• 한국작물학회지
• /
• 제45권3호
• /
• pp.167-170
• /
• 2000

기후가 냉량하고 토양의 유실이 많은 고랭지의 성토한 포장에서 관행구, 화학성개량구, 제오라이트구 등 3개처리를 하여 감자를 재배한 결과 감자생육 및 토양특성 변화는 다음과 같다. 1. 성토재료는 양질사토로서 유기물과 인산함량 등 토양의 이화학성이 낮았다. 2. 감자생육은 제오라이트구에서 가장 좋았으며 수량도 관행구에 비하여 3.7% 증수되었으나 전국 평균수량에는 미치지 못하였다. 3. 감자 괴경의 비대솔은 파종후 60-70일후에는 증가율이 감소되는데 수확시까지 제오라이트 처리구의 괴경비대율이 비교적 컸다. 4. 감자수확수 토양의 유기물과 인산함량은 시험전에 비해 크게 증가하였으며 처리구별로는 제오라이트 처리구가 컸다.

• 한국농공학회지
• /
• 제20권2호
• /
• pp.4688-4694
• /
• 1978

The result which I tried to get double crops of potatoes on the wet paddy fields through the underdrainage of P V.C pipe from March 1977 to June 1977 in Jung cheon-Ri, Jinseong-men, Jinyang gun, Kungsangnamdo are followings.1. During this experimental period, the temperature on the average was 15.67$^{\circ}C$ (yearly mean 14.78$^{\circ}C$ that was suitable in growing potatoes, while the amount of rainfall was not much heavier from middle of April to early in May. Therefore the yield of potatoes in the wet fields was so high. 2. The soil temperature of the treated plot in the underground of 10cm, 30cm, 60cm, 80cm, has risen to 1.38$^{\circ}C$, 1.32$^{\circ}C$, 1.45$^{\circ}C$, 1.28$^{\circ}C$, comparing to the soil temperature in the control plot respectively. 3. The discharge from subdrainage pipes was 0.6751/sec/ha on the average. 4. The treated plot showed better growth than the control plot, and the yield has been increased 424.8%, while they have been preserved to be voluntary from the level of "t" test.

• Asian-Australasian Journal of Animal Sciences
• /
• 제12권6호
• /
• pp.891-894
• /
• 1999

A field experiment was conducted with Calliandra calothyrsus of fifteen provenances to evaluate the variation in the condensed tannin content of fresh leaves. Plants were raised in a nursery for three months and planted in the field. Experimental design was line planting of double hedgerows (3 m long plot, 1/2 meter interval, 45 plants in each plot) with 5 replicates. Plants were lopped every 5 months and samples (10 different plants within a plot; 4 newly flushed leaves, 4 partially expanded leaves and 4 mature full expanded leaves from each of 10 trees in a plot) were collected and were put on ice before transfer to the laboratory. Proanthocyanidine was extracted in aqueous acetone, and total extractable proanthcyanidine (TEPA) and total proanthocyanidine (TOPA) were measured. In addition, proximate analyses were made of different provenances. Crude protein contents varied from 19.74% to 16.45%; in vitro organic matter digestibility ranged from 36.09% to 23.32%. TEPA content ranged from 11.22 to 16.01 (measured as absorbance at $550nm,\;g^{-1}$ DM) and TOPA from 24.57 to 31.72 (measured as absorbance at $550nm,\;g^{-1}$ DM) TEPA and TOPA had a positive correlation, whereas crude protein content of Calliandra was negatively correlated with TEPA and TOPA. Provenances, such as Georgesville (Belize), local, Coban (Guatemala), Patulul (Guatemala), Bombana (Mexico) can be selected on the basis of nutritive value of fodder.

• 농촌계획
• /
• 제8권1호
• /
• pp.69-76
• /
• 2002

A study was carried out to investigate the losses of sediment at a paddy plot located at the southern Korea. The observed amount of precipitation, irrigation, runoff fer the experimental paddy plot during the cropping period were 1,030, 566, and 701 mm in 1999 and 1,214, 413, and 710 mm in 2000, respectively. The observed sediment losses from the plot during cropping period were 1,221.3 kg $ha^{-1}$ in 1999 and 1,274 kg/ha kg $ha^{-1}$ in 2000, respectively.

• 한국초지조사료학회지
• /
• 제12권2호
• /
• pp.98-103
• /
• 1992

With a purpose of finding out the effects of cattle slurry application on thc nutrient contents of herbages and energy productivity in grassland, a field experiment was conducted with two times and five levels of cattle slurry application. The experimental field was designed in a split-plot with threc replications, and lasted from September, 1986 to October, 1990 at the Livestock Experiment Station in Suweon, The results obtained are summarized as follows: 1. The net energy(NEL, StE and TDN) contents of grasses in the plots with cattle slurry application just after cutting were slightly higher when compared to manuring 15 days after cutting. but DCP content has reverse trend. 2. Average net energy(NEL. StE and TDN) and DCP production of the plot with cattle slurry application 15 days after cutting were insignificantly increased by 26 % than those of manuring just after cutting. The energy and DCP yields in the plot with cattle slurry and with slurry + mineral fertilizer were decreased by 21 -27 % and 8- 11 %, respectively than those of the plot with single dressing of mineral fertilizer. 3. Mineral contents of grasses were not significant difference among the treatments of cattle slurry. but considering nutrient balance of animals, application of cattle slurry of 30-$60m^3$/ha with mineral fertilizer was profitable as compared to the other treatments.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2017년도 9th Asian Crop Science Association conference
• /
• pp.201-201
• /
• 2017

Delayed stem senescence of soybean is a phenomenon of retarded leaf and stem yellowing, where plants maintain a high stem water content and remain chlorophyll in leaf and stem at maturity stage. This phenomenon was one of the most important physiological disease in Japanese soybean cultivation. The occurrence of delayed stem senescence was affected by sowing time. And the most of Japanese field, soybean seeds were sowed in June. June is the rainy season in Japan, and the soil water content of field become higher in this season. In this study, the effects of late sowing (July sowing) on the yield and the occurrence of delayed stem senescence in soybean cultivars Enrei, Tachinagaha and Ayakogane were examined from 2013 to 2015, in the experimental farm at Nihon University (Fujisawa-city, Kanagawa, Japan). The seeds of all cultivars were sowed in June (June-normal density plot) or July (July-normal density plot, July-high density plot and July-super high density plot) in field experiment. The pot experiments were carried out in 2014. In all cultivars, the yield of July-high density plot and July-super high density were higher than that of June normal density plot. And the yield of June-normal density plot was the same as that of July-normal density plot. In all cultivars, the occurrence of delayed stem senescence was increased by seeding in June sowing. And in July sowing plots, no significance difference in the occurrence of delayed stem senescence was observed among density plots. One of reason about the increasing the occurrence of delayed stem senescence in June-normal plot was the increasing of the damaged seeds by bean bugs. Add one of reason about the decreasing of the occurrence of delayed stem senescence of July plots was the decreasing of the amount of cytokinin supplied from root to top and water stress after the flowering time was improved compared with the June plot. In conclusion, the yield of Enrei, Tachinagaha and Ayakogane were not changed by changing the sowing time from June to July. In all cultivars, the occurrence of delayed stem senescence were decreasing by seeding in July.

• 생물환경조절학회지
• /
• 제14권1호
• /
• pp.46-51
• /
• 2005

참외 정식 생력화 및 기계화 정식을 위한 기초자료로 활용코자 금싸라기은천 참외에 신토좌 호박을 호접하여 9cm폿트에 45일간 육묘하여 1월 16일 정식하였다. 정식 깊이는 모종을 폿트에서 뽑아 땅에 올려놓는 0cm깊이 정식구, 모종을 폿트 높이의 1/2만 묻는 4.5cm 깊이 정식구, 폿트 높이까지만 묻는 9cm 깊이 정식구(표준), 폿트 높이보다 깊게 묻는 12cm 깊이 정식구로 나누어 비교하였다. 1월 18일부터 19일까지의 터널 최저온도는 $9.3^{\circ}C$, 최고온도는 $41.2^{\circ}C$이었으며 습도는 $59\~99\%$이었다 정식 후 활착은 정식깊이가 깊을수록 빨랐으나, 정식 40일 후의 생육은 0cm 처리구를 제외한 4.5cm, 9cm, 12cm 깊이 정식구간에는 처리간 차이가 없었다 과중은 4.5cm 깊이 정식구에서 가장 무거웠고 과육두께와 당도는 처리간 차이가 없었다. 정식 깊이가 깊을수록 발효과율이 증가하였고 상품과율은 감소하였다. 10a당 상품수량은 9cm 깊이 정식구의 2,361kg에 비하여 0cm 처리구에서는 $2\%$, 4.5cm 처리구에서는 $1\%$ 증가하였으나 12cm 처리구에서는 $11\%$ 감소하였다.

• 한국수산과학회지
• /
• 제48권2호
• /
• pp.193-199
• /
• 2015

We observed that the growth and physiological change in Haliotis discus discus by low-dose irradiation with gamma ray.Irradiation with gamma ray was undertaken by using the low-level irradiation facility ($^{60}CO$) in cooperation with the Institute of Nuclear Science and Technology at Jeju National University. The parent abalones were attached one by one and then fixed by using the rubber band to the front side of the fabricated case for irradiation with gamma ray. The experimental plots of irradiation with gamma ray were set as 10, 15, 20 and 25 Gy and the 25 female abalones and 10 male abalones were utilized for each experimental plot. The sperms and eggs were fertilized by setting an interval for each dose to prevent mixing with other experimental plots when fertilizing the sperms and eggs for each dose of irradiation with gamma ray. As for the fertility, it was confirmed to be 85% the control and 10 Gy groups, whereas it was found to be 80%, 65% and 50% in the 15 Gy, 20 Gy and 25 Gy groups, respectively. As a conclusion, the hatching rate and attachment rate were higher at 10 and 15 Gy than the other experimental plots, and the growth rate was higher at 20 Gy than the other experimental plots. Also the changes in lysozyme activity in accordance with the stress of water temperature were found to have a significant increase in the other experimental plots as compared with the control plot at the end of 0 h. The changes in lysozyme activity have remained constant in all the experimental plots at the end of 12 h. These results allowed us to confirm that lysozyme was undertaking the biodefense action by reacting sensitively to the stress of water temperature in the control experimental plot. As for the other experimental plots, they are believed to avoid the biodefense mechanism due to the high degree of anti-parasite mechanism and anti-viral mechanism. Thus, it is believed that it would be imperative to conduct development and research on breeds that were potent for environmental tolerance by applying the method of irradiation with gamma ray to other marine animals and plants.

• 아시안잔디학회지
• /
• 제15권2호
• /
• pp.65-76
• /
• 2001

잔디(Zoysia japonica)의 1차 생산성과 광조건과의 상호작용을 평가하고 생리생태학적인 특성을 규명하기 위하여 일조시간을 조절한 상태에서 인공군락의 물질생산과 성장해석에 미치는 영향에 대하여 분석하였다. 그 결과의 요약은 다음과 같이 하였다. 1. RGR은 각 시험구공히 이식 후 20일경까지의 생장과정에서 높게 나타났고 이후 생장이 진행됨에 따라 낮아지는 경향을 보였다. 최고치는 Control에서 이식 후 20일과 20일사이의 생장과정에서 2.13g/g.10-days로 나타났으며 광조사 시간이 짧을수록 이식 후 초기생장부터 현저히 낮은 치를 보였으며 짧은 시간 자연광 조사가 RGR을 현저히 저하시키는 결과를 보였다. 2. NAR은 3시간 광조사구를 제외한 각구 공히이식 후 초기 생장과정에서 높은 치를 보였고, 이후 생장이 진행됨에 따라 낮은 치를 나타내었으며 최고치는 Control구에서 35g/$m^2$ 10days로 나타났다. 광조사 시간이 짧은수록 현저히 낮은 치를 보였으며 특히 3시간 광조사구에서는 초기생장부터 현저히 낮은 치를 나타내었고 변화도 감소하였다. LAI와는 역상관, RGR과는 정의 상관관계를 나타내었다. 3. LAR은 Control구와 각 일조시간 조절구에서는 광조사 시간이 짧을수록 이식초기부터 현저히 높은 LAR치를 보였고, 특히 3시간 광조사구에서는 현저히 높은 치를 보였으나 생장과정에 따른 증가율은 낮게 나타났다. LAR은 RGR과 NAR에 대하여 역의 상관관계를 나타내었다. 4. CGR은 각구 공히 이식 후 50일까지는 생장이 진행됨에 따라 증가하였고 이후의 생장과정에서는 낮아지는 경향을 보였으며 최고치는 1.56g/$ extrm{cm}^2$10days로 Control구에서 이식 후 60일경에 나타났다. LAI와는 정의 상관을 나타내었고 최적엽면적지수 Control구와 9시간, 7시간, 5시간 및 3시간, 일조시간 조절구에서는 각각 1.87, 1.12, 0.83, 0.18로 나타났다.

• 한국응용곤충학회지
• /
• 제17권2호
• /
• pp.105-113
• /
• 1978

본 실험은 솔잎혹파리의 성충우화수 조사기구를 개발하기 위하여 경기도 안양시 안양리 산 160번지와 수원시 서울대학교 농과대학에서 실시하여 다음과 같은 결과를 얻었다. 1. 솔잎혹파리의 우화기간은 5월 중순부터 8월중순이었고 우화최성기는 기구별로 차이가 있어 표준형은 5월 29일-6월 2일, Funnel-A형은 6월 3일-7일, Suction형 Trap은 6월 8일-12일간이었다. 2. 우화율은 실내실험구의 Funnel-A형에서 $41.06\%$였다. 3. Suction형 Trap은 밀도가 낮은 우화초기와 말기에 보호효과가 현저히 우수하였다. 4. 기존 표준우화상의 결점을 보완하기 위해 Funnel-A형과 Suction형 trap의 개발이 바람직하다.