• Korean journal of applied entomology
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• v.4
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• pp.25-28
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• 1965

The study was carried on a new disease of rice seedling which named 'Black rot of rice seedling'. None of papers on this disease was reported recently. The symptom of this disease was quite different from other seedling rot of rice plant. Submerged mycelial growth in water was black colored and it was surrounded whole surface of seed. Soil on which diseased seedlings were placed was black colored by this disease and the seedlings, finally stopped to grow within 3 em in height, and appeared with black rot symptom. Sporulation of the pathogen does not occurred under both of natural and artificial conditions. The mycelium appeared in dark color and with distinguished septation under the microscope. With those results it is easily recognized that the pathogen does not belong to those which causal organism:; of other seedling rot of rice plant like as Phycomycetes or Fusarium species. The study should be continued on identification of the causal organism. Favorable environments for the disease did not differ from other seedling rot of rice plant, and varietal resistance also did not significantly differ among the varieties used in this experiment. Dissemination of the disease was carried out not by planted seeds but by infected soil.

• Journal of the Korean Society of Tobacco Science
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• v.14 no.2
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• pp.126-132
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• 1992

This experiment was conducted to examine estimates of heterosis, degree of dominance, heritability and phenotypic and genotypic correlation for several mutant characters in flue-cured tobacco variety. Significant heterosis was noted, recording 2.73 and 6.16% for leaf width, -6.86 and -4.72 for leaf shape index, 19.8 and 23.4% for bacterial wilt disease index in Fl an4 F2 generation, respectively, and -1.44 for days to flower in F2 generation. And also leaf width was appeared partial dominance in Fl, and leaf shape index in Fl and F2, Leaf width in F2 was appeared overdominance. Estimated heritabilities in the broad sense ranged from 0.77 to 0.87 for plant and stalk height and days to flower, while those of leaf number, leaf length and width, leaf shape index and bacterial wilt disease index ranged from 0.50 to 0.65. And the heritabilities in the narrow sense were appeared 0.64 and 0.72 for stalk and plant height, respectively, and the others were ranged from 0.32 to 0.47 Positive genotpic correlations appeared among plant height, stalk height, leaf length and leaf width, and between leaf shape index ands day to flower. And negative genotypic correlations appeared between leaf shape index and plant height and stalk height and leaf width, and between bacterial wilt disease index and leaf length.

• Korean Journal of Soil Science and Fertilizer
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• v.4 no.2
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• pp.161-166
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• 1971

1. Increment of applied $SiO_2$, N and K effected Significantly the rice yield in Akiochi soil. Nitrogen fertilizer, however, should be split in several times. 2. The applied silica accelerated the nitrogen efficiency in particular when the increased nitrogen fertilizer was applied. 3. The number of hill per plant was increased by increasing nitrogen application, while percent of maturity was decreased. But application of increased Potassium gave remarkerbly high percentage of maturity. 4. Application of silica to the Akiochi soil increased both the number of spikelets and percentage of maturity of rice. 5. The increased application of nitrogen raised nitrogen content in plant but decreased the content of silica and potassium. The ratio of $SiO_2/N$ and $K_2O/N$, therefore, decreased. 6. From the results it can be concluded that application of increased nitrogen to the Akiochi soil should be accompanied by application of increased $SiO_2$ and K.

• Journal of Bio-Environment Control
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• v.10 no.4
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• pp.219-224
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• 2001

This experiment was conducted to evaluate net mineralization and nitrification in rain shelter soil incorporated with wine sludge. Net mineralization and nitrification rates varied among treatments during pepper growing periods. In general, net mineralization increased up to 90 days after transplanting before its decrease during the rest growing periods. Maximum net mineralization and nitrification in upper 0-15 cm layer soil were observed in T4 at 90 days after transplanting. The greatest amount of mineralization in upper layer soil was 272.5 mg.kg$^{-1}$ at 30 days in the control and 843.3 mg.kg$^{-1}$ at 90 days after transplanting in T4. Overall, both net mineralization and net nitrification were greater in the upper layer soil than in the lower 15-30 cm layer soil.

• Journal of Korea Water Resources Association
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• v.33 no.1
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• pp.61-72
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• 2000

The purpose of this study is to improve the method of evaluating groundwater recharge by using grid-based soil moisture routing technique. A model which predicts temporal variation and spatial distribution of soil moisture on a daily time step was developed. The model uses ASCII-formatted map data supported by the irregular gridded map of the GRASS(Geographic Resources Analysis Support System)-GIS and can generate daily and monthly spatial distribution map of surface runoff, soil moisture content, evapotranspiration within the watershed. The model was applied to Ipyunggyo watershed($75.6\;\textrm{km}^2$) located in the upstream of Bocheongchun watershed. Seven maps; DEM(Digital Elevation Mode]), stream, flow path, soil, land use, Thiessen network and free groundwater level, were used for input data. Predicted streamflows resulting from two years (l995, 1996) daily data were compared with the observed values at the watershed outlet. The results of temporal variations and spatial distributions of soil moisture are presented by using GRASS GIS. As a final result, the monthly predicted groundwater recharge was presented.sented.

• Journal of Korean Society of Forest Science
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• v.62 no.1
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• pp.68-75
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• 1983

Some morphological and anatomical characteristics of four Abies species in Korea were investigated to find the characteristics and the taxonomical relationship between the species. The results were summarized as follows: There was no significant difference in needle thickness and number of hypodermic cell layer among 18 morphological and anatomical characteristics of cone and needle between the species. A. koreana and A. nephrolepis were similar in above fourteen characters and A. holophylla and A. firma were also similar in the 14 characters. A. koreana and A. firma showed similarity in above two characters. Main resin canals of needles in A. koreana and A. nephrolepis were situated in leaf margin (L-LM), those of A. holophylla, in L, L-M and M, and that of A. firma fully in other locations except L.

• Journal of the Korean Society of Food Culture
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• v.18 no.6
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• pp.544-550
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• 2003

This study was designed to investigate the effects of Korean 1% Shanshuyu extract in Pb administered rats. Forty male Sprague-Dawley rats weighed 100 l0g were used for this experiment and divided into following 4 groups; Con(control group), Shan(1% Shanshuyu extract), Pb(1,000ppm alone lead administered group), Pb-Shan(1,000ppm alone lead administered group with 1% Shanshuyu extract group). Food intake weight and FER(Food efficiency ratio) were remarkably decreased in lead added group. Tissue weight of liver, lung, stomach, heart, kidney and spleen of lead exposed rats were reduced by 1% Shanshuyu extract group. The lead content in the rats tissue of lead alone administered group was lower than in the rats tissue of lead administered group with 1% Shanshuyu extract group. AST(Asparatate transferase) and ALT(Alanine transferase) were increased in lead-administered group and lower in the 1% Shanshuyu extract group. These results suggested that 1% Shanshuyu extract may have some protective effects from of tissue demage induce with Lead.

• Journal of the Korean Society of Tobacco Science
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• v.15 no.1
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• pp.34-48
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• 1993

This experiment were conducted to investigate heterosis and combining ability for several mutant characters by analyzing dialled crosses of flue-cured tobacco. In a dialled cross of 3 flue-cured varieties and the mutant line 83H -5, the heterosis was somewhat higher in Fl than in F2. For growth character, the heterosis was 0.28-6.03% in plant height, leaf number, leaf shape index and yield, and was 43.2% for bacterial wilt disease index. The mutant line 83H-5 showed significantly negative GCA effect for plant height, leaf width and bacterial wilt disease index in Fl and F2, leaf length in F2, and positive GCA effect for total alkaloids, total nitrogen in Fl and days to flower in F2, respectively. Specific combining ability(SCA) in 83H-5 x Hicks was significant in negative effect for leaf length(F2), number of leaves(F2), leaf shape(F1, F2), bacterial wilt(F2) and alkaloids(F1), and in 83H-5 x NC 2326 in positive effect for leaf length(F1, F2) and leaf width(F2), and for 83H-5 x NC 82 in positive effect for plant height(F1, F2) and leaf width(F2), and for 83H-5 x NC 82 in Positive effect for Plant height(F1, F2), leaf length(F2) and yield(F1, F2).

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.4
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• pp.462-465
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• 1987

Three F$_1$ hybrids, Seokwang/Milyang 54, HR1619-6-2-1-2-2/Milyang 54 and 55061/IR19735-5-2-3-2-1, and their parents were inoculated with each of four individual blast races, IC-l3, IH-l, IA-61 and IB-47, and the mixtures of two races, IC-13 and IH-l, IC-13 and IA-61, and IC-13 and IB-47, respectively. The varietal reactions to the tested races showed that two parental varieties of each cross, Seokwang and Milyang 54, HR1619-6-2-1-2-2 and Milyang 54, and 55061 and IR19735-5-2-3-2-1 have different resistance gene(s) respectively. The F 1 hybrids between two cultivars having different resistant genes were resistant to the mixture of two races of which one race was virulent to one parent and avirulent to the other parent respectively, while the parents of these F$_1$s were susceptible. This may suggest that the F$_1$ hybrids have wider spectrum resistance to leaf blast than their parents.

• Korean journal of applied entomology
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• v.23 no.1 s.58
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• pp.61-67
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• 1984

Conidial germination of Septoria glycines Hemmi, brown spot fungus of soybean, was studied by slide germination test. Poor conidial germination of S. glycines was observed on sterile distilled water, but potato dextrose agar(PDA) and distilled water floated with soybean leaf disc furnished a satisfactory medium for conidial germination. Exogenous supply of carbon source was essential for conidial germination, while phosphorous and potassium were not evident as that for carbon. Soluble starch was the most suitable as a carbon source for conidial germination and followed by D-glucose, D-galactose and lactose in that order. Maximum germination was attained in the $5\times10^{-2}mol$. concentration of glucose. Germination was decreased with increment of conidial concentration and was almost completely suppressed in the density of 10,000 conidia per $mm^2$. It suggested existing a self-inhibitor(s). Non-washed conidia germinated more than washed conidia and this was obvious when the conidia density was over $2\times10^3$ conidia per $mm^2$ on the dry agar block.