• KOREAN JOURNAL OF CROP SCIENCE
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• v.38 no.6
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• pp.554-559
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• 1993

This experiment was carried out at Chuncheon substation, Crop Experiment Station to investigate the effect of cold water irrigation on the growth and grain yield of rice in 1990. Irrigation of cold water (17$^{\circ}C$) delayed 10 to 19 days of heading, and reduced about 17 to 31% of plant height in terms of culm and panicle length. Number of panicle per plant was decreased and / or increased by cold water irrigation. Cold water irrigation reduced spikelet number per panicle and percent of filled grain. Grain yield was increased but, straw weight was decreased according to water temperature gradient from inlet to outlet. There was varietal differences in head rice recovery by cold water treatment. In general the dark brown and / or black colored kernel increased at cold water inlet but decreased percent of green kernel. Alkali digestible value increased and amylose content decreased at cold water inlet.

• Asian Journal of Turfgrass Science
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• v.15 no.3
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• pp.127-136
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• 2001

A field trial was initiated to examine the range of inter- and intraspecific variations in morphological and phenological traits with five different accessions of smooth and large crabgrass. In addition, a controlled environment study was conducted to determine the phenotypic plasticity among the accessions of both species in response to 4 daily tempera-ture differentials. In the field experiment, significant inter- and intraspecific variations of smooth and large crabgrass were observed in morphological traits such as leaf length and width. However, most phenological traits were not substantially different between the species and among the accessions of each species. The first seedling emerged at the same time, requiring 9~ 10 days, regardless of the accessions and species. In a controlled environment study, all accessions of each species responded similarly to the 4 temperature differentials in seedling emergence, indicating seedling emergence was not a plastic trait. These results suggest that predicting crabgrass seedling emergence could be independent of geographical regions in the US.

• Microbiology and Biotechnology Letters
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• v.17 no.6
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• pp.606-610
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• 1989

For the purpose of improving glucoamylase productivity of Saccharomyces diastaticus, useful yeast in direct ethanol fermentation of starch, the effects of growth rate on the plasmid stability and glucoamylase productivity of S. diastaticus harboring recombinant plasmid pYES 18 containing glucoamylase gene STA 1 were investigated. In a selective medium, the recombinant plasmids were maintained stably at constant level but glucoamylase productivity was very low. On the other hand, in the complex medium containing starch, growth rate of the cell was stimulated by the supplementation of glucose and plasmid stability was improved by growth stimulation. We can conclude that glucoamylase productivity of S. diastaticus harboring the recombinant plasmid was increased as the maintaining of high plasmid stability in the cell.

• KSBB Journal
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• v.11 no.5
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• pp.543-549
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• 1996

Recombinant Saccharomyces cerevisiae BZ-pJ containing the gene coding for metallothionein, a metalbinding protein was grown in the medium with high cadmium concentrations to study the characteristics of growth and cadmium uptake. High concentrations of cadmium reduced cell growth and final cell density and increased the lag phase periods of the recombinant yeast. Addition of 10 mg $Cd^{2+}$/L to the growth medium remarkably decreased a lag period and enhanced the specific cadmium uptake to 52.6 mg $Cd^{2+}$/g dry cell. The effect of copper addition was further investigated in the medium of 680 mg Cd2+/L. An increase in copper concentration from 11.0 to 33.3 mg/L enhanced the specific cadmium uptake from 17.0 to 42.0 mg Cd2+/g dry cell.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.2
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• pp.121-129
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• 1987

Indonesian varieties were compared with Korean varieties on three different sowing times, each of which had three different nursery periods, at Suwon, Korea (126$^{\circ}$ 19'E and 37$^{\circ}$ 16'S). Indica-type varieties with exception of late-maturing ones had heading regardless of sowing time and nursery period. As the Korean varieties com-pared with those, the earlier sowing plots with shorter period of nursery gave better result in yields and yield components.

• Journal of The Korean Society of Grassland and Forage Science
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• v.7 no.2
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• pp.79-86
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• 1987

This study was carried out to investigate the relationships and the variations of agronomic characteristics in the shoot and root part of grasses for the basic data of the development, the management and the utilization of pasture in the forest. This study was conducted with 0% (full sunlight), 25%, 50% and 75% of shading degrees after orchardgrass, timothy, perennial ryegrass, ladino clover and orchardgrass dominated mixture were planted on Aug. 25 in 1984. The results are summarized as follows: 1. Dry matter yield in 25% of shading was increased 3-1 7% compared with 0% (full sunlight), while 50 and 75% of shading were decreased 28-35% and 44-60%, respectively. Dry matter yield of timothy, perennial ryegrass and ladino clover were decreased 10, 8 and 33%, respectively, compared with orchardgrass, but there was little difference between orchard grass and mixture. 2. Root distribution by different shading degrees was the maximum at 25%, followed by 0, 50 and 75% of shading degrees. Root distribution among different species was the maximum at orchardgrass, followed by perennial ryegrass and timothy. Especially, root distribution of timothy was very little compared with different species. And significantly positive correlation was observed in the relationship between root weight and dry matter yield (r=0.8 102**). 3. The physiological activity of root by different shading degrees was declined by more shading. 4. The length and the percentage of blade by different shading degrees was an increase tendency by more shading. The length and the percentage of blade among different species was followed by timothy, perennial ryegrass and orchardgrass, in that order. And the correlation between the percentage of blade and dry matter yield was significantly negative.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.42 no.6
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• pp.678-686
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• 1997

This experiment was carried out to develop the mass propagation system for producing plug plantlets using stem cuttings of virus-tree microtubers in potato. Cocopeat, vermiculite, perlite and peatmoss were combined and used as plug nursery media to find out the best combination suitable for the growth of seedlings derived from microtubers. Seedling growth was favored in high temperature (above 2$0^{\circ}C$) and a long-day photoperiod(above 16 hours) condition, while stolons and microtubers formed in outdoor condition. Shoot and root multiplication was not affected by NAA 10mg /1 or IAA 10mg /1 treatment. At the early growth stage of plug plantlets, the number of leaves and roots and the length of root increased significantly when nodes from the upper (near to apex) part of shoots rather than from basal part were taken. But after transplanting, these differences among these characters were not observed. At ninety days after transplanting the plug plantlets in spring time, plant was around 70 to 80cm in height, and the number of stolons and tubers were ten and seven, respectively.

• Korean Journal of Plant Resources
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• v.13 no.2
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• pp.124-130
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• 2000

In an effort to produce high quality Angelica gigas NAKAI in the southern area of Korea, a variety of mulching materials were used to prevent withering during the summer. The experimental results are summarized as follows. Soil water content and temperature under various mulching materials were higher than those without mulching, in all the cases studied. Among various mulching materials P. E.(polyethylene) mulching material showed the highest effect. The appearance of weeds was the lowest when using the black P. E. mulching, while growth of weeds was the greatest when using transparent mulching. Growth and development of the plant were better with P. E. mulching than straw mulching or no mulching, allowed for more and bigger leaves. The bolting rate was about 2∼5%, with a slightly larger value under P. E. mulching. Under P. E. mulching, probably due to good physical properties of the soil the number of roots was large, and the length and diameter were good. Active growth of roots under P. E. mulching resulted in a yield increase of the plant. The black P. E. mulching material showed a prominent effect on suppression of weed growth, and the black P. E. material was considered to be the most recommendable among various P. E. mulching materials when there is a lack of labor.

• Korean Journal of Plant Resources
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• v.23 no.2
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• pp.138-144
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• 2010

This study was carried out to examine used as fertilizer on growth and yield of Gastache rugosa. The medicinal herbs('Yeonryeonggobondan') remnant which have prescriptions of high frequency by Korean was analyzed. The medicinal herbs remnant have high content of nitrogen, phosphoric acid, potassium and organic. The growth of Agastache rugosa by application of medicinal herbs remnants were more effective than that of control. As the amount of fertilizers were increased, plant height, stem diameter, number of leaves and number of branches were increased. The growth was the highest in the treatment of 30~50 g/pot. Weight of whole plant of Agastache rugosa has a tendency to be heavy in application of medicinal herbs remnant than that of control.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.1
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• pp.92-96
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• 1987

A sweet corn hybrid. ‘Golden Elite 70’ was grown at four plant densities of 4.500, 5.500, 6,500 and 7,500 plants per 10 ares under early and ordinary season cultivations, respectively, to determine effects of plant density on growth and yield of sweet corn. Plant and ear heights and ear size were greater, and ear number per plant was less at ordinary season cultivation compared to early season cultivation. However. ear weight per 10 ares were similar between two cultural practices. There were no significant interactions between cultural practice and plant density for plant height, yield and yield components except ear length. Plant density did not affect silking date, and plant and ear heights and did not show consistent trend in ear size. Ear number per plant decreased with increasing plant density. Ear number and weight per 10 ares increased as plant density increased up to 6,500 plants per 10 ares and tended to decrease at 7,500 plants per 10 ares. The results indicate that the optimum plant density for sweet corn would be around 6,500 plants per 10 ares.