• Korean Journal of Environmental Agriculture
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• v.7 no.2
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• pp.146-152
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• 1988

In order to examine the seasonal variation of organic and inorganic nitrogen compounds, nitrogen compounds in compost were determined at various composting periods. Total nitrogen, organic nitrogen and biodegradable nitrogen contents in compost were almost not changed, while nonbiodegradable nitrogen contents were increased a little with the lapse of composting time. But effective contents of total nitrogen, organic nitrogen and biodegradable nitrogen were decreased with the progress of composting, while effective contents of nonbiodegradable nitrogen were not changed during composting. Ammonium nitrogen contents in compost were highest at the start of composting, and then the contents were decreased with the lapse of composting time. But after turning the contents were increased again, and thereafter the contents were decreased with the progress of composting. Nitrate contents showed a tendency adverse to ammonium nitrogen contents. Organic nitrogens in organic matter in compost were increased slowly within 9 weeks after composting, and thereafter the contents were increased rapidly to 21 weeks after composting. Total nitrogen contents determined by $F{\"{o}}rster$ Method were higher than those determined by Kjeldahl Method. Total nitrogen contents determined by Kjeldahl Method were 6% higher than biodegradable nitrogen contents determined by $F{\"{o}}rster$ Method. Loss of nitrogen in compost was highest at early periods of composting and its losses determined by Kjeldahl Method and $F{\"{o}}rster$ Method in 30 weeks after composting were 50% and 48% of total nitrogen, respectively. Highly positive correlations were observed among total nitrogen determined by Kjeldahl Method, biodegradable nitrogen determined by Kjeldahl Method, total nitrogen determined by $F{\"{o}}rster$ Method and biodegradable nitrogen determined by $F{\"{o}}rster$ Method one another.

• Journal of the Korean Society of Tobacco Science
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• v.9 no.1
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• pp.19-26
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• 1987

KA 101 and Xanthi-Basma were cultivated in Korea and Greece to compare the respective responses to environments on their leaf composition during 1984 and 1985. Cured leaves cultivated in Greece had brighter and greenish color with 2-4 times higher total chlorophyll and carotenoids showing higher contents of total nitrogen, nicotine, petroleum ether extract, volatile acids and neutrals, but crude ash and pH of leaves at top stalk position were lower than in Korean cultured leaves. Xanthi-Basma showed higher contents of nicotine and total nitrogen, but lower contents of reducing sugar than KA 101. There were no difference in crude ash, petroleum ether extract contents and pH of leaves. Among stalk positions, the upper stalk leaves in Greece had higher contents of total nitrogen, protein nitrogen, nicotine, petroleum ether extract and volatile acids but lower contents of reducing sugar than lower ones., whereas the supper stalk leaves in Korea had much higher contents of total nitrogen, protein nitrogen, pH, crude ash, but not higher contents of petroleum ether extract and volatile acid contents than lower stalk position. It suggest that in chemical criteria the better quality leaves are on the upper stalk position in Greece but not the same in Korea probably due to the rainy weather conditions during the later growth stage in Korea.

• Journal of Environmental Science International
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• v.18 no.7
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• pp.811-817
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• 2009

To determine changes in nitrogen contents and optimal rates as N fertilizer, we investigated nitrogen characteristics in the slurry in the respond to the application of 0, 0.5, and 1 g of ferrous sulfate or alum /25g of dairy slurry. Additions of ferrous sulfate or alum increase total nitrogen, inorganic nitrogen, available nitrogen, and predicted available nitrogen contents in dairy slurry, resulting in reduction in pH. The best results were found in the treatment with 0.5 g of ferrous sulfate or alum /25 g of dairy slurry. In conclusion, the use of ferrous sulfate or alum as on-farm amendment to dairy slurry should be represented an alternative to improve N in dairy slurry.

• Journal of the Korean Society for Heat Treatment
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• v.19 no.2
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• pp.83-89
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• 2006

The surface phase changes, the hardness variations, the nitrogen contents and the corrosion resistances of 17-4 PH stainless steel have been investigated after nitrogen permeation(solution nitriding) at a temperature ranges from $1050^{\circ}C$ to $1150^{\circ}C$ The phases appeared at the nitrogen-permeated surface layer were shown to martensite plus austenite and austenite, depending on the variation of nitrogen and chromium contents. And the surface hardness was also depended on the phases appeared at the surface layer from 370 Hv to 220 Hv. The precipitates exhibited at the nitrogen-permeated surface layer were niobium nitride, niobium chromium nitride and carbo-nitride in the austenite and martensite matrices. The surface nitrogen contents were followed by the Cr contents of the surface layers, representing 0.55% at the temperatures of $1050^{\circ}C$ and $1150^{\circ}C$ respectively, and 0.96% at $1100^{\circ}C$ at the distances of $60{\mu}m$ from the outmost surface. From the comparison of the corrosion resistances between nitrogen-permeated and solution-annealed steels, nitrogen permeation remarkably improved the corrosion resistance in the solution of 1 N $H_2SO_4$ due to the increase of nitrogen content in the surface austenite phase.

• Korean Journal of Materials Research
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• v.24 no.2
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• pp.81-86
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• 2014

The nitrogen solubility and nitride capacity of $CaO-SiO_2-Al_2O_3-MgO-CaF_2$ slag systems were measured by using gas-liquid equilibration at 1773K. The nitrogen solubility of this slag system decreased with increasing CO partial pressure, with the linear relationship between nitrogen contents and oxygen partial pressure being -3/4. This system was expected to show two types of nitride solution behavior. First, the nitrogen solubility decreased to a minimum value and then increased with the increase of CaO contents. These mechanisms were explained by considering that nitrogen can dissolve into slags as "free nitride" at high basicities and as "incorporated nitride" within the network at low basicities. Also, the basicity of slag and nitride capacity were explained by using optical basicity. The nitrogen contents exhibited temperature dependence, showing an increase in nitrogen contents with increasing temperature.

• Journal of Nutrition and Health
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• v.6 no.3
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• pp.9-15
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• 1973

Some effect on the protein metabolism in growing albino rats by feeding on the rice mixed with wheat or barley have been studied. The species of wheat and barley used in this experiment were either 80% polished or nonpolished wheat, barley and naked barley. The growing rats to be examined were fed on 30% wheat or barley mixed with rice diets for 8 weeks. The total nitrogen, creatinine, amino acid nitrogen and urea-nitrogen contents in the liver and the creatinine and urea-nitrogen contents in the urine have been measured. The results obtained are summarized as follows: 1. The total nitrogen contents in the liver and the serum were no remarkable difference by feeding on each mixed diet, compared with the rice diet group. 2. The creatinine contents in the liver of the unpolished wheat and barley mixed diet groups were the similar to that of the rice diet group, but these were higher by feeding on the polished wheat and barley mixed with rice diets. 3. The amino acid nitrogen contents in the liver of the polished naked barley mixed with rice diet groups were the similar to that of the rice diet group, but these were higher by feeding on the other mixed diets than the rice diet. 4. The urea-nitrogen contents in the serum of the polished wheat and naked barley mixed with rice diet groups were higher than that of the rice diet group, but these were significantly lower by feeding on the polished barley mixed with rice diets than the others. 5. The creatinine and the urea-nitrogen contents in the urine of the original wheat and barley mixed with rice diet groups were higher than that of the polished wheat and barley mixed with rice diet groups. In the view of the above results, it could be seen that the protein metabolism was remarkable change according to polish of the wheat and barley.

• Korean Journal of Environmental Biology
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• v.24 no.2 s.62
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• pp.186-194
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• 2006

Nitrogen dynamics of Seagrass Zostera marina were investigated in both Dongdae Bay and Ojiri from March to August, 2004. All seagrass samples were separated into four fractions such as leaves (new and adult), sheath and rhizome in order to understand temporal variations of nitrogen content in different fractions of Zostera marina. There are temporal variations of shoot production rates and total nitrogen contents in their different fractions at both study areas. Leaf production were almost 4 to 5 fold higher in summer than in winter. The irradiance is the primary factor controlling the leaf production of Zostera marina in both sites although water temperature also influence its productivity. Nitrogen contents of leaves were overall low in summer than in winter, but nitrogen content of rhizome increased during the summer season. In addition, nitrogen contents of new leaves were mostly higher than adult leaves in spite of lower nitrogen content of new and adult leaves in high productivity period. This result suggests that Zostera marina seems to have significant translocation ability of nitrogen in a shoot. The nitrogen content of leaf tissue may reflect nutritional nitrogen availability.

• Journal of the Korean Society of Tobacco Science
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• v.1 no.2
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• pp.120-126
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• 1979

The nitrogen contents of some forms in Burley tobacco leaf cultivated in Yaesan, Mokpo and Namwon district were investigated. The rate of each form in total nitrogen contents were as follows ; Protein form nitrogen 30~33 % Nitrate form nitrogen 10~123% Alkaloid form nitrogen 8~16 % Ammonia form nitrogen 6~9% Amide form nitrogen 2~ 3% Other form nitrogen 26~44 % The order of nitrate form nitrogen content on the nitrogen of each tobacco cultivated in three area was Yaesan > Namwon > Mokpo, but that of alkaloid form nitrogen was reverse order of nitrate form nitrogen. As for Quality ( grade ), the orders of alkaloid and ammonia form nitrogen content on total nitrogen were H5> 3> 1> L 1> 3> 5, but that of nitrate form nitrogen was reversed.

• Korean Journal of Soil Science and Fertilizer
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• v.49 no.6
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• pp.677-681
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• 2016

Excessive nitrogen fertilization influences crop yields and quality as well as environmental pollution. In this study, yields, nitrogen use efficiency and free sugar contents of burdock (Arctium lappa L.) were evaluated at different levels of nitrogen fertilization. Nitrogen fertilizer was applied at 5 levels (0, 50, 100, 150, 200%) based on the conventional fertilization ($N=230kg\;ha^{-1}$), and phosphate and potassium fertilizer were treated by conventional P and K fertilization ($P_2O_5-K_2O=140-210kg\;ha^{-1}$) in all plots. The root yields of burdock were the highest in N 100~150% treatment plots. Nitrogen use efficiency and nitrogen recovery decreased from over N 150% treatment. Nitrogen uptake of root was greater than that of shoot in N 50~200% treatments. Fructose contents in root were inversely proportional to the level of nitrogen fertilization. As considering nitrogen recovery and root quality, economical burdock yield was obtained in N $230kg\;ha^{-1}$.

• Journal of Plant Biology
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• v.16 no.1_2
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• pp.30-38
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• 1973

To study the response to plant growth by the environmental factors, the effects of application of nitrogen on changes in the yield, crude protein, amino acids, chlorophyll, carotene, total phosphorus, acid-soluble phosphorus, phospholipids, RNA, and DNA were investigated with westerworlds 9Lolium sublatum) and perennial rye-grasses (Lolium perenne). The amounts of dry weight, crude protein, amino acids, chlorophyll, carotene, total phosphorus, acid-soluble phosphorus, phospholipids, RNA and DNA of both rye-grasses increased with adequately increasing nitrogen, and reached a maximum with an adequate application of nitrogen. The relationships between yields and crude protein contents, crude protein and RNA contents, and yields and RNA contents of westerworlds and perennial rye-grasses were found to be positively correlated, respectively. Therefore, in general, the response to plant growth by the environmental factors such as nitrogen nutrient may be summarized as follows: Environmental factors\longrightarrowDNA\longrightarrowRNA\longrightarrowProtein\longrightarrowPlant growth