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예취빈도 및 질소수준이 혼파초지에 미치는 영향 2 . 예취 및 N의 효율 , 식생구성비율 , N의 함량 및 회수율
정연규,윤상기,이종열 ( Yeun Kyu Jung,Sang Gi Yun,Jong Yeal Lee ) 한국축산학회 1981 한국축산학회지 Vol.23 No.6
This field experiment was undertaken to assess the effects of cutting frequency (3, 4, 5, 6 times) and N rate (0, 15, 30, 40 ㎏/l0a) on the efficiencies of cutting, the efficiency of the N, the botanical composition, and the percentage recovery and content of N of different forage species and mixed forages within a mixed grass/clover sward, 1. By increasing the cutting frequency, the efficiency of cutting(DM ㎏ per cut) to grass and total yields was reduced, whereas with legumes yield did not change or increased slightly until 5 cuttings. At 6 cuttings it reduced, Efficiency of weed yield was highest with 5 cuttings, 2. The efficiency of N (DM ㎏ per ㎏ N) to grass and total yield was highest with 15㎏ N at all cutting frequencies, It was reduced by increasing the N rate over 15㎏ N, N application to legume yield had minus value with the lowest at 15 ㎏ N, This minus value was lower under frequent cutting, 3. The ratio of grass/clover was greatly increased by increasing the N rate, but this increase was eliminated by increasing the cutting frequency, This ratio was further reduced by increasing cutting until 5 cuttings, which was the lowest. At the 6 cuttings, there was a small increase in the ratio 4. By increasing cutting (spring-summer-autumn), grass was reduced and legume increased. 5. Percentage recovery of N in the mixed sward was increased by increasing the cutting, This was mainly due to the increasing N content in the mixed forage according to the increased ratio of legume and by cutting at a younger stage, and the efficiency of N etc. 6. The efficiencies of cutting and the efficiency of N, the grass/clover ratio, the percentage recovery and the content of N in a mixed sward were all differentially influenced by botanical composition, cutting frequency, N rate and the interaction between all of these factors.
석회 및 3 요소 시용수준이 겉뿌림 산지초지에 미치는 영향 2 . 수량구성요소 식생구성비율 및 목초율의 변화
정연규,윤상기,김정갑 ( Yeun Kyu Jung,Sang Gi Yun,Jeong Gab Kim ) 한국축산학회 1982 한국축산학회지 Vol.24 No.6
This field experiment was undertaken to assess the effects of two rates of Ca(OH)₂ (0, 250 ㎏/l0a) and five rates of N-P₂O_5-K₂O (0-0-0, 0-10-10, 6-15-15, 12-20-20, 24-25-20 ㎏/l0a) on the grassland establishment, forage yield and quality, botanical composition,, and persistence of different forage species in a mixed grass/ clover sward established by oversowing method on new reclaimed steep mountain. This second part is concerned with the yield components, botanical composition, and performance of different grass species. The results obtained were summarized as follows; 1. Yields and botanical compositions of grasses and legume, and rate of seeded forages in mixed sward were greatly increased by liming. The yield and botanical composition of weeds were reduced by both liming and increasing the NPK rate. By increasing the NPK rate, the yield and botanical composition of grasses, and the rate of seeded forages were greatly increased. The regrowth of cut shrubs was controlled by both lime and NPK applications The rate of yield increase of grasses in mixed sward by increasing the NPK rates tended to be relative higher with liming than no lime. 2. At no lime, legume in mixed sward was almost disappeard, and no significant effect of NPK application on persistence of legume was found. On the other hand, legume in mixed sward was good established by liming, and that yield and botanical composition were highest with 6-15-15 (N-P₂O_5-K₂O ㎏/l0a) rate. The yield of weeds in mixed sward was highest with low rates of NPK, and that reduced with control and moderate rate of NPK. 3. Lowest application rates of N-P₂O_5-K₂O to maintain the above 50% in the mean rate of seeded forages were 12-20-20 ㎏/l0a rate at no lime and 6-10-10 rate at liming. Increments of rate of seeded forages and legume as affected by liming resulted in the forage production with good quality. 4. Mean botanical compositions of the seeded different grass species (∑ grass=100%) in a mixed grass/clover sward were highest in the following order; Orchardgrass (65%)$gt;Tall, Meadow and Red feseues (25%)$gt; Redtop (4.5%)$gt;K. bluegrass (4%)$gt;P. ryegrass (1.5%). Liming increased gently mean botanical composition of Fescues and reduced that of Redtop in seeded grasses, while these of Orchardgrass, K. bluegrass, and P. ryegrass were inconsistent. By increasing the NPK rate, that was increased markedly in Orchardgrass and gently in Fescues, whereas that tended to be reduced in other grass species.
박범영,조수현,황인호,김진형,오석중,이종문,윤상기,Park Beom-Young,Cho Soo-Hyun,Hwang In-Ho,Kim Jin-Hyoung,Oh Suk-Jung,Lee Jong-Moon,Yun Sang-Gi 한국축산식품학회 2004 한국축산식품학회지 Vol.24 No.3
이유자돈 시기 25∼70일령까지 글루코사민 유도체를 1일 1두당 3 mL급여한 돼지와 급여하지 않은 돼지의 도체등급 특성과 육질특성을 비교한 결과는 다음과 같다. 도체중과 등지방층 두께는 시험구와 대조구간 유의적인 차이를 보이지 않았으나, 시험구가 표준오차가 적어 균일도가 높은 것으로 조사되었다. 도체등급 판정결과 최종 A등급 출현율을 비교했을 경우에는 시험구 및 대조구에서 각각 48.7%, 29.2%로 시험구가 약 19.5% 높은 출현율을 보였다. 돼지고기의 육질을 비교한 결과 육색, 가열감량, 전단력, pH 보수성, 육즙분리율 등 대부분의 육질에서 유의적인 차이를 보이지 않았으나(p>0.05), 일반성분중 단백질과 회분은 시험구가 유의적으로 높은 경향을 보였다. 본 시험결과 이유후 육성돈 시기에 글루코사민 유도체의 급여는 육질에는 큰 차이가 없으나, 출하일령 단축과 도체등 급에서의 규격돈 생산에는 효과가 있는 것으로 나타났다. The feeding group, composed of weaning pigs fed 3 mL of glucosamine derivatives, was compared for the carcass and quality characteristics with the unfeeding control group for 25∼70 days since they were born. The results were as follows; There were no significant differences in carcass weight and back-fat thickness between the feeding group and the unfeeding group although the feeding group had low ranges of standard error when compared to the control. Feeding group had higher incidence frequencies of A grade (42.7%) than the control (29.2%). The feeding group and unfeeding group had no significant differences in meat color, cooking loss, WBS, pH, WHC and purge loss. Results from this study showed that feeding GD had effect on the decrease the market weight and production of consist carcass weight, however, the feeding GD had no effect on pork quality during rearing times after weaning.
오현경 ( Hyun Kyung Oh ),임현정 ( Hyun Jeong Lim ),윤상기 ( Sang Gi Yun ) 한국녹지환경디자인학회 2008 녹지환경학회지 Vol.4 No.3
The flora of Bonggokje, Yonghoje in Hyoja area, Jeonju were listed 44 taxa composed of 20 families, 35 genera, 40 species, 4 varieties. The hydrophytes were listed 8 taxa (Typha orientalis, Phragmites communis, Paspalum distichum var. distichum, Scirpus karuizawensis, Salix glandulosa, Salix koreensis, Persicaria thunbergii, Trapa japonica). The naturalized plants were listed 10 taxa (Rumex obtusifolius, Chenopodium ficifloium, Amaranthus lividus, Phytolacca americana, Brassica juncea, Xanthium canadense, Bidens frondosa, Sonchus asper, Sonchus oleraceus, Paspalum distichum var. distichum) and naturalization rate was 22.7% of all 44 taxa of vascular plants. Ecosystem disturbing wild plants like Paspalum distichum var. distichum have been increasing. Therefore, continuous control and conservation measures are needed on the ecosystem. The actual vegetation community of Bonggokje were classified into Bidens frondosa-Typha orientalis, Paspalum distichum var. distichum, Phragmites communis, Salix glandulosa-Salix koreensis, Typha orientalis community and Yonghoje were classified into Persicaria hydropiper, Echinochloa crusgalli, Trapa japonica, Paspalum distichum var. distichum community.
오현경 ( Hyun-kyung Oh ),손병율 ( Byeong-yul Son ),윤상기 ( Sang-gi Yun ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2016 한국환경복원기술학회지 Vol.19 No.3
This study is a survey of the flora distributed in Seocheon tidal flat wetland protected area of nearby island (Daejuk-do, Tokki-deung, Muk-do) and Yubo-do Seocheon-gun Chuncheongnam-do, Korea. The numbers of vascular plants were summarized as 231 taxa including 65 families, 167 genera, 204 species, 2 subspecies, 23 varieties and 2 forms. The halophytes were 33 taxa including 15 families, 29 genera, 29 species, 3 varieties and 1 form (Chenopodium album var. stenophyllum, Cnidium japonicum, Juncus haenkei and so on). The rare plants were 4 taxa including Pseudoraphis ukishiba (VU), Belamcanda chinensis (VU), Phacelurus latifolius (LC) and Polygonum bellardii (DD). The Korean endemic plants were 2 taxa including Salix pseudolasiogyne and Forsythia koreana. In the specific plants by floristic region were 24 taxa, a degree Ⅰ were 19 taxa (Rhodotypos scandens, Zanthoxylum planispinum, Cynodon dactylon and so on), 2 taxa of a degree Ⅲ (Elymus mollis and Asparagus oligoclonos), 3 taxa of a degree Ⅳ (Polygonum bellardii, Wisteria floribunda and Pseudoraphis ukishiba) and degree Ⅱ, Ⅴ were not found. The naturalized plants were 40 taxa including Phytolacca americana, Sicyos angulatus, Lactuca scariola and so on. Naturalization rate (NR) was 17.3% of all 231 taxa of vascular plants and urbanization index (UI) was 12.5% of all 321 taxa of naturalized plants. This study was performed to used as a basic data to identify the protected from plant ecosystems of type classify into analyze the vegetation characteristic of based on flora distributed in Yubu-do and nearby islands.