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훈련 받은 집단과 받지않은 집단간의 과학적 창의성 비교 연구 : 국민학교 4·5학년 중심으로
박재호,김학수,김현아,백남권 釜山大學校 師範大學 1996 교사교육연구 Vol.33 No.-
This study examined the possibility of development of scientific creativity by training, and put on an emphasis if there is any difference in scientific creativity depending on the gender and the grade. The subjects of study are 40 students who trained scientific creativity and 80 students of K elementary school in Pusan : insincerely answered students were excluded and the rest was random sampling according to the gender and the grade. As result of verification of average difference between the trained group of S.C and untrained, the trained group bring out meaningful difference about the flexibility, the fluency, and the originality in some of lower parts of scientific creativity. This proves that scientific creativity can be developed by training. There are no statistically significant difference between the trained group of scientific creativity and the untrained group each other about the distinction of the gender. It proves that scientific creativity is not based on the distinction of the gender. According to the grade, the average of scientific creativity shows that the 5th grade students in the trained group, and the same meaningful difference on the whole. But there is no difference depending on the grade.
Effects of Ditching on Seedling Stand in Wet Direct Seeding Rice Culture
Nam-Hyun Back,Si-Yong Kang,Sang-Su Kim,Tae-Oh Kwon 韓國作物學會 2001 Korean journal of crop science Vol.46 No.1
In order to develop more stable seedling stand method in wet direct rice seeding culture, the effect of making the drainage ditches was studied in both methods of broadcast seeding on floody paddy surface and puddled-soil drill seeding. In a broadcast seeding on floody paddy surface, the ditching after seeding using a tractor or small ditch maker improved the seedling stand, and reduced the floating seedling and herbicide injury by accelerating the drainage. Suitable ditching time was at 2 days after seeding (DAS) for the tractor and at 3 DAS for the ditch maker. In the puddled-soil drill rice seeding culture, the ditching before seeding with a ditch maker at 3 days after draining effectively improved the seedling stand due to quick draining through well formed the seeding furrows. In the puddled-soil drill seeding, seedling stand number showed higher in both ditching plots synchronized with seeding compared with both only draining treatment at 1 DAS without ditching and the flooding plot condition for 6 DAS. And the suitable ditching depth was 6 cm, as considered the ditching status and drained status. These results suggest that the ditching in wet direct rice seeding is an resonable practice for improving the seedling stand through the accelerating drainage of field.
Nam Hyun Back,Sang Su Kim,Si Yong Kang,Min Gyu Choi,Hyun Tak Shin,Tae Oh Kwon 韓國作物學會 1999 Korean journal of crop science Vol.44 No.3
Unstable seedling stand establishment of wet direct seeding culture of rice is one of the major elements preventing the extension of its culture area. In order to develop methods of seedling stand improvement in direct seeded rice on flooded surfaces, three field experiments were conducted on silty loam soil using a cultivar 'Donjinbyeo' for three years, mainly focusing on water management after seeding and seed soaking with plant growth regulators (PGRs). Under the condition of shallow flooding after seeding, seedling stand rate increased and floating seedling rate decreased in both early and normal season seeding compared to deep flooding. With earlier draining time after seeding, there was a tendency towards preferential growth of the seminal root, increase of seedling stand and decrease of the floating seedling rate. Therefore the highest seedling numbers per unit area and the lowest floating seedling numbers were found upon drainage at 1 day after seeding (DAS), while a contrary tendency was shown upon conventional drainage at 7 DAS. Seed soaking with PGRs such as Metalaxyl or mixing of Metalaxyl with gibberellic acid (GA3 ) significantly increased the seedling stand. In addition the effects of PGR treatment on seedling stand and the early growth of plants were greater under flooded conditions than under drained conditions after seeding, although draining of water after seeding improved the seedling establishment rate more when compared with the PGR treatment. These results suggest that draining management after seeding or maintaining of shallow flooding for a week is the most effective method to improve the seedling stand rate in wet direct seeding.
Effects of Ditching on Seedling Stand in Wet Direct Seeding Rice Culture
Back, Nam-Hyun,Kang, Si-Yong,Kim, Sang-Su,Kwon, Tae-Oh The Korean Society of Crop Science 2001 Korean journal of crop science Vol.46 No.1
In order to develop more stable seedling stand method in wet direct rice seeding culture, the effect of making the drainage ditches was studied in both methods of broadcast seeding on floody paddy surface and puddled-soil drill seeding. In a broadcast seeding on floody paddy surface, the ditching after seeding using a tractor or small ditch maker improved the seedling stand, and reduced the floating seedling and herbicide injury by accelerating the drainage. Suitable ditching time was at 2 days after seeding (DAS) for the tractor and at 3 DAS for the ditch maker. In the puddled-soil drill rice seeding culture, the ditching before seeding with a ditch maker at 3 days after draining effectively improved the seedling stand due to quick draining through well formed the seeding furrows. In the puddled-soil drill seeding, seedling stand number showed higher in both ditching plots synchronized with seeding compared with both only draining treatment at 1 DAS without ditching and the flooding plot condition for 6 DAS. And the suitable ditching depth was 6 cm, as considered the ditching status and drained status. These results suggest that the ditching in wet direct rice seeding is an resonable practice for improving the seedling stand through the accelerating drainage of field.
Back, Nam-Hyun,Kim, Sang-Su,Kang, Si-Yong,Choi, Min-Gyu,Shin, Hyun-Tak,Kwon, Tae-Oh The Korean Society of Crop Science 1999 Korean journal of crop science Vol.44 No.3
Unstable seedling stand establishment of wet direct seeding culture of rice is one of the major elements preventing the extension of its culture area. In order to develop methods of seedling stand improvement in direct seeded rice on flooded surfaces, three field experiments were conducted on silty loam soil using a cultivar 'Donjinbyeo' for three years, mainly focusing on water management after seeding and seed soaking with plant growth regulators (PGRs). Under the condition of shallow flooding after seeding, seedling stand rate increased and floating seedling rate decreased in both early and normal season seeding compared to deep flooding. With earlier draining time after seeding, there was a tendency towards preferential growth of the seminal root, increase of seedling stand and decrease of the floating seedling rate. Therefore the highest seedling numbers per unit area and the lowest floating seedling numbers were found upon drainage at 1 day after seeding (DAS), while a contrary tendency was shown upon conventional drainage at 7 DAS. Seed soaking with PGRs such as Metalaxyl or mixing of Metalaxyl with gibberellic acid (GA$_3$) significantly increased the seedling stand. In addition the effects of PGR treatment on seedling stand and the early growth of plants were greater under flooded conditions than under drained conditions after seeding, although draining of water after seeding improved the seedling establishment rate more when compared with the PGR treatment. These results suggest that draining management after seeding or maintaining of shallow flooding for a week is the most effective method to improve the seedling stand rate in wet direct seeding.
새만금 간척지에서 토양 염농도별 동계 사료작물의 생육 및 수량
백남현 ( Nam Hyun Back ),김택겸 ( Teak Kyum Kim ),양창휴 ( Chang Hyu Yang ),김선 ( Sun Kim ),남정권 ( Jeong Kwon Nam ),이상복 ( Sang Bok Lee ),최원영 ( Weon Young Choi ),김시주 ( Si Ju Kim ),이경보 ( Kyong Bo Lee ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.4
To examine the possibility of cultivation of winter fodder crops at Saemangeum reclaimed land, barley, rye, wheat, triticale, and oat were cultivated under the various ranges of saline soils from autumn 2009 to the spring 2011, and their growth and yields were evaluated. emergence and seedling stand rate were 84 and 79% at non-salinity soil plot, 64 to 73% at 0.2% saline soil plots, 40 to 52% at 0.3% saline soil plots, and 22 to 37% at 0.4% saline soil plot, respectively. those of rye, wheat, triticale, and barely were similar, however those of oats were relatively low. Yields of fresh and dry matter were 66 to 77% level at 0.2% saline soil plot and 30 to 61 % level at over 0.3% saline soil plots compared with the yields at non-saline soil plot. Fresh matter were high in order of rye>wheat>barely>triticale>oat. and dry matter were high in order of wheat>rye=barley>tricale>oat. Thus, considering these results, Soil salinity below 0.2% were available to cultivation of winter fodder corps and rye, wheat, barely and triticale were available crops in Saemangeum recalimed land.