• Korean Journal of Environmental Agriculture
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• v.18 no.2
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• pp.122-125
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• 1999

The water quality of the Keum river was surveyed at 4 sites from April to September in 1995 and 1997. Average values of inorganic contents analyzed in 1997 were pH 7.2, EC 0.18dS/m, $NH_4-N$ 0.60mg/l, $K^+$ 4.12mg/l, $Ca^{2+}$ 12.12 mg/l, $Mg^{2+}$ 2.75mg/l, $Na^+$ 15.1mg/l, $NO_3-N$ 1.97mg/l, $PO_4^{3-}$ 0.15mg/l, $PO_4^-$ 18.9mg/l, $Cl^-$ 21.8mg/l, Fe 0.22mg/l, COD 19.7mg/l. On the basis of these values, it was suitable for the irrigation source. Water pH of the Keum river ranged from 6.7 to 8.0. EC of the Daecheong-dam was maintained below 0.13dS/m, but those of the middle and lower stream were ranged from 0.13dS/m to 0.32dS/m. Monthly average values of all the ration contents were the highest in April and were decreased thereafter. And it was slightly increased in September. However $NO_3-N$, $SO_4^{2-}$ contents were higher in June than any other months. All the inorganic contents were the highest at Taepyeong-ri, Yeongi-gun due to sewage water and livestock wastes. The inorganic contents were negatively correlated with precipitation, generally.

• Korean Journal of Food Science and Technology
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• v.26 no.3
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• pp.283-287
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• 1994

The effects of packaging methods on the storage properities of salted Chinese cabbage were examinined during 3-week storage. The weights of salted Chinese cabbage decreased to 69-77% by water loss and salinities decreased from 2.6% to 2.0%, respectively. The pH decreased from 6.4 to 6.2 for 1- week storage in all cases, but the pH increased to 6.6 in non packaging(Non-P), maintained at 6.2 in PVC container packaging(PVC), and decreased continuously to 5.5 and 5.7 in LDPE packaging (LDPE) and HDPE packaging(HDPE), repectively for 3-week storage. Reducing sugars increased slightly for 1-week storage for the relative concentration effect by water loss, but decreased to 1.8% for 3-week storage because of the microbial fermentation. Cutting force increased in LDPE for the continuous osmosis phenomena but decreased in Non-P for the putrefaction. As the results, LDPE was found to be the most effective packaging method.