximum and deviations of vertical feed were -2.3mm and + 1mm, respectively, for the 128-hole test tray ; and were ＋3mm and ＋2.5mm, respectively, for the 200-hole test tray. The missing rate, seeding bruise rate and seed-bed damage rate were esitmate to be 1.3％, 0.4% and 3.5％, respectively, with the developed automatic transplanter.

• Journal of Bio-Environment Control
• /
• v.6 no.4
• /
• pp.258-263
• /
• 1997

The result was summarized of basic test and field test to find what quantity of irrigation, what state of compaction and what size of transplanting hopper could induce the optimum taking root in the transplantation of plug seedling by transplanters, and thus acquired the basic data for the development of the related transplanters and the optimum growth and development control. Livability of vegetables after transplanting had no significant difference with respect to for the size of hopper, but was greatly affected by the length of seedlings. The longest possible length of seedling for transplanting and optimal length were found to be 30cm and 28cm, respectively. For irrigation when transplanting red pepper or Chinese cabbage it was thought that large-sized hopper was appropriate. The livability of plug seedling 10 days after transplantation was mainly affected by soil moisture content. Consequently it was thought no irrigation would be needed when transplanting at the soil moisture content of more than 18% ; irrigation of more than 50cc would be needed at the soil moisture content of 13% : initial irrigation of more than 100cc and subsequent irrigation would be needed at the soil moisture content of less than 3.8%. The improvement of soil compaction method (left and right side compaction) with conventional semi-automatic transplanter was not necessary, since there was no difference in livability depending on the compaction methods, left-right side compaction or back-forth-left-right side compaction.

• Journal of Bio-Environment Control
• /
• v.6 no.1
• /
• pp.15-25
• /
• 1997

Plug seedlings of bell pepper(Capsicum annuum L.) were grown for 50 days in controlled environment chambers under 12 hrs per day photoperiodic condition with sixteen different day and night temperature regimes to investigate the possibility of height control. The seedlings were then transplanted to greenhouse to investigate the growth, flowering, and yield afterward. Plant height and stem length of seedlings were mainly affected by day temperature rather than night temperature. Internode elongation was suppressed by a negative DIF and was enhanced by a positive DIF even with the same average daily temperature (ADT). Leaf unfolding rate was influenced more by ADT than by DIF. Fresh and dry weights increased as ADT increased. Leaf area and stem diameter increased until temperature increased up to 24$^{\circ}C$ day and night temperature and decreased above 24$^{\circ}C$, The position at which the first flower was initiated was lowered as ADT increased. The first flower degeneration was not obvious up to 24$^{\circ}C$ ADT but increased rapidly above 24$^{\circ}C$ ADT. Seedling compactness(Dry weight per plant height :mg.mm$^{-1}$ ) was greater under -DIF than +DIF condition. In conclusion, DIF treatment was an applicable technique to control stem elongation and growth rate such as leaf unfolding rate and position at which first flower was initiated could be controlled by ADT.

• Journal of Bio-Environment Control
• /
• v.21 no.3
• /
• pp.199-206
• /
• 2012

This study was conducted in a glasshouse to examine the possibility of producing tomato plug seedlings in a newly-developed inert phenolic foam medium. Plug seedlings of 'Madison' tomato were grown in four pellet type media, Grodan rockwool, UR rockwool, phenolic foam LC, and phenolic foam LC-lite. Seed germination was checked for 7 days. Seedling growth was measured at 19 days after sowing. The greatest germination was obtained in the phenolic foam LC and phenolic foam LC-lite. Plant height, hypocotyl length, leaf area, dry weight, and fresh weight were significantly greater in the rockwool medium than those in the other media. However, the T/R ratio and stem diameter were the greatest in the phenolic foam LC than those in the other media. The total porosity and container capacity of the phenolic foam LC was higher than in the other media. The air space (%) was lowest in the phenolic foam LC. Overall, the phenolic foam LC and phenolic foam LC-lite produced seedlings with similar growth as the rockwool. These results suggested that both phenolic foam LC and phenolic foam LC-lite have potential to be used in production of plug seedlings of 'Madison' tomato.

• Journal of Bio-Environment Control
• /
• v.13 no.2
• /
• pp.81-89
• /
• 2004

This study was conducted in a commercial plug glasshouse in Sacheon to examine the possibility of producing tomato plug seedlings using various growing media containing cellular glass foam (CGF)and carbonized chestnut woodchips (CCW) as medium components. Plug seedlings of 'Seogun' tomato were grown in media containing 50% CCW＋50% peatmoss, 33% CGF＋67% peatmoss, and 50% peatmoss＋50% granular rockwool. A commercial plug medium (Tosilee) was used as the control. All seeds were sown in 200 cell plug trays on November 28, 2001. Seedling growth was measured at 31 days after sowing. Each treatment showed a similar growth result as compared to the control. Plant height, root grade, fresh weight, and air space and bulk density of the medium were significantly greater in the 33% CGF＋67% peatmoss treatment than those in the other media. However, growth was slightly suppressed in the 50% CCW＋50% peatmoss. pH and EC of the media were the highest in the control treatment, although no toxicity symptoms had been observed. The results suggest that perlite can be replaced with a new material such as CGF in the commercial scale production of plug seedlings of 'Seogun' tomato.

• Journal of Bio-Environment Control
• /
• v.16 no.1
• /
• pp.27-31
• /
• 2007

The experiment has investigated the effects of blending rate of waste rockwool in nursery media on growth of Marygold 'Yellow boy' plug seedlings. A commercial plug medium containing 10% zeolite, 10% vermiculite, 5% perlite, 10% peatmoss and 65% cocopeat was used as the control, and the other media compounded with 10% of zeolite, vermiculite, perlite and peatmoss and 10, 30, and 50% of waste rock-wool. There was not significant difference in germination rate ot Marygold between treatments. Plant height, number of leaves, stem diameter and leaf area were higher in commercial plug medium and compound nursery media containing 50% of waste rockwool than 30 or 10% of waste rockwool. Fresh weight and dry weight of shoot and root increased in the treatment of commercial plug medium and the medium of 50% waste rockwool than 10 and 30% of waste rockwool. These results suggested the possibility of utilization of waste rockwool for medium components of plug seedlings.

• Journal of Bio-Environment Control
• /
• v.12 no.3
• /
• pp.147-152
• /
• 2003

This study was conducted to analyze the energy balance in closed transplants production system (CTPS) for the production of high quality transplants. Potato (Solanum tuberosum L. cv. Dejima) plug seedlings were grown for 15 days at air temperature of 20$^{\circ}C$, relative humidity of 70%, photoperiod of 16/8 h, and photosynthetic photon flux (PPF) of 200 ${\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ following 5 days of tooting in CTPS. Electric energy consumption was 46% for lighting, 35% for cooling, 16% for heating, 2% for air circulation, and 1% for humidifying. The electric energy utilization efficiency and the short-wave energy utilization efficiency were 0.5% and 5.4%, respectively. These results suggest that CTPS has the feasibility for the commercial production of potato plug seedlings if the electric energy consumption in CTPS is reduced and the electric energy utilization efficiency is increased.

• Journal of Bio-Environment Control
• /
• v.15 no.4
• /
• pp.369-376
• /
• 2006

This research was conducted to evaluate the effect of root medium formulations on growth and nutrient uptake of hot pepper 'Knockgwang' in 72-cell plug trays. To achieve this, the nine root media were formulated by adjusting blending rate of perlite (PL) to coir (CO), peatmoss (PM) or coir+peatmoss (5:5, v/v, COPM). Then, the growth characteristics and tissue nutrient contents were determined at 35 and 70 days after sowing. The elevated blending rate of PL to CO increased fresh and dry weight of hot pepper at 35 days after sowing. The treatments of 20% in blending rate of PL to PM or that of 0% to COPM produced the highest fresh and dry weight among perlite treatments of PM or COPM. The results of crop growth at 70 days after sowing also showed similar trends to those of 35 days after sowing. The elevated blending rate of PL to CO or PM decreased tissue $P_2O_5$ and K contents and increased Ca and Mg contents at 35 days after sowing, With the equal blending rate of perlite, the plant tissue grown in CO had higher K contents and lower N, Ca and Mg contents than those in PM and COPM. The elevated blending rate of perlite in three organic matter also decreased tissue $P_2O_5$ and K contents at 70 days after sowing, but Ca and Mg contents were the highest in the treatment of 20% PL in CO, 40% PL in PM and 40% PL in COPM among perlite treatments in each organic matter.