• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2003.04a
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• pp.140-145
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• 2003

폐쇄형 묘생산 시스템을에서 기내 배양된 감자 소식물체를 이용하여 플러그묘의 생산이 시도(Kim 등, 2002)된 이래 묘소질이 우수한 감자 플러그묘를 생산하기 위한 연구가 지속되고 있다(이 등, 2002, 2003). 묘소질은 정식 후 활착의 용이, 수량 증대 및 품질의 우수성을 제공하는 잠재력으로서, 초장, 절간장, 엽형, 엽색 등과 같은 외적 소질과 광합성속도, 엽록소함량, 근활력 등 내적 소질로 구분된다(Kim, 2002). (중략)

• Journal of Bio-Environment Control
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• v.10 no.1
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• pp.30-35
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• 2001

This experiment was undertaken to investigate the effect of root zone temperature during the night on absorption of mineral nutrients, growth, and fruit yield of the truss-limited hydroponic tomatoes in winter. The root zone temperature was either controlled to 10, 15, 20, $25^{\circ}C$, or left uncontrolled at ambient temperatures. Temperature of the covered beds rose as root zone temperature was raised, but it in all treatments was less than 3$^{\circ}C$ higher than that in the control. Raising root zone temperature, except $25^{\circ}C$, showed positive effect on plant height, leaf length, stem diameter, and plant fresh and dry weight, but not on T/R ratio which was the greatest in the control. Root activity in all treatments except $25^{\circ}C$ increased as compared to the control. Mean fruit weight, fruit count per plant, and fruit yield were the greatest in 2$0^{\circ}C$ treatment. Root zone temperature did not significantly affect the contents of total nitrate and magnesium in leaves, stems and roots. Concentrations of phosphate and calcium increased in leaves and stems, but decreased in roots as root zone temperature increased. Overall, 2$0^{\circ}C$ treatment gave the greatest growth and energy efficiency.

• Korean Journal of Environmental Agriculture
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• v.2 no.2
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• pp.103-107
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• 1983

The effect of photochemical oxidants on rice plants was measured by growing the rice plants Nihonbare in pot in charcoal-manganese oxide filtered atmosphere and non-filtered air. Visible injury on the leaf blades of rice plants were observed in plants grown under the unfiltered air chamber, but plants under filtered air chamber were free from any injury. Fresh weight of stem and root at maximum tillering stage in unfiltered chamber were 16.8 and 46.4% less than filtered air chamber, respectively. Grain yield in unfiltered air chamber was also reduced by 14.7% compared to that of filtered air chamber. And the reduced yield paralleled increase in concentration of oxidants in the atmosphere at the experimental site. ABA content in rice plants cultivated in unfiltered air chamber was higher than in filtered air chamber, but the root activity of rice plants in unfiltered air chamber was remarkably decreased.

• Korean Journal of Organic Agriculture
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• v.18 no.3
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• pp.377-386
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• 2010

Sweet persimmon, 'Fuyu', is the major cultivar for MA storage, but browning of blossom end part and fruit surface darkening occur during storage and decrease fruit qualities in fresh fruit market. Calcium (Ca) has a very important role in cell membrane and reduces Ca-related fruit disorder. Therefore, this study was conducted to investigate the effect of soluble Ca fertigation and foliar applications on soil chemical properties, root activity, and leaf nutrient status. Ca concentration in the soil was higher in both Ca fertigation (Ca-FG) and Ca+IBA fertigation (Ca+IBA) treatments than the other treatments, such as control (Cont), Ca foliar application (Ca-FA), and IBA fertigation (IBA). The increase in soil Ca improved soil pH. The Ca+IBA treatment increased root activity. Leaf Ca concentration was significantly increased by the CA-F A application, followed by Ca+IBA, and Ca-FG treatments.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.02a
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• pp.139-144
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• 2003

식물묘(transplant)는 육묘 후 포장에서 정식이 이루어지는 묘를 의미한다. 묘소질은 묘가 지녀야할 속성으로서 초장, 절간장, 엽색, 엽의 두께, 엽형, 괴근 형태 등은 묘의 외관과 관련된 묘소질에 해당하며, 광합성속도, 근활력, 엽록소 함량 등은 생리적 묘소질에 해당한다(Kim, 2002). 묘소질이 우수한 묘, 즉 외관이 우수하며, 병충해에 오염되지 않고, 생리 생태적 상태가 우수한 우량묘를 재배에 이용하면 정식 단계에서 활착 환경에 쉽게 적응하거나, 재배 과정에서 비료, 농약, 자재, 관리 노력 등을 적게 투입할지라도 수량이 증대되거나 품질 향상이 기대되므로 향후 우량묘에 대한 수요가 크게 증가할 것으로 예상된다(김과 박, 2002). (중략)

• Proceedings of the KSRS Conference
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• 2008.03a
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• pp.14-19
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• 2008

소나무 재선충에 감염되어 고사하는 소나무의 증가는 우리나라 산림에 심각한 위협이 되고 있다. 재선충은 매개 후 고사단계에 이르기까지 진행과 확산이 빨라 감염목이 발견되면 곧바로 임내에서 벌채 및 훈증 처리해야 하며 5${\sim}$6월에 감염되어 10${\sim}$11월에 육안으로 고사를 확인할 수 있다. 재선충에 의해 소나무가 고사되는 과정에서 식생활력도가 크게 감소하며 이러한 현상은 근적외선 영역에서 분광반사의 감소를 수반한다. 따라서 본 연구는 근적외선영역의 분광감소를 이용하여 재선충 피해목의 조기진단이 가능할 수 있다는 것에 착안하여 수행하였다. 근적외선영상 취득 방법으로 휴대가 간편한 근적외선 카메라를 이용하여 재선충 피해지역의 소나무림을 5월부터 11월까지 매월 촬영하였다. 이렇게 수집된 분광반사값으로부터 식생지수(Vegetation Index: VI)의 변화를 분석하였고, VI의 감소율로부터 소나무 재선충 감염목을 조기에 발견할 수 있다는 결과를 도출하였다.

• Korean Journal of Environmental Agriculture
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• v.16 no.1
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• pp.7-13
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• 1997

Tomatoes are flooded differently 0, 5, 10 and 15 ㎝, according to the developing stages such as transplanting stage under the condition of green house. Along with this, they are treated according to the time condition such as 6, 12, 24, 48 and 120 hours. The results obtained are summarized as follows. As the depth of flooding got deeper and the hours got longer, plant height, number of leaves, shoot and root decreased significantly. Flowering was possible for 24 hours in the flooding of 0 ㎝, for 6 hours in $5{\sim}10$ ㎝, but not possible after 6 hours in 15 ㎝. Without regard to the depth of flooding, adventitious root came into being before or after 48 hours of the treatment. Root activity diminished gradually as hours of treatment went by, but diminished rapidly over the depth of 5 ㎝. Chlorophyll content decreased similarly as in the case of root activity. Diffusion resistance of stomata cell increased as hours of treatment passed and depth increased. Photosynthesis and respiration diminished according as the hours and depth of treatment increased. Respiration diminished a little gradually but photosynthesis weakened greatly as the depth of treatment became greater and after 48 hours of treatment. Diseases occurred remarkably in proportion to the depth of treatment and the increase of hours. The possibility of preventing by means of insecticide treatment showed the same tendency as in the seedling stage. But its effect was not significant. After 120 hours yields could not be expected because tomatoes died without regard to the depth of flooding. Instead of the depth, numbers of fruits per plant decrease of individuals or variation of average weight of a fruit was recognized. Especially average weight increased in accordance with the increase of the depth. There was positive correlation between all the characters, such as plant height, number of leaves, fresh weight, chlorophyll content, root activity and yield traits, but negative correlation between these and epinastic curvature, diffusion resistance and adventitious root.

• Korean Journal of Soil Science and Fertilizer
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• v.18 no.1
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• pp.72-77
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• 1985

This study was performed to obtain some basic informations about the effects of irrigation water on the growth of rice plant. The water quality was surveyed at six pumping stations from the Nam river tributary to the downstream of Nakdong river, and sampling sites of soil and plant were five paddy fields near-by each station during rice growing periods in 1983. 1. Average value of COD was 5.1-7.1 ppm at 2 sites of the Nam river tributary, 11.4 ppm at 1 site of the midstream and 9.1-13.4 ppm at 3 sites of the downstream of Nakdong river. 2. The relationships between irrigation water and soil were $r=0.98^{**}$ for EC and $r=0.91^*$ for SAR, but the rest components did not. 3. Root activity of rice plant was low tendency as go by go the downstream of Nakdong river, and it was related to dry matter of rice plant ($r=0.62^{**}$), SAR ($r=-0.67^{**}$), and EC ($r=-0.62^{**}$) of soils.

• Korean Journal of Soil Science and Fertilizer
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• v.6 no.2
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• pp.115-127
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• 1973

Leaf discoloration of IR667 lines (tropical) and leading locals (temperate) in fields was classified according to the probable causes and nutritional disorder due to soil reduction in 1972 was investigated. 1. The causes of leaf discoloration in IR667 were low air temperature, soil reduction, seed born, insect bite, nitrogen depression, overdose pesticide, strong wind, early senescence and unknown one. 2. Leaf discoloration due to soil reduction which has been called Sageumbyeong by famers, was caused by the heavy application of $Ca(OH)_2$, compost and poor drainage followed by Zn and K deficiency and Fe toxicity. 3. About 30 days after transplanting deficiency concentration of K and Zn in leaf blade appears to be less than 2.0% and 20ppm respectively, and greater than 200ppm, 500ppm, and 1.0% respectively for toxicity or excess of Fe, Mn and Ca. and in the shoot 2.4% for K, 30ppm for Zn and 800ppm for Fe. The value of K/Ca should be greaterthan 2.0 for health. 4. When plants were damaged by soil reduction the contents of N, P, Ca, Mg, Fe, Mn, Na in shoot were increased and those of K, Zn, Si were decreased. 5. IR667 lines show in shoot higher content of N, P, Ca, Mg, Si, Na, and lower content K, Zn, Fe, Mn and lower root activity than local leading varietles in either healthy or disieased case, indicating IR667 lines are likely more suseptible to soil reduction damage. 6. Normal soil was less than 6.5 of pH and greater than -50 mv of Eh, but pH of problem soil was ranged from 6.7 to 7.4 and Eh from -100 to -190. 7. The root activity (${\alpha}$-naphthylamine oxidation) decreased at early stage of soil redudtion damage, then increased with severity and at the end it decreased again, but IR667 lines showed always lower root activity than local ones.

• Journal of Bio-Environment Control
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• v.12 no.2
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• pp.77-82
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• 2003

The effect of the particle size of perlite and irrigation amount on the growth, root activity and mineral competition of tomato was investigated in a recycling system. The particle sizes used were small (SPP, øl∼2 mm), medium (MPP, ø2∼3 mm), (LPP. ø4∼5 mm). Plant height, fresh weight and dry weight of tomato at the earlier growth stage were good at 3.0 L/day in MPP and LPP, but these were not significantly affected by irrigation amount in MPP, Fruit number, weight and yield increased at 1.5 L/day in SPP and 3.0 L/day at MPP or LPP, Deformed fruits tended to increase at higher irrigation amounts regardless of particle size. Root activity increased with increasing particle size with higher irrigation amount during early stage after transplanting, but remarkably decreased at 3.0 L/day in SPP as compared with the others at 100 days. Mineral contents of plants after harvest were higher at MPP and LPP than SPP, but were highest at 3.0 L/day in LPP. In conclusion, it was regarded that tomato growth in a recycling system was optimal at MPP or LPP with irrigation amount of B.0 L/day.