山野地에 있어서 標高別 施肥水準의 改良草地의 生産性 및 植生變化에 미치는 影響

全宇福,金元鎬 全南大學校 農漁村開發硏究所 1987 農業科學技術硏究 Vol.22 No.-

This experiment was carried out to evaluate the effect of three rates of N-P2O5-K2O (Light; 140-100-100. Standard: 280-200-240, Increase: 420-400-4007kg/ha), altitude(350m and 500m) and slope exposure(north and south) on dry matter yield, quality and botanical composition of orchardgrasa dominated mountain pasture. The results obtained were summarized as follows: 1. As fertilizer application increased. the dry matter yield of grasses was increased, and average dry matter yield on the north slope was more increased than that on the south slope and 500m than 350m, respectively. 2. The increase of NPK rate resulted in increment of crude protein content of grasses, and crude protein content on the north slope was higher than that on the south slope and 500m than 350m, respectively. However, NDF and ADF content and in-vitro dry matter digestibility was inconsistently affected by their application rates. 3. By increasing the NPK rate, the yield of crude protein of grasses was increased. and the yiels of crude protein on the north slope was more increased than that on the south slope and 500m than 350m, regpectively. 4. The yield of NDF, ADF and in-vitro digestible dry matter was increased as fertlllzer application increased but their differences between standard and increase plot were not significant. The yield of those on the north slope was more increased than that on the south slope and 500m than 350m, respectively. 5. By increasing the NPK rate, the percentage of orchardgrdgrass in botanical composition was increased greatly at all plots, whereas that of the weed and ladino clever was increased at light fertilization plot.

질산염이 축적된 Italian ryegrass 급여에 따른 면양의 혈액중 Methemoglobin 농도의 경시적 변화

윤창,전우복,김광현 全南大學校 農漁村開發硏究所 1991 農業科學技術硏究 Vol.26 No.-

본 시험은 초기생육기간 중 질소비료의 시비 수준에 따른 사료작물내 질산염 함량에 미치는 영향, 그리고 질산염이 축적된 Italian ryegrass를 면양에 급여한 후 시간경과에 따라 면양 혈액중 methemoglobin(MHb) 농도의 변화를 조사할 목적으로 실시하였던 바 그 결과는 다음과 같다. 1. Italian ryegrass의 질산염 함량은 질소 시비수준의 증가에 따라 유의적으로 증가하였다(p<0.05). 2. 면양의 혈액내 MHb 함량의 평균 최고 농도는 22.5%를 나타냈으며 면양기체간의 차이가 매우 심하게 나타났다. 그리고 Italian ryegrass의 일일 DM 섭취량은 554~750g이었으며 조사료내 NO₃-N의 섭취량은 2.715~3.675g이었다. This study was conducted to investigate the influence of the level of nitrogen fertilization and cutting date on the nitrate accumulation in Italian ryegrass, and the influence of nitrate accumulation in Italian ryegrass feeding on the chang of methemoglobin in sheep. 9 Corriedale wethers(average body weight 33kg) were fed Italian ryegrass containing average 0.469% NO₃-N. Blood samples were taken at 1 hour before feeding and 4, 5, 6, 7, 8, 9, 10 hours after feeding, and then methemoglobin concentration in blood were determined. The results obtained were summarized as follows; 1. Significant difference were observed in nitrate concentration in Italian ryegrass when nitrogen fertilizer were applied(p<0.05). 2. There were large variations among the test animals in the capacity of methemoglobin formation of the Italian ryegrass feeding and DM and NO₃-N intake of Italian ryegrass in sheep was 554 to 750g and 2.715-3.675 in a day respectively.

아질산염 투여가 가토의 혈액중 Methemoglobin 형성에 미치는 영향

김광현,전우복,윤창 全南大學校 農漁村開發硏究所 1991 農業科學技術硏究 Vol.26 No.-

본 연구는 가토에 있어서 아질산염 투여 수준에 따른 Methemoglobin(MHb) 및 혈장내 NO₂-농도의 변화를 관찰하고, 동일 수준의 아질산염 투여조건 하에서 투여방법(경구투여 및 피하투여)을 달리했을 때 MHb 형성 정도를 비교하고자 실시하였던 바 그 결과를 요약하면 다음과 같다. 1. 아질산염 투여량의 증가에 의해 가토 혈액 중 MHb 농도는 증가하였는데 MHb 함량의 최고치는 아질산염 투여 후 0.5~1.0 시간째에 나타났다. 2. 아질산염 투여 후 형성된 MHb 농도는 개체간에 큰 차이가 있었다. 3. 아질산염의 경구투여와 피하주사 후 형성된 MHb의 함량의 최고치는 경구 및 피하투여간에 큰 차이가 없었다. This experiment was conducted in order to investigate the tolerance of sodium nitrite as well hematological in responses in rabibits. Twenty Angora rabbits fed on concentrates were administrated intragastrically 30, 60, 90, 120 and 150mg of NaNo₂as 10mg/ml(W/V) aqueous solution. Blood samples were taken at 0.5 or 1 hr, intervals, and time courses of methemoglobin content of blood and NO₂-concentration in blood plasma were examined. The results obtained were as follows; 1. The administration of sodium nitrite to rabbits caused a rise in the methemoglobin levels with maximum concentration of methemoglobin occuring generally after half an hour to an hour and the level of methemoglobinemia gradually decreased thereafter. 2. There were high individual variation among the test animals in methemoglobin content of blood and NO₂-concentration in plasma. 3. No significant difference was observed between intragastric and subcutaneous administration in the maximum level of methemoglobinemia achieved.

간척지에 있어서 목초의 내염성 비교

최원열,최기춘,전우복 全南大學校 農業科學技術硏究所 1996 農業科學技術硏究 Vol.31 No.-

This study was conducted to compare the degree of salt tolerance as kinds of pasture plants in reclaimed coastal land. The experiment was designed with 10 cultivars of pasture plants and salt concentration of three levels. DM yields of perennial ryegrass, tall fescue, tall wheatgrass and alfalfa were higher than those of orchardgrass, birdsfoot trefoil and ladino clover at low salinity. Pasture plants were not grown at high salinity treatment and DM yields of pasture plants at medium salinity was lower than that of low salinity treatment. The growth of perennial ryegrass, tall fescue, tall wheatgrass and alfalfa was better than that of others in reclaimed coastal land.

오차드그라스에 있어서 저장물질의 계절변화 및 예취시기별 사료가치

전우복 ( Woo Bock Chun ) 한국축산학회 1986 한국축산학회지 Vol.28 No.4

This experiment was carried out to evaluate the seasonal variation of total water-soluble carbohydrates (TSC) and crude protein content in orchardgrass stubble and the feed value of orchardgrass by cutting time in the first, second and third crops. This was performed in 2-year-old orchardgrass plots from feb. 25, 1983 to Oct. 25, 1983. The results obtained were as follows: 1. The TSC accumulated during the period of cool season, and declined when the weather was hot and dry. 2. During the period of cool season, the reserve level decreased when new leaf after the start of plant growth emerged and then increased rapidly, however, decreased after seed ripening. 3. Levels of carbohydrate content decreased sharply following the top-dressing applied simultaneously with the cutting. When the top-dressing was followed by a period of hot dry weather, carbohydrate reserves were often reduced to critical levels. In such weather conditions, the top-dressing on orchardgtass should be restricted. 4. Crude protein content increased at the early growth stage and then decreased as the plants aged. Especially, crude protein content increased rapidly following nitrogen fertilization and then decreased. 5. Because the rate of decreasing the feed value in the first crops was larger then that in the second and third crops as cutting time was delayed, the first crops must be cut and utilized when the crops were suitable to be cut.

Orchardgrass 초지의 생산성 및 예취관리에 관한 연구 3 . 사향지 및 표고가 산지초지의 목초품질에 미치는 영향

전우복(Woo Bock Chun),김원호(Weon Ho Kim) 한국축산학회 1988 한국축산학회지 Vol.30 No.5

This experiment was carried out to investigate the effect of slope exposure (north and south) and altitude (250m, 350m and 500m) on the grass quality in mountain pasture. The experiment was allocated as a randomized block design with 4 replications and was undertaken over a period of 20 months from February, 1986 to October, 1987. The results obtained are summarized as follows. 1. Dry matter yield of grasses in mountain pasture was higher on the northern slope than on the southern slope and was high in the following order, beginning with the altitudes least produced; 250m, 350m and 500m above the sea level. 2. Crude protein content of grasses was higher on the north slope than on the south slope, but NDF and ADF content showed the reverse trend. In-vitro dry matter digestibility was not different between the south and north slope. 3. Crude protein content of grasses was high as the altitude was high from 250m to 500m. Otherwise, NDF and ADF content and in-vitro dry matter digestibility was not different among the altitudes. 4. The yield of crude protein, NDF, ADF and in-vitro digestible dry matter was higher on the north slope than on the south slope and was high in the following order, beginning with the altitudes least produced; 250m, 350m and 500m.

Orchardgrass 초지의 생산성 및 예취관리에 관한 연구 1 . 하고기간중 예취시기가 Orchardgrass 의 건물수량 , 조단백질총량 및 탄수화물함량에 미치는 영향

전우복 ( Woo Bock Chun ) 한국축산학회 1987 한국축산학회지 Vol.29 No.7

This experiment was carried out to evaluate the cutting time during summer depression and the yield of the dry matter and crude protein of two year old orchardgrass and conducted from Mar. 1, 1985 to Sep. 15, 1985. The results obtained were as follows: 1. The yield of dry matter and crude protein in the combinations of some different cutting time was the lowest when cut on the 25th of July and followed by a period of hot dry weather. 2. The stand reduction rate of orchardgrass and the growth and development of carbgrass were significantly high when cut on the 25th of July and followed by a period of summer depression. 3. It may be conclude from the above results that the first, second, third and fourth cutting date of orchardgrass should be on the 20th of May, 20th of June, 20th of August and 15th of October, respectively.

재생기간별 Ladino clover 의 수량 , 탄수화물 및 질산태질소함량 변화

전우복 ( Woo Bock Chun ) 한국축산학회 1977 한국축산학회지 Vol.19 No.4

The experiments were carried out to determine the rate of regrowth, the charges of carbohydrates and nitrate contained in the samples right after cutting and the top-dressing time of Ladino clover. Plants were grown in simple growth chamber as well as in the fields from November, 1975 to July, 1976. The temperature, light intensity, and light period were controlled to be 15-20℃, 4250 Lux, and 15 hours. The results obtained were as follows. 1. The period of recovery to initial stands after cutting was about 3 weeks in terms of dry matter and about 2 weeks in carbohydrate content. 2. The content of carbohydrates and nitrate of plant parts was the heightest in stolon, and the lowest in roots. 3. Cutting resulted in a temporary decrease of total water-soluble carbohydrates (T.S.C.) in the shoots while the nitrate content tended to increase temporally. Similar trends. were observed when the plants were left intact with potassium top-dressed. 4. The potassium applied simultaniousely with the cutting was more effective to stimulate regrowth than that applied after cutting, however, both of the simultanious and after cutting application were still better than application prior to cutting

재생기간별 Orchardgrass 의 수량 , 탄수화물 및 질산태질소함량 변화

전우복 ( Woo Bock Chun ) 한국축산학회 1980 한국축산학회지 Vol.22 No.1

This experiment was carried out to determine the regrowth rate of orchardgass immediately after cutting and top-dressing, and also to study the changes of carbohydrates and nitrate in the plant. The plant used in this experiment was grown in simple growth chamber from September, 1978 to January, 1979. The temperature, light intensity, and light period were controlled to be 15-20℃, 4,250 Lux, and 15 hours. The results obtained were as follows 1. The period of recovery to initial stands of ter cutting was about 4 - 5 weeks in terms of dry matter and about 5 weeks in the content of total water-soluble carbohydrates(T. S. C). 2. The content of total water-soluble carbohydrates of plant parts was the highest in sheaths, and the lowest in roots, and the content of nitrate was the highest in blades, and the lowest in roots. 3. Cutting resulted in a temporary decrease of total water-soluble carbohydrates in the shoots. The nitrate content decreased directly after cutting and increased gradually, however, the changes of nitrate in the shoot s and roots did not show the same trends.

Orchardgrass 초지의 생산성 및 예취관리에 관한 연구 4 . 산지초지 사초의 무기물함량과 grass tetany 위험성

전우복(Woo Bock Chun),정완태(Wan Tae Chung) 한국축산학회 1988 한국축산학회지 Vol.30 No.6

Mineral contents of grasses in Chonnam mountain pasture were investigated during growing season in 1986 and 1987 to study the nutritional problems on the cattle disease of hypomagnesemia (grass tetany). Grass samples of the first, second, third and fourth cuts were analyzed for Ca, Mg, K, Na and P concentration. Results obtained were as follows. 1. Mean concentration of Mg and K in grasses was about 0.3% and 4.65%, respectively and equivalent ratio of K/Ca+Mg was about 2.13. Critical and abnormal levels of minerals incident to induce grass tetany were found in grass samples of mountain pasture. 2. Especially, the high rate of abnormal and critical K/Ca+Mg ratio of the grasses in mountain pasture was due to the high K level of the soil 3. The Ca/P ratio of grasses was about 2.78 and high amount of P fertilizer should be applied to maintain the optimum Ca/P ratio in grasses.