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고온기 초지의 예취관리에 관한 연구 6 . 고온기간중 예취높이와 질소 및 칼리추비가 혼파초지의 식생과 수량 및 목초품질에 미치는 영향
서성(S . Seo),조무환(M . H . Jo),박문수(M . S . Park),이종경(J . K . Lee),한영춘(Y . C . Han) 한국축산학회 1988 한국축산학회지 Vol.30 No.8
A field experiment was carried out to determine the effects of cutting height at the third cut and application of N and K₂O after cutting during mid-summer season on the soil temperature, plant height, grass coverage, percentages of grass and legume, yield and grass quality in orchardgrass dominated pasture. With three cutting heights (3, 6 and 9㎝) and 4 fertilizer levels (0, N 50㎏, K₂O 50㎏, and N 50㎏ + K₂O 50㎏ ㏊^(-1)), present experiment was conducted at Livestock Experiment Station, Suwon in 1987. 1. The soil temperature after the third cut was rapidly elevated, and lower value was observed with 9㎝ of cutting height through the regrowth period. Plant height after cutting was remarkably increased with higher stubble height regardless of fertilizer levels. 2. The grass coverage and percentage of grass were increased as stubble height was high, while the influence of fertilizer on those was very little. Application of N and K₂O with lower stubble height significantly increased the percentage of bareland. 3. The yield at the third cut was decreased with higher height. But the regrowth yield was significantly increased as the cutting height was increased regardless of fertilizer levels. Regrowth yield was great at N 50㎏ + K₂O 50㎏ $gt; 0 $gt; K₂O 50㎏, N 50㎏, in that order. However, there were not significantly different on regrowth yield among fertilizer treatment. 4. The contents of crude protein, crude fat, crude ash, P, K and Ca were decreased as stubble height was high, and that of crude fiber was increased at 9 ㎝ cutting height. Also the influence of N and K₂O fertilizer on grass quality was little.
질소시비수준이 수수 - 수단그라스 잡종과 다른 사료작물의 재생과 저장탄수화물함량 및 건물수량에 미치는 영향
이종경(J . K . Lee),서성(S . Seo) 한국축산학회 1988 한국축산학회지 Vol.30 No.7
This field experiment was carried out to determine the effects of nitrogen (N) fertilization on the dry matter yield, crude protein yield, carbohydrate reserves in stubble, dead stubble after cutting, tillering and branching of sorghum-sudangrass hybrid (Sorghum bicolor (L.) Moench), pearl millet (Pennisetum typhoides (Burm.) Stapf & C.E. Hubb.) and teosinte (Euchlaena mexicana Schrab.). The main plot was three summer forage crops, and the subplot was three N levels (0, 200 and 400㎏/㏊). The experiment was performed at College of Agriculture, SNU, Suweon in 1984. The results obtained are summarized as follows: 1. Dry matter yield was significantly (P$lt;0.05) increased with increasing N level, regardless of forage crops. Among three species, the yield of sorghum-sudangrass hybrid was the highest. 2. The percentage of crude protein was increased with increasing level of N. Pearl millet showed the highest percentage of crude protein at the second cutting, and the sorghum-sudangrass hybrid produced the highest total protein yield. 3. The content of carbohydrate reserves in stubble was decreased rapidly after the second cutting, and it was recovered to original state after two weeks. And the carbohydrate reserves was tended to be decreased with higher N level, but it was affected little by forage crops. 4. The number of dead stubble after cutting was significantly (P$lt;0.05) increased with increasing N level. Dead stubble after the second cutting was observed more than that of the first cutting. The number of tiller and branch after cutting were tended to be increased with increasing level of N. 5. In conclusion, this experiment suggested that the more yield of three forage crops could be obtained favorably with 200 ㎏ N/㏊, and the sorghum-sudangrass hybrid produced the highest yield during summer season.
제주지역 초지에서 혼파조합 및 질소수준이 식생구성 및 사초생산성에 미치는 영향
박형수,황경준,박남건,김원호,이종경,김종근,이기원,임영철,Park, H.S.,Hwang, K.J.,Park, N.G.,Kim, W.H.,Lee, J.K.,Kim, J.G.,Lee, K.W.,Lim, Y.C. 한국축산환경학회 2009 축산시설환경학회지 Vol.15 No.3
본 연구는 친환경축산의 실천 및 유기조사료 생산을 위해 방목초지에서 혼파조합 및 질소시비 수준이 식생구성과 사초생산성에 미치는 영향을 평가하기 위하여 수행되었다. 본 시험은 2003년 8월부터 2005년 12월까지 난지농업연구소 시험포장에서 실시하였다. 시험처리는 혼파조합을 주구로 질소 시비수준을 세구로 하는 9처리 3반복 분할구배치법으로 배치하여 사초생산성과 식생구성변화를 조사하였다. 목초의 총 건물생산량은 두과혼파에 의해 높은 증가(P<0.01)를 보였으며, 질소시용 수준간에는 뚜렷한 차이를 보이지 않았으며 식생구성비율은 1년차 봄에 화본과의 비율은 80% 정도의 비율을 차지하였으나 여름과 가을에는 두과 비율이 94% 이상의 높은 비율을 나타냈다. 혼파조합에 따른 조단백질 함량은 화본과 단파구(T1) 보다 두과목초 혼파구가 14.9%에서 18.0%로 평균 3.1% 높게 나타났으며 질소시비 수준에 따라서는 16.6~17.5%로 뚜렷한 차이를 보이지 않았다. A study was conducted to determine the effects of seed mixture and nitrogen application levels on botanical composition and forage productivity in grazing pasture. Legume forage have the ability to take nitrogen from the atmosphere and convert it into a form usable by plants. Including legumes in mixtures with grass lowers the amount of nitrogen fertilizer required to produce forages. Dry matter (DM) yield of grass-legume mixtures was more than that of grass mono-cultivated and grass+white clover+red clover mixtures was the highest as 17,391 kg/ha in legume mixture (P<0.01). The highest DM yield was in N-200 kg/ha, but it was similar between N-100 kg/ha(15,128) and N-200 kg/ha (16,017). The large decline in the proportion of grass during April to June in 2004 probably was due to the drought and summer depression in grass-legume mixtures. Grass proportions decreased by 8.2% after 2 year, and white clover was dominated in grass-white clover mixture by May 2005. Crud protein (CP) content tends to increase with increased nitrogen application level.
고온성 초지의 예취관리 (刈取管理) 에 관한 연구 7 . 고온건조한 기상조건하에서 초장이 초지내 미기상환경 (微氣象環境) 과 목초재생 및 초지식생에 미치는 영향
서성(S . Seo),이종경(J . K . Lee),한영춘(Y . C . Han),박문수(M . S . Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.8
This experiment was carried out to determine the effects of grass heights during mid-summer season on the microenvironmental conditions, grass regrowth, summer depression and botanical composition in orchardgrass dominated pasture. Four different grass heights(I 8cm, 29(cm 39cm and 48cm) were maintained during high temperature and drought season. As the grass heights were increased the soil temperature and relative illumination were decreased, but relative humidity was increased. The lodging and dead matter of grasses were high in 48cm, followed by 39cm, 29cm and 18cm. Also lodging after rainfall increased remarkably. Eighteen cm of grass height showed low daily production, poor botanical composition and high summer depression index(2.17). Also the longer grass height, the lower contents of crude protein and crude ash, and he higher contents of crude fiber and NFE were observed. From above results, 29cm to 39cm could be recommended as the optimum grass height for minimizing summer depression under high temperature and drought summer condition.
사초용 유채의 수확시기와 품종이 수량과 품질에 미치는 영향
김동암(D . A . Kim),이종경(J . K . Lee),이성철(S . C . Lee),조무환(M . H . Jo),전우복(W . B . Chun) 한국축산학회 1990 한국축산학회지 Vol.32 No.9
This experiment was conducted to determine harvesting date and cultivar effect on the yield and quality of forage rape (Brassica napus Subsp. oleifera) in comparison with Cayuse oats (Avena sativa L.) at the Experimental Livestock Farm, Seoul National University, Suweon during 1983-1984. A split-plot design with three replicates was used with harvesting date as main plots and cultivar as subplots. Agronomic characteristics, forage yield and quality measurements were taken in the experiment. Ramon, Velox, Barsica and Viva cultivars were classified as an early growing rape according to the plant height and maturity. Mean dry matter yield of forage rape and oats harvested at the late date was significantly higher than that of those crops harvested at the early date. In 1983. the dry matter yield of Ramon was highest at the early harvest, but Velox and Ramon were highest at the late harvest. In 1984, Ramon gave the highest dry matter yield at the early harvest, but Velox and Viva showed the highest at the late harvest. Mean dry matter yield of rape cultivar was higher than that of oats at the both harvesting dates. The crude protein concentration and in vitro dry matter digestibility(IVDMD) of rape showed a sligt decrease at the late harvest compared with the early harvest, but a marked decrease was found in oats at the late harvest. The nitrate concentration of rape was very variable between the cultivars at the both harvesting dates and no clear trend was detectable. Results indicate that the higher yield potential and the higher IVDMD of rape in comparison with oats warrant consideration of rape for use a supplemental autumn forage in Korea.
초지의 관개효과에 관한 연구 6 . 관개와 질소시비수준이 계절별 , 생육시기별 목초의 건물생산과 질산태질소 함량 및 관개효율에 미치는 영향
서성(S . Seo),이종경(J . K . Lee),이성철(S . C . Lee),박문수(M . S . Park) 한국축산학회 1990 한국축산학회지 Vol.32 No.3
For basic understanding on pasture irrigation, an experiment was conducted to determine the effects of irrigation and nitrogen(N) fertilization (200 and 400kg ha^-1 y^-1) on the seasonal grass dry matter (DM) production, nitrate nitrogen(N0₃-N) concentration, and irrigation efficiency in pasture mixtures dominated by orchardgrass, 1988. It was investigated on 7, 14, 21, and 28 days after harvesting in spring(May), summer(July) and autumn (Sept.), respectively. During experimental period, rainfall was controlled artificially, and irrigation point was ca. 1.0 bar. Higher DM production was observed in spring (1967 kg ha^-1), irrigated plot, and higher N fertilization plot, respectively. Also the DM production was increased with advancing maturity of plants. Irrigation efficiency in spring (20kg ha^-1 mm^-1) was significantly higher than summer(9kg), especially in high N fertilization plot. On the other hand, the efficiency in summer season was high in low N plot. NO₃-N concentration in spring was very low (less than 0.1%), however, the N0₃-N was high (more than 0.2%) in summer and autumn. Also the NO₃-N was increased remarkably with increasing of N level, and decreased slightly with advancing of plant growth. Based on the results, it is suggested that higher N in spring, and lower N fertilization in summer and autumn are more effective for grass production and irrigation efficiency. Also enough regrowth period is desirable to decline N0₃-N in summer and autumn.