• 한국작물학회지
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• 제36권2호
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• pp.143-146
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• 1991

남부지방에서 자소의 직파 재배시 적정 파종기를 구명하고자 시험을 실시한 결과는 다음과 같다. 1 출현은 자소의 파종기가 빠를수록 늦어지고 늦어질수록 단축되는 경향으로 출현일수와 파종기간에는 고도의 부의 상관이 인정되었다. 2 생육은 4월 1일 파종이 경장과 경직경이 크고 분지수와 수수가 많아서 가장 양호한 경향이었다. 3 건경엽 수량은 4월 1일 파종이 경장이 크고 분지수가 많아 지상부의 생육이 양호하여 증수되었으며, 종실수량도 수당삭수와 수수가 많아 증수되는 경향이었다. 이상과 같은 결과로 보아 4월 1일 파종이 생육이 양호하여 경엽과 종실수량이 증가되어 남부지방의 알맞는 파종기로 생각된다.

• 한국약용작물학회지
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• 제18권2호
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• pp.70-73
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• 2010

This study was carried out to clarify the difference of growth characteristics and ginsenoside content in 5-year-old ginseng root grown by direct seeding and transplanting cultivation. Root weight per plant of direct seeding cultivation was lower than that of transplanting cultivation. Fresh and dry matter partitioning ratio of direct seeding cultivation was high in main root and low in lateral because direct seeding cultivation root elongated the length of main root, while it suppressed the growth of lateral root. Total amount of ginsenoside contents by direct seeding and transplanting cultivation were 362.8 and 320.3 mg in main root, 188.6 and 548.8 mg in lateral root, 170.7 and 273.8 mg in fine root. Its contents of whole root per plant were 722.1 and 1142.9 mg by direct seeding and transplanting, respectively.

• 한국작물학회지
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• 제42권6호
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• pp.752-758
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• 1997

본 실험은 건답직파재배에서 전체 시비량의 50％를 차지하는 기비의 양을 줄이므로 인해 나타나는 토양내 질소의 농도변화를 알아보기 위하여 기비의 시용량을 이앙재배의 일반적인 시비량인 70kg-N/10a에 대해 75％, 50％, 25％, 무시용구로 하여 각각의 토양 내의 암모니아태 질소, 질산태 질소의 처리 후 농도변화를 조사하였고 그 결과는 다음과 같았다. 1. 암모니아태 질소의 농도는 전체 시비량 140kg-N/ha의 50％를 기비로 시용한 처리구에 대해 75％, 50％, 25％, 0％의 수준으로 절비처리한 토양에서 기비의 시용량이 적을수록, 토심이 깊어질수록 낮아졌으며, 기비처리 후 27일이 경과한 후로는 모든 처리구에서 처리 전과 비슷한 양의 농도를 보였다. 2. 질산태 질소의 농도 또한 기비시용량이 적을수록, 토심이 깊어질수록 낮았다. 기비처리 후 27일 후에는 기비를 70kg-N/ha의 수준으로 시비한 토양에서는 기비를 주지 않은 토양보다 5배 정도 많은 양이 잔존하고 있었으며, 나머지 처리구는 처리 전의 농도보다는 다소 높았지만 처리 후 초기보다는 많은 양이 감소하였다. 3. Pot 실험을 통해 담수상태에서의 질산태 질소의 용탈량을 조사한 결과 시비 14일 후에는 질소시비량에 관계없이 거의 모든 양이 용탈되었다. (감수심≒20mm /일) 4. 40∼50cm 깊이의 토양에 존재하는 암모니아의 농도와 질산의 농도를 누적시킨 결과를 통해 시비처리한 비료의 대부분은 중력수와 함께 계속해서 하향이동하는 것으로 보여지며 이들은 대부분 그대로 용탈된 것으로 보여진다.

• 한국초지조사료학회지
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• 제14권1호
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• pp.7-12
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• 1994

This study was undertaken to evaluate the effect of legume reseeding on legume establishment, dry matter yield, quality and botanical composition of grasses in timothy(Ph1eum prarense L.) dominated pasture at alpine area. Establishment number and percentage of legume in timothy dominated pasture were increased with spring, red clover(Tr$olium pratense L.) and gramoxone $treatment Dry matter yield of pasture was increased with fall and grazing after overseeding, but, there waq no difference in legume species. Crude protein content(%) of grasses at the first cutting was increased with red clover and paraquat (gramoxone) treatment. Based on the results, it is suggested that spring in seeding time, red clover in legume species and oveneeding after gramoxone treatment are good for effective renovation of timothy dominated pasture at alpine area.

• 생명과학회지
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• 제11권2호
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• pp.166-172
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• 2001

Various types of the seeding of bottle gourd widely used as a rootstock of watermelon has been required to satisfy the farmers need. The study was done to determine the effect of light quality of blue, red and far-red lights treated with light emitting diodes on growth and morphology of bottle goured seeding and chlorophyll content of its cotyledons. The lights were treated in the growth chamber for 7 days to the seeding elapsed 8 days after sowing under natural condition, and 64 hole trays with commercial bedsoil. Plant height, length and diameter of hypocotyl, leaf area of cotyledon and first true leaf, its leaf length, number of true leaves, fraction and total dry weight were measured. Red light shortened and slenderized the hypocotyl, which lengthened by far-red light and thickened by blue light. Plant height was declined in order of far-red light treatment, blue and red lights mainly due to difference of hypocotyl length, Area and length of the first true leaf became smaller and shorter under far-red light than under the other lights. However, blue light increased leaf area of cotyledons. Two cultivars cv. Yongjadaemok and cv. Kunghap had different response to the light treatments in total seedling dry weight(dw); far-red and red light treatments showed the greatest and the least dw of hypocotyl, respectively, while blue and red lights did the greatest dw of the other organs. Among the ratio of each organ dw to total dw, those of hypocotyl and true leaves were different between the light treatments; the highest ratio of hypocotyl dw to total dw was observed in far-red light treatment but the lowest was in red light treatment. Those of the true leaves were the lowest in far-red light and similar response in blue or red light treatment. Chlorophyll content of cotyledons was decreased in order of red light treatment, blue and far-red lights, meaning that short period light treatment may influence photosynthesis of seeding and afterward its growth.

• 한국초지조사료학회지
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• 제14권4호
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• pp.316-323
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• 1994

In order to reduce the problems from the presence of rye crop residues in maize establishment and yield, and also to improve the growth, productivity and nutritive value of rye(Seca1e cereal L.). an experiment was canied out to determine the variety effect of rye on the forage production system and the eft'ect of seeding and harvesting dates on the production and quality of rye. 'This experiment was conducted at the forage testing field of S.N.U., Suweon, from September 1986 to May 1989. Heading date of an early maturing rye variety, Wintermore. was earlier 10 days than that of a late maturing rye variety, Kodiak. A 15-days delay in the seeding dates of early and late maturing varieties of rye tended to delay the heading dates of the rye varieties for 3 and 4 days, respectively. Dry matter and in vitro digestible dry matter yields were markedly increased with earlier seeding date. Before 20 April, the DM and IVDDM yeilds of an early maturing rye variety, Winterrnore. were higher than those of a late maturing rye variety, Kodiak. However, no such a trend was found between the early and late maturing varieties of rye after 27 April. Less than 35% of ADF was recorded until the harvesting dates of 13 and 27 p r i l for early and late maturing rye varieties, respectively, but less than 46% of NDF was maintained until the harvesting drtte of 13 April for botg varieties. Based on the results obtained from this experiment. it may be concluded that the most desirable forage production from corn-rye double cropping system is to advance the seeding time of rye toward the first 10 days of September as well as harvesting time toward the first heading stage with an early maturing rye variety.

• Journal of Animal Science and Technology
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• 제63권5호
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• pp.1098-1113
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• 2021

Maturation process of alfalfa (Medicago sativa L.) could be prevented by the reduction of lignin content in terms of conventional breeding or transgenic technology. Alfalfa could exhibit higher leaf/stem ratio, with a concern of yield loss. The objective of this study was to compare forage yield and nutritive value of low lignin alfalfa and two reference varieties subjecting to two harvest intervals and three seeding rates. The experimental design was a randomized complete block in a split-split plot arrangement with four replicates, where harvest intervals (28-day and 35-day) were assigned to whole plots, seeding rates were subplots, and varieties were sub-subplots. The weighted mean nutritive value was applied to two production years of 2016 and 2017. Hi-Gest 360 (low lignin alfalfa) provided similar yield potential and increased nutritive value compared to two reference varieties. Over a two-year production period, alfalfa harvested at every 28-day interval provided more economic returns than those at 35-day interval. For the seeding year and first production year, five cuts made by the 28-day interval produced more yield than four cuts by the 35-day interval. Due to limited rainfall in May 2017, a sharp drop of the first cutting overturned the advantage of the five-cut system. Shorter intervals between harvests generally increased crude protein (CP) concentrations. The differences of relative feed value (RFV) between two harvest intervals tended to be great during the first and second cuttings. Overall, harvest interval had a large effect on nutritive value and a more significant effect on alfalfa dry matter yield than variety selection. Seeding rate did not affect alfalfa yield and nutritive value.

• 한국농림기상학회지
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• 제20권1호
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• pp.18-33
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• 2018

기후스마트농업의 관점에서 무논점파 농법의 경쟁력을 평가하기 위하여 플럭스 타워(HPK)를 설치, 에디 공분산 방법으로 이산화탄소, 메탄 그리고 에너지의 교환량을 지속적으로 관측하고 있다. 본 통신문에서는 HPK 관측지에 대한 소개와 관측 자료의 처리과정 및 품질 관리에 대하여 문서화 하였다. KoFlux 표준화 방법에 따른 10단계 자료 처리 및 품질 관리과정을 거쳤으며, 이 과정에서 HPK 관측지의 자료 사용자들이 알아야 할 중요한 보정 단계를 이해하기 쉽도록 각 방법에 대한 개념과 일반적인 예를 들어 설명하였다. 자료 처리 과정에서 생성된 모든 자료들을 정리하여 데이터 서버에 저장하였으며, 모든 처리 과정을 거친 최종 자료를 사용하여 HPK 관측지에서 2016년 생장기간 동안 관측된 주 요소들에 대해 간략히 정량화 하였다.

• 농업과학연구
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• 제46권1호
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• pp.151-161
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• 2019

Ashwagandha (Withania sominifera Duanal) is an important medicinal herb with increased demand after discovering its anti-stress and sex stimulating properties that are attributed to the presence of biologically active alkaloid compounds. The aim of this study was to elucidate a proper agro technological package that ensures the optimum growth of Ashwagandha to obtain the finest quality without degrading the pharmacologically active constituents. Mixtures of organic and inorganic fertilizers were combined with direct seeding and transplanted as four different treatments in this study. The fresh and dry weights of the tubers were recorded up to 12 months starting from two months after sowing (MAS) while the shoot height, root length, number of leaves, fresh and dry weights of the shoot and the root with a shoot ratio of up to 6 MAS were determined. The results revealed that the growth of Ashwagandha was not affected significantly by the method of planting, type of fertilizer or their combinations during most of the harvests. However, tubers harvested at 6 MAS had the highest recorded dry tuber weight per plant in all four treatments compared to the early harvests where two direct seeded treatments had the best results. Comparison of the phytochemical compounds showed that direct seeding with organic fertilizer had the highest recorded values for alkaloid and withaferine A contents with a lower percentage of fiber compared to the treatments with inorganic fertilizer. In conclusion, direct seeding with organic fertilizer and tubers harvested at 6 MAS are recommended as the best cultivation conditions and harvesting stage to obtain high quality tubers of Ashwagandha, respectively.

• 한국작물학회지
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• 제50권2호
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• pp.73-78
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• 2005

Demand for the domestic hairy vetch seed production will be increased with the increasing interest of environment-friendly agriculture in Korea. This study was conducted during from 2000 fall to 2003 spring at upland field of National Institute of Crop Science in Suwon, Korea to compare wheat and triticale (TC) as stake crop of hairy vetch (HV), and to know proper seeding rates and ratios between TC and HV for the maximum HV seed production. As supporting crop of HV, TC was superior to wheat at the points of higher HV seed yield, stronger TC stalk for supporting, consistence of ripening stage of two seeds. In seeding method, row seeding was superior to broadcast seeding at the points of less lodging and higher HV seed yield. HV seed yield decreased with the increase of TC seeding rate in mixture cropping (row seeding), particularly at TC seeding rates over 5kg/10a. HV seed yield increased with the increase of HV seeding rate at the condition of TC seeding rates under 5kg/10a in spite of higher lodging of mixed crops at higher HV seeding rate due to higher HV aboveground dry matter. Maximum HV seed yield was obtained at TC seeding rate of $1\~1.5kg/10a$ as indicating HV seed yield 176kg/l0a (CV. Madison) at seeding rate of TC 1kg/10a + HV 2 kg/10a in 2001, and HV seed yield 96kg/10a (CV. Common) at seeding rate of TC 1.5kg/10a + HV 4.5kg/10a in 2003. Use of all-purpose combine harvester for harvesting and appliance for separation of mixed seeds using centrifugal force, which are prerequisite for HV seed production, was excellent in the simultaneous seeds production system of HV and TC.