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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.
하고기간중 규산질비료의 시용이 목초의 생육과 수량 및 사료가치에 미치는 영향
서성(S . Seo),이종경(J . K . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.1
This experiment was carried out to determine the effects of additional application of silicate fertilizer during summer season on growth, dry matter (DM) yield and nutritive value, and to obtain basic understanding on diminishing of summer depression of grasses. Application date (June 30 and Julv 15) and application amount (0. 150, 300 and 450 kg/ha) in Experiment 1, and application amount (0, 200, 400 and 800 kg ha) of silicate fertilizer m Experiment 2 were treated in existing pasture mixtures dominated by orchardgrass, 1988 and 1989. Grass growth, DM yield, lodging, neutral detergent fiber, acid detergent fiber, hemicellulose, water soluble carbohydrate and DM digestibility were not significantly influenced by application date and application amount of silicate fertilizer. In this experiment. therefore, there was no diminishing effect of summer depression by application of silicate fertilizer. However. performance of continuous research may be desirable in hill pasture with low soil fertility and bad soil conditions.
초지의 관개효과에 관한 연구 2 . 관개와 질소시비수준이 목초의 품질과 질산태 질소함량에 미치는 영향
서성(S . Seo),이종경(J . K . Lee),한영춘(Y . C . Han),조무환(M . H . Jo),박문수(M . S . Park) 한국축산학회 1988 한국축산학회지 Vol.30 No.8
A field experiment was carried out to determine the effects of irrigation and nitrogen (N) fertilization on the quality and feeding value of grasses during the dry season. In this study proximate components, mineral contents, cell wall constituents (CWC), water soluble carbohydrates (WSC), digestibility and nitrate N (NO₃-N) concentration of grasses were measured. Irrigation point was 0.5 bar, irrigation method of irrigated plot was sprinkler system, and N levels as a subplot were 140, 280 and 420 ㎏ ㏊^(-1). The experiment was performed at Livestock Experiment Station in Suwon during 1985-1986. The results are summarized as follows: 1. In proximate components, the content of crude fiber and crude ash were tended to be increased with irrigation, while that of NFE was tended to be decreased. Crude protein and crude fat were significantly (p$lt;0.05) increased with increasing level of N. 2. Mineral contents were not influenced by irrigation and N fertilization, but the content of K was tended to be increased with irrigation. 3. With irrigation the content of NDF was significantly (p$lt;0.05) increased, and those of ADF, hemicellulose, cellulose and silica were tended to be increased. The content of silica was significantly (p$lt;0.05) decreased, and that of crude fiber was tended to be decreased with higher N level. 4. The content of WSC was significantly (p$lt;0.05) decreased by irrigation and higher N level And the WSC content of summer season was remarkably lower than that of spring season. The digestibility was not influenced by irrigation and N fertilization level 5. NO₃-N concentration of grasses was tended to be increased with irrigation, and NO₃-N was significantly (p$lt;0.05) increased with increasing level of N. Also the NO₃-N content of summer season was remarkably higher than that of spring season. However, the NO₃-N content in this experiment was less than 0.1%, indicating that grasses was safe from nitrate poisoning to animals. 6. To improve the effects of pasture irrigation, therefore, intensive management with 50% increase at N fertilization rate (420㎏ ㏊^(-1)) over standard level is desirable for better grass production.
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.