정착후 질소시비가 Orchardgrass 의 건물중 , 탄수화물 , 질산태질소 및 조단백질 함량에 미치는 영향

전우복,김동암 ( Woo Bock Chun,Dong Am Kim ) 한국축산학회 1981 한국축산학회지 Vol.23 No.2

This experiment was carried out to evaluate the effect of nitrogen fertilization on the rate of growth, and the changes of carbohydrate, nitrate-nitrogen and crude protein content contained in the samples after seedling establishment of orchardgrass. Plants were grown in the pots fertilized light and increasing nitrogen, till dune 13, 1979 after sowing on the, April 12, 1979. The result, obtained were a, follow; 1. Dry matter yield in the pots fertilized increasing nitrogen way more than that in light nitrogen with aging. The liberal use of nitrogen fertilizers after seedling establishment stimulated the growth of orchardgrass in the early growing stage. 2. The convent of total water-soluble carbohydrate, (T. S. C) m stubble, leaves and shoots temporally decreased following nitrogen fertilization after seedling establishment, after which it again increased, and that of plant parts in the pots fertilized increasing nitrogen decreased more than that of plant part; in light nitrogen. 3. Stubble were higher in the content of total water-soluble carbohydrates (T. S. C.) than leaves, and the content of total water-soluble carbohydrate, (T. S. C.) of plant party decreased by tillering. 4. Nitrate-nitrogen content decreased following nitrogen fertilization and gradually increased, however, it was shown again trend, decreased at the end of experiment. Crude protein content rapidly increased immediately following nitrogen fertilization, however, it gradually decreased.

파종시 질소시비가 월동전후 오차드그라스의 생장 , 탄수화물 및 조단백질 함량에 미치는 영향

전우복,김동암,박종만 ( Woo Bock Chun,Dong Am Kim,Jong man Park ) 한국축산학회 1986 한국축산학회지 Vol.28 No.3

This experiment was carried out to evaluate the effect of nitrogen fertilization on the rate of growth and the accumulation pattern of total water-soluble carbohydrates and crude proein in orchardgrass cv. potomac before and after winter. Plants were grown in the pots under different levels of nitrogen fertilizer (3㎏, 6㎏ and 10㎏ per 10a) from 21 September, 1979 to 25 April, 1980 at experimental field of Chonnam National University in Kwangju. The resultes obtained were as follows: 1. Plant heights before winter were increased continuously and reached its peak an about December 5 with the average temperature of 5℃ and then decreased. However, plant leaves, tillers and dry matter in the shoots increased until the end of December, below average temperature of 5℃. 2. The total water-soluble carbohydrates (TSC) in the basal tissue before winter accumulated until the end of December, below average temperature of 5℃. The reserved carbohydrates in the basal tissue after winter decreased when new leaf after the start of plant growth emerged and then increased with morphological development. But the content of TSC decreased again after emergence of tiller and then increased. Crude protein content in the basal tissue both before and after winter decreased as plants aged.

한국 재래피 ( 삼 ) 의 생장 및 양분대사에 관한 연구 2 . 파종 및 예취후 생장 및 질산태질소 함량 변화

전우복,박종만,김동암 ( Woo Bock Chun,Jong Man Park,Dong Am Kim ) 한국축산학회 1978 한국축산학회지 Vol.20 No.2

This experiment was carried out in order to study the plant growth and change. of nitrate-nitrogen content in the seedlings and ratoon crops of Japanese millet[Echiochloa crusgalli var frumentacea (Roxb.) Wight]. The resultes are as follws. 1. The maximum values of crop growth rate (CGR), relative growth rate (RGR), net assimalation rate (NAR), and leaf area ratio (IAR) occurred earlier than that of leaf area index (LAI) in the plots where seedlings were left to grow without cutting, however, when cuttings were practiced those were observed to appear almost simultaniously with that of leaf area inlet (LAI). 2. The maximum crop growth rate(CGR) of the seedlings appeared at the stage of stem elongation, while that of the ratoon crops occurred in 28 to 35 days after cut. 3. Leaf blade was higher in total nitrogen content but lower in nitrate-nitrogen than leaf sheath and stem. 4. Nitrate-nitrogen content was very high in the early growing stage of seedlings as well as ratoon crops, however, it gradually decreased with aging. Therefore the results of this experiment suggested that these would be a danger of nitrate poisoning to ruminants in case of feeding large amount of Japanese millet in early stage of growth.

Ladino clover 및 Orchardgrass 의 양분대사와 예취관리에 관한 연구 3 . 예취전후 추비처리한 Orchardgrass 의 수량 , 탄수화물 , 질산태질소 및 조단백질함량 변화

전우복,김동암 ( Woo Bock Chun,Dong Am Kim ) 한국축산학회 1980 한국축산학회지 Vol.22 No.3

The experiment was carried out to evaluate the effect of top-dressing before and after cutting on the rate of regrowth and the changes of carbohydrate, nitrate and crude protein contained in the samples after cutting of Orchardgrass. Plants were grown in the fields from April 8 to July 12, 1979 The result obtained were as follows. 1. The increase of dry matter was delayed by the cutting, but in the latter term of growth the increasing rate of dry matter in cut shoots was higher than that in uncut shoots. 2. Cutting resulted in a temporary decrease of total water-soluble carbohydrate (T. S. C.) and nitrate content in the shoots while the crude protein content tended to increase temporally. Similar trends were observed when the plants were left intact with top-dressing. 3. The period of recovery to initial stands after cutting about 4 - 5 weeks was in terms of dry matter and total water-soluble carbohydrates. 4. The top-dressing applied simultaneously with the cutting was more effective to stimulate regrowth than that applied after cutting, however, both of the simultaneous and after cutting application were still better than application prior to cutting.

한국재래피 ( 삼 ) 의 생육시기에 따른 수량 , 사료성분 및 소화율의 변화

전우복,류노현 ( Woo Bock Chun,No Hyeon Ryu ) 한국축산학회 1982 한국축산학회지 Vol.24 No.4

This experiment was carried out in order to increase the utilization of feed value of Japanese millet. Japanese millet was seeded on May 9. 1979, and the samples were taken at 7-days intervals for the duration of 45-80 days after seeding. From the feed compositions and in vitro dry-matter digestibility (IVD) measured, the results obtained were as follows; 1. The content of crude protein was highest at 45 days after seeding, and decreased rapidly afterwards. 2. In general, the content of crude fiber increased greatly from 52 to 59 days after seeding, and that of NFE did not change through the period of vegetation. However, the in vitro dry-matter digestibility (IVD) of Japanese millet was high in the early growing stage, and decreased gradually with ageing. The rate of increase of the total digestible dry matter per l0a was highest at the days of 66th and 73th day after seeding. 3. Comparing the content of crude protein with that of crude fiber in the fraction, the content of crude protein in the blade fraction increased as compared with that of crude protein in the sheath-stem fraction in the early growing stage, but that of crude fiber decreased. 4. There was a significant positive correlation (P$lt;0.01) between the in vitro dry-matter digestibility (IVD) of the whole sample by two-stage method and the content of crude protein, and was a significant negative correlation (P$lt;0.01) with the content of crude fiber. There was a significant correlation between the in vitro dry-matter digestibility (IVD) of the fraction and its feed compositions. 5. In the one-stage in vitro dry-matter digestibility (IVD) using rumen liquor procedure of the whole sample, the IVD after 48 hour and 72 hour fermentation was similar each other from 45 to 52 days after seeding, but the variation of the IVD in both fermentation times was found as Japanese millet matured. Comparing the IVD of one-stage method with that of two-stage method, the latter was higher through the period of vegetation.

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.

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.

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.