• Korean Journal of Soil Science and Fertilizer
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• v.1 no.1
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• pp.13-26
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• 1968

To establish the most efficient method of nitrogen and phosphorus fertilization in paddy rice a series of internationally coordinated research using $N^{15}\;P^{32}$ isotopes were carried out from the year 1962 through 1967, supervised by the Joint FAO/IAEA Division of Atomic Energy in Agriculture under the auspicies of FAO, UN. In Korea College of Agriculture, Seoul National University had been participated in the Coordinated Research Programme from the year 1963 through the last year, arid the results obtained through the six years' researches are summarized as follows: 1. In the application of superphosphate broadcasting or placement at the surface of paddy as basal dressing was most efficient. 2. Split or late application of superphosphate did not affect the grain yield of the rice, but its efficiency in the rice plant uptake was less than in the case of basal dressing of whole amounts. 3. The contents of available soil phoshorus of the experimental sites in Korea were above 60 ppm, and the efficiency of phosphorus utilization of the rice from the fertilizer was approximately 10 per cent. The grain yield response of the rice to phosphorus application in Korea was rather small comparing to those of other countries. 4. The nitrogen uptake of the rice plants from the fertilizer was most efficient when the fertilizer was applied at the time of ear prime growth. However, the most efficient utilization of nitrogen did not necessarily accompany the maximum yield of the rice and basic application of adequate amount of nitrogen was required to secure proper number of panicles. 5. In the application of nitrogenous fertilizer shallow placement at 5 cm depth was most efficient. The effect of split application of nitrogen was not so noticeable. It seemed due to the fact that total application amount of nitrogen, 60 kg N/ha, was smaller than that of usual dosage in Korea. 6. The efficiency of nitrogen utilization of the rice from the fertilizer was about 40 percent in Korea, and the yield reponse of the rice plant to nitrogen application was remarkable comparing to those of other countries, showing the marked differences in the fertilizer efficiency and grain yield according to the application method. 7. The nitrogen uptake of the rice plant was not likely affected by the time and the rate of phosphorus application whereas the efficiency of phosphorus utilization was affected to some degree by the method of nitrogen application.

• Journal of agricultural medicine and community health
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• v.2 no.1
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• pp.36-42
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• 1977

A study on blood pressure and hematocrit values of 1,559 people in 19 Korean rural areas was carried out in 1974 and the results were analyzed statistically. Obtained as follows: 1. The blood pressure according to sex and age groups (from the twenties to the seventies) was as follows: 1) The blood pressure of male by age group il) In the twenties, M (mean) was 125. 85/74, 15mm/Hg, a (standard deviation) was 15.9/10.2, and ill (standard error) was 1.55/0.99. (2) In the thirties, ${\delta}$ was 123.93/77.19 mm/Hg, a was 14.4/10.8, and m was 1.24/0.93. (3) In the forties, M was 128.44/81.15 mm/Hg, a was 23.9/14.7, and m was 2.16/1.33. (4) In the fifties, M was 128.48/181.24 mm/Hg, a was 24.7/13.9, and m was 2.05/1.16. (5) In the sixties, M was 135.80/81.70 mm/Hg, a was 27.4/18.8, and ${\delta}$ was 2.74/1.88. (6) In the seventies, M was 146.84/83. 16mm/Hg, ${\delta}$ was 24.5/10.0, and m was 5.62/2.30. 2) The blood pressure of female by age group (1) In the twenties, M was 117.89/73.33 mm/Hg, ${\delta}$ was 15.7/12.1, and m was 1.42/1.09. (2) In the thirties, M was 118.04/75.71 mm/Hg, ${\delta}$ was 16.9/13.0, and m was 1.13/0.87. (3) In the forties, M was 120.92/78.17 mm/Hg, ${\delta}$ was 20.9/12.9, and m was 1.42/0.87. (4) In the fifties, M was 122.14/79.55 mm/Hg, ${\delta}$ was 24.2/15.9, and m was 1.63/1.07. (5) In the sixties, M was 131.57/84.29 mm/Hg, ${\delta}$ was 28.4/16.9, and m was 2.58/1.53. (6) In the seven ties, M was 139.62/86, 54 mm/Hg, ${\delta}$ was 22.4/15.7, and m was 4.38/3.09. And the range of systolic blood pressure in male was 70~230 mm/Hg and in female was 80-230 mm/Hg. The range of distolic blood pressure in male was 50~160 mm/Hg and in female was 40~140 mm/Hg. 2. The hematocrit value according to sex and age groups was as follows: 1) The hematocrit values of male by age group (1) In the twenties, M was 42.72%, ${\delta}$ was 3.05, and m was 0.30. (2) In the thirties, M was 41.77%, ${\delta}$ was 3.29, and m was 0.28. (3) In the forties, M was 41.39, ${\delta}$ was 3.86, and m was 0.35. (4) In the fifties, M was 40.12%, ${\delta}$ was 3.65, and m was 0.30. (5) In the sixties, M was 39.88%, ${\delta}$ was 3.81. and m was 0.38. (6) In the seventies, M was 38.47%, ${\delta}$ was 2.27, and m was 0.52. 2) The hematocrit values of female by age group (1) In the twenties, M was 35.40%, ${\delta}$ was 3.37, and m was 0.30. (2) In the thirties, M was 35.50%, ${\delta}$ was 3. 35, and m was 0.22. (3) In the forties, M was 35.75%, ${\delta}$ was 3. 18, and m was 0.22. (4) In the fifties, M was 35.84%, ${\delta}$ was 3.30, and m was 0.22. (5) In the sixties, M was 35.70%, ${\delta}$ was 3.35, and m was 0.30. (6) In the seventies, M was 35.08%, ${\delta}$ was 3.08, and m was 0.60. The range of hematocrit values in male was 23~50% and in female was 18~50% (un associated with age groups). 3. In comparison with the blood pressure and the value of hematocrit of study groups showed that the blood pressure raised higher but the value of hematocrit got lowered on the contrary as the groups are getting older. 4. Total number of patients with hypertension was 165(10.6%) which were consisted with 71 male (11.3%) and 94 female (10.1%). But only two cases of the male patient and one case of the female patient were associated with protein uria. 5. The incidence of anemia by hematocrit values was as follows: 1) The incidence of male anemia patients based on$\leqq$41% ($\leqq$39%). (1) In the twenties, incidence was 43.90% (16.98%). (2) In the thirties, 41.48% (25.93%). (3) In the forties, 42.62% (25.41%). (4) In the fifties, 62.76% (40.69%). (5) In the sixties, 70% (38%). (6) In the seventies, 84.21% (73.68%). 2) The incidence of female anemia patients bailed on $\leqq$35% ($\leqq$34%). (1) In the twenties, incidence was 43.90% (37.39%). (2) In the thirties, 48.21 % (33.93%). (3) In the forties, 43.58% (32.57%). (4) In the fifties, 45.91 % (34.09%). (5) In the sixties, 47.11% (37.19%). (6) In the seventies, 50% (46.15%) 6. The incidence rate of anemia patients with hypertension was highest in the age group 51~60 in male and 31~40 in female.

• Radiation Oncology Journal
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• v.14 no.1
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• pp.9-15
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• 1996

Purpose: The traditional approach with surgery and/or radiotherapy(RT) for advanced head and neck cancer Provides anticipated cure rates of $10-65\%$ depending on stages and sites. Recently, combined modality with chemotherapy have been extensively investigated in attempts to improve survival and local control. We retrospectively analysed our experience of 31 patients with advanced head and neck cancer. Materials and Methods : November 1983 to October 1994. 31 Patients with Stage III and IV squamous cell head and neck cancer were treated with RT. Sixteen patients were treated with RT alone, and IS patients were treated with combined RT plus chemotherapy. All patients were treated with 4-MV LINAC and radiation dose ranged from 5000 cGy to 7760 cGy (median 7010 cGy). In combined group, 7 patients were treated with cisplatin plus 5-FU 2 patients were treated with methotrexate plus leucovorin plus 5-FU plus cisplatin or carboplatin, and 6 patients were treated with cisplatin as a radiosensitizer. Results : Median follow up period was 16 months (range 4-134 months). The major responses (CR+PR) were noted in 10 patient ($66.6\%$) of the RT alone group and 14 patient ($93.3\%$) of the chemoradiation group. There was no statistical difference in CR rate between the two groups The overall survival rates at 5 years were $23.4\%$ in the radiation alone group, $23.5\%$ in the chemoradiation group Disease-free survival rates at 3 years were $44.5\%$ in the radiation alone group, $40\%$ in the chemoradiation group. There was no statistical differences in overall survival rates and disease-free survival rates between the two groups. Local recurrences occurred in $71.5\%$ of the radiation alone group, $72.7\%$ of the chemoradiation group and distant metastasis occurred in $14.4\%$ of radiation alone group, $9.1\%$ of the chemoradiation group. The frequencies of complications were comparable in both groups except hematologic toxicity Conclusion : Total response rates in the combined chemotherapy and radiotherapy was relatively higher than radiotherapy alone. But our result failed to show any survival benefit of the combined chemotherapy and radiotherapy. The accrual of large number of patients and long term follow-un may be necessary to confirm the present result of combined chemotherapy and radiotherapy.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.55 no.1
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• pp.76-82
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• 2010

Experiments were conducted to investigate seed persistence of Chinese milk vetch(CMV) in naturally reseeded rice field in 2007~2009. The seed and pods with seeds were buried in rice field at 0, 5 and 10 cm depths and retrieved from the field at one to three month intervals from July to the following year March and determined change of seed dormancy and viability. In the second experiment, persistence of the CMV seeds in the naturally reseeded rice field at different tillage methods and soil depths were also investigated after rice harvest in autumn. Burial depths and durations affected recovery rate, dormancy and viability of CMV seed. The viability loss was faster and greater in the seed than the pod with seeds and on the soil surface than the 5 or 10 cm burial depths. The recovery rate of CMV seed was decreased starting from one month as seed burial and it was significantly decreased to 52~65% for the seed in September. However, unlike the seed burial, the nearly 100% CMV seeds were recovered for burial as pod with seeds even after four months burial in both 0 and 5 cm depths. However, the recovery rate was sharply declined to below 30% at October in 2007 in both seed and pods with seeds and in the 2008/2009 experiment. the 15~47% of CMV seeds still remained even after October. The CMV had high seed dormancy of 95%, showing only 4~5% germination at the beginning in June but the seed germination increased to 25 to 35% in seed and 55 to 61% in pod with seeds in September due to breakage of hard seed dormancy. The viability loss was faster in the seed than in the pod with seeds regardless of depths of placement in the soil base on decayed seeds. Also the seed placed on the soil surface lost viability faster than the 5~10 burial depths. On the other hand, field observation in the naturally reseeded CMV rice field showed that as many as 917~2,185 CMV seeds $m^2$ were from the 0~15 cm soil depth in the rotary tillage and 250~10,105 CMV seeds in minimum tillage treatmints. The recovered seed germinated 25~33%, 23~43% but still had high percentage of hard seed having 64~72% and 51~77% even after rice harvest in autumn. These results indicate that freshly harvested CMV seeds had high level of primary dormancy and the dormancy was gradually broken in soil with time during rice cultivation periods and appreciable number of CMV seeds remained even 4 month after burial in soil. CMV plant regenerated naturally from the remained seed bank at rice harvest time in autumn. The CMV seedling still emerged even after 2 years of continuous destructive killing of emerged CMV plant by rotary tillage in naturally reseeded CMV plant in rice field, indicating that CMV seeds do persistent as least two years in soil.