• Journal of Bio-Environment Control
• /
• v.19 no.2
• /
• pp.82-87
• /
• 2010

To investigate effects of kind of pot for raising of seedling (single plastic pot, double plastic pot, circular peat pot, square peat pot) and planting method of the pot (3/3, 2/3, and 1/3 by the buried degree of pot height) on watermelon (Citrullus lanatus) growth, this research was conducted under plastic film house. Since planting of seedlings, number, area and photosynthesis rate of leaves, plant height and weight were superior in seedling grown in double plastic pot than those grown in the others. In fruit characteristics harvested at 12 weeks after planting, fruit height, diameter and weight were longer in double plastic pot than in the others, also fruit peel thickness and hilum diameter were thicker and shorter. Initial growth of the plant after planting with seedling grown in double plastic pot was superior in method buried the 2/3 degree of the pot height than the other methods.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.40 no.1
• /
• pp.60-64
• /
• 2004

The reason of the loss for the plastic sea-eel pots were estimated as crew's mistake, strong current, bad weather, rough seabed, artificial reef and other boats' fishing. Especially, pot loss happened on the fishing could make some additional catch, loss of the catches and ghost fishing because there are baits and alive fish in the lost pot. Quantity of the lost pots was estimated as 2~4 times of the ordinary usage. On the result of investigation to analyze the possibility of sustainable ghost fishing for the lost pot to feed the fishes at anytime because there were blenny, silver whiting, bar-tailed flathead and shrimp including sea-eel in the lost pot. In the bioeconomic point, ghost fishing is competitive with the general fishing. Accordingly, usage of biodegradable plastic material for the plastic sea-eel pot will be better to reduce ghost fishing

• Applied Biological Chemistry
• /
• v.44 no.4
• /
• pp.230-234
• /
• 2001

Traditional doenjang was fermented in different vessels, and its quality characteristics were investigated during ripening. Fermentation vessels used were dark brown glaze pot, dark brown glaze pot with glass lid and plastic box. Water content of doenjang decreased during fermentation, with doenjang pepared in dark brown glaze pot with glass lid showed the highest water content reduction. Water-soluble nitrogen content $(4.56{\sim}5.80%)$ was the highest at 8 months fermentation and amino type nitrogen content continuously increased until 12 months, with doenjang in dark brown glaze pot higher than those in plastic box. Sensory evaluation revealed the quality of doenjang fermented in plastic box was significantly lower than others after 4 months.

• Journal of Environmental Science International
• /
• v.24 no.8
• /
• pp.1037-1043
• /
• 2015

Since single-use disposable plastic usage has steadily been increasing, recent trends in polymeric research point to increasing demand for eco-friend materials which reduce plastic waste. A huge amount of non-degradable polypropylene (PP)-based pots for seedling culture are discarded for transplantation. The purpose of this study is to investigate an eco-friendly biodegradable material as a possible substitute for PP pot. The blend of poly(lactic acid) (PLA) with poly(butylene adipate-co-terephthalate) (PBAT) was used because of its good mechanical and flexible properties as well as biodegradation. After landfill, various properties of the blend pot were investigated by UTM, SEM, NMR and TGA. The results showed the tensile strength of the blend film rapidly decreased after 5 weeks of landfill due to degradation. From NMR data after landfill, the composition of PLA in the blend was decreased. These results indicate that the biodegradation of the blend preferentially occurs in PLA component. To investigate the effect of holes in pot bottom and side on root growth, a plant in the pot was grown. Some roots came out through holes as landfill period increases. These results indicate that the eco-friendly pot can be directly planted without the removal of pot.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.20 no.4
• /
• pp.341-347
• /
• 1987

The behavior of conger eel, Astroconger myriaster (Brevoort), to the bamboo and plastic pots with baits was investigated alternately in two experimental water tanks. One of the pots being dropped on the tank bottom, the eels touched it to obtain the bait probably by their sense of smell, and increased rapidly in the number of touch to show a maximum within 30 minutes. But the touch was made mainly to the pot wall at which the bait was located and quite accidentally to the pot mouth. The eels touched the pot mouth retreated frequently without attempting to enter the pot and their entering was very hampered by the bamboo funnel constituting the pot mouth. However, a entering, if made, encouraged other touches and the touches ascribed other enterings. But, if 30 minutes elapsed, the number of touch decreased gradually and so the enterings were little made. The ability of pots attracting the eels into them was varied with their inclination to the tank bottom and the bait position in them. That is, the pot which was laid horizontally showed high ability of attracting in case in which the bait was fixed in the vicinity of its mouth. The pot, inclined by $30^{\circ}$ by lifting its tail and had a bait left free, showed almost equal ability to the horizontal pot with a bait in the vicinity of mouth. But the pot, inclined by $30^{\circ}$ by lifting its mouth and had a bait left free, showed a very low attracting. A comparison between the bamboo and plastic pots gave only that the entering of the eels became later several minutes in the latter.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.38 no.2
• /
• pp.149-155
• /
• 2002

Sea-eels caught by fishing boat and trawl were analyzed to investigate feeding status and individual growth of sea-eels caught from the lost plastic sea-eel Pot which is estimated at the ghost fishing Average length of sea-eel caught from fishing boat and test fishing was 33.6cm, 48.9cm for trawl and 45.6cm for the lost plastic sea-eel pot, respectively. The length frequency distribution is the same as the fact that sea-eel goes to the offshore from the coastal waters according to the getting growth. Sea-eel rate having empty stomach were 5.0% for fishing boat, 4.2% for trawl and the empty stomach rate of sea-eel was the highest as 87.6% in the lost pot. Sea-eel rate feeding fish as prey were 98.7% for fishing boat, 78.8% for trawl and 63.3% for the lost pot, respectively and other preys were crustacean and cephalopod. Fatness index calculated using weight and length were 1.514 for trawl catches and 1.292 for the lost pot and the difference was 15% between trawl catches and the lost pot. There also was difference at the 5% significance level in the result of t-test of Covariance Analysis.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.42 no.1
• /
• pp.1-10
• /
• 2006

Present study was conducted to improve the spring frame net trap for conger eel, Conger myriaster which prevents by-catch and protects immature fish. A series of comparative fishing experiment was carried out in water off the south-east coast of Korea from Nov. 2004 to Jul. 2005. And analyzed the amount of catch, by-catch rate, and CPUE, etc. of experimental traps which were the spring frame net traps, sorted four types of flappers. And the compared gear was a plastic conger eel pot. The conclusions were as follows. By-catch rates of spring frame net trap with the compressed flapper bound by nylon mono-filament was about 0-3%. CPUE of spring frame net trap with the compressed flapper was about 50-60% lower than that of traditional and plastic pot. And in case of conger eel that the total length is over 350mm, CPUE was little different on each type of flapper of every mesh size.

• Food Science and Biotechnology
• /
• v.18 no.1
• /
• pp.48-52
• /
• 2009

Eoyukjang is a traditional Korean sauce made of cooked soypaste or meju supplemented with fish and meats at least 1 year of fermentation period. Eoyukjang was recovered according to the traditional method and stored under the ground in a pot without plastic packaging (13G: 13 month fermentation under the ground) or in an incubator wrapped with plastic packaging (6I, 12I, and 18I: 6, 12, and 18 month fermentation, respectively). Distribution of isoflavones and fatty acids were monitored by high performance liquid chromatography (HPLC) and gas chromatography (GC), respectively. Total isoflavones in 13G, 6I, 12I, and 18I were 3.792, 0.387, 0.460, and $0.510{\mu}mol/g$, respectively. Samples of 13G had at least 8.24 times higher isoflavone contents than samples from 12I. Aglycones were the major isoflavones in eoyukjang and were found more than 92% in 13G and 39-63% in incubated samples. In fatty acid analysis, the ratios of unsaturated to saturated fatty acids from 13G were higher than those from 6I, 12I, and 18I. Traditional fermentation methods using a pot may allow more migration of air and moisture than samples wrapped with plastic packaging, which caused the difference in the distribution of isoflavones and fatty acids.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.23 no.4
• /
• pp.315-322
• /
• 1990

In order to find out the most favorable shape and structure of pot for conger eel, Astroconger myriaster(Brevoort), the box type, tube type and flat box type of net pots and the pipe type of plastic pot were prepared. Then, the ability of the pots attracting the eel into them were investigated through a tank experiment. The attracting ability was highest in the pipe type without distinction of its length, 50cm and 60cm. In the flat box type, the effective height of pot and the diameter of entrance tip turned out 5cm respectively. But the ability was very poor in the rest pots, especially in the tube type. Thus, the pipe type and flat box type of pots were employed again in a field experiment for comparing their catches with those of the conventional bamboo and plastic pots. In the experiment, the catches were the most in the pipe type and second in the flat box type. But the bamboo and plastic pots both produced comparatively low catches, showing no significant difference between them. It was therefore concluded that the pipe type of pot might be the most favorable one for catching the conger eel.

• Korean Journal of Agricultural Science
• /
• v.25 no.2
• /
• pp.160-167
• /
• 1998

This study was carried out to estimate the effect of NPK fertilization on tree seedling growth and chemical properties of soil. Seedlings of Betula platyphylla var. japonica and Fraxinus rhynchophylla were planted in May 1998 in the nursery at Gariwang mountain, Kangwondo, and seven NPK fertilizer plots(4, 12, 28, 60, 124, 252, and $508g/m^2$) and one non-fertilized plot were used to meet the study objectives. Seedlings of Pinus koraiensis and Acer mono were planted in April 1998 in plastic pots of nursery at Chungnam National University, and seven NPK fertilizer plots(0.5, 1.5, 3.5, 7.5, 15.5, 33.5 and 63.5g) and one non-fertilized plot were used to meet the study objectives. To estimate the relative growth ratios of the seedlings, height and root collar diameter of the seedlings were measured after planting and also in October 1998. Soil samples were collected in October 1998 from the nursery of Gariwang mountain and the plastic pot of the nursery of Chungnam National University. The relative growth ratios of height and root collar diameter in Betula platyphylla var. japonica, Fraxinus rhynchophylla and Acer mono were greater in all fertilized plot than non-fertilized plot, but there was no difference in relative growth ratio of height and root collar diameter of Pinus koraiensis between the fertilized and non-fertilized plots. NPK fertilization increased soil P and K, decreased exchangeable Ca and Mg, and base saturation, and pH. Fertilization resulted in no difference in total soil N between the fertilized and non-fertilized plots of nursery of Gariwang mountain, but increased in total soil N in plastic pots. Fertilization increased the growth of hardwood species and had changed soil chemical properties of this fertilizer trials.