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Yang, Chang-Hyu,Lee, Jang-Hee,Baek, Nan-Hyun,Shin, Pyeong,Cho, Kwang-Min,Lee, Sang-Bok,Lee, Gyeong-Bo 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.3
This study was carried out to investigate the incorporation effect of green manure crops (GMC) such as the hairy vetch on improvement of soil environment in reclaimed land during silage corn cultivation over the past two years. Plots consisted of conventional fertilization (CF) and incorporation of GMC were divided by addition rate of nitrogen fertilizer (100 kg $ha^{-1}$) with 30 - 100% of non nitrogen fertilization (NNF). Soil physico-chemical properties and growth and yield potential of silage corn were examined. The tested soils showed strong alkali and saline properties with low contents of organic matter and available phosphate while contents of exchangeable sodium and magnesium were high. Soil salinity increased during cultivation of summer crop. However, corn was not affected by salt content. The fresh weight of GMC at incorporation time was 18,345 kg $ha^{-1}$. Content of total nitrogen was 3.09% and the C/N ratio was 12.8 at incorporation time. Fresh and dry matter yield of silage corn were higher in the order of N30% reduction, CF, N50% reduction, N70% reduction, N100% reduction and NNF. Fresh and dry matter yield potential of silage corn for N30% reduction were comparable to those of CF. Bulk density of the soil decreased with incorporation of GMC, while porosity was increased. The soil pH decreased while content of exchangeable calcium, available phosphate, and organic matter increased. Also contents of exchangeable sodium and potassium decreased with incorporation of GMC. The data indicate that incorporation of hairy vetch can improve soil physical and chemical properties and reduce nitrogen fertilizer application especially for alkali saline reclaimed soil such as Saemangeum reclaimed land.
유기물 장기연용 논토양에서 질소수준에 따른 쌀 수량 및 미질 특성 변화
양창휴 ( Chang Hyu Yang ),류철현 ( Chul Hyun Yoo ),정지호 ( Ji Ho Jeong ),이상복 ( Sang Bok Lee ),백승화 ( Seung Hwa Baek ),이상욱 ( Sang Uk Lee ),김성조 ( Seong Jo Kim ) 원광대학교 생명자원과학연구소 2006 생명자원과학연구 Vol.28 No.-
This experiment was carried out to investigate the effect of soil environment and crop productivity in paddy soil with annual dressing of organic matter and NPK. Uptake amount of nitrogen in straw and grain was increased by application of organic matter and N use efficiency of rice plant was high in order of NPK + compost> NPK + straw> NPK. Content of nitrogen and magnesium in brown rice was increased by application of rice straw and compost and Mg/K, Mg/K·N ratio was the highest in NPK + compost. There were little difference in protein and amylose content in the milled rice among the treatments. On the while fat content was the highest in NPK + compost and TOYO palatability index was high in order of NPK + compost>NPK>NPK + straw. Application of organic matter caused to improve appearance characteristics of brown rice and milled rice, head rice ratio and perfect kernel ratio. But grain quality was deteriorated by non-application of organic matter because of high broken kernel and damaged kernel ratio. Yield of milled rice was increased in applying organic matter plot due to the increase number of panicles and spikelets per m2.
VDT작업이 안 조절반응과 동공 대광반사에 미치는 영향
김은아,김양호,진영우,채창호,최용휴,문영한,Kim, Eun-A,Kim, Yang-Ho,Jin, Young-Woo,Chai, Chang-Ho,Choi, Yong-Hyu,Moon, Young-Hahan 대한예방의학회 1997 예방의학회지 Vol.30 No.3
6명의 20대 여성을 대상으로 VDT작업으로 인한 조절반응 및 동공대광반사의 작업부과에 따른 변화와 다른 사무작업을 부과할 때와의 차이를 보았다. 그 결과 다음과 같은 결과를 얻었다. 1. VDT작업에서 작업부과 시간이 증가함에 따라 조절 수축속도가 감소했으며 1시간의 휴식시간 후에는 현저하게 증가했고 다시 작업을 부과함에 따라 감소하는 경향을 보였다. 조절 수축속도의 변화보다는 뚜렷하지 않지만 이완속도도 VDT작업부과에 따라 감소되고 휴식에 의한 회복되는 경향을 보였다. 2. 일반 사무작업과 근거리 사무작업에서는 조절 수축속도에서 VDT작업부과때와 같은 반응은 보이지 않았으며, 근거리 사무작업에서 이완속도가 작업부과에 따라 감소하였으나 휴식 후 회복되지 않았다. 3. 동공대광반사에서 최초동공직경, 최초동공면적은 VDT작업에서만 작업시간의 증가에 따라 유의한 감소를 보였는데 휴식 후 회복되지 않았다. 이러한 결과는 조절 수축속도의 변화, 조절 이완속도, 동공직경과 면적의 변화가 VDT작업의 특성을 연구하는데 사용될 가능성을 보여주며, 이를 위해서 연구대상이 개인차, 생체리듬, 감정적 자극 등을 보정한 연구가 필요하다고 생각된다. We studied on change of lens accommodation and pupil light reflex caused by VDT work in six women and compared them with those of other office works. The results were as follows. 1. In VDT work the accommodation contraction velocity decreased during the first 2-hr VDT task, then recovered markedly by the end of the one-hour lunch break, and decreased again by the end of the 2nd 2-hr VDT task. Changes of relaxation velocity showed similar pattern although it was less typical than that of contraction velocity 2. There was no marked change in accommodation contraction velocity and amplitude of accommodation in general office work and near-distance office work, and in the near-distance office work accommodation relaxation velocity decreased according to work load without recovery after lunch break. 3. Initial pupil diameter, initial pupil area of light reflex decreased significantly during VDT task only in VDT work and didn't recover after lunch break. These results suggest possibility that changes of accommodation contraction velocity, accommodation relaxation velocity, near point distance, and pupil diameter and area are useful in evaluating characteristics of VDT work. For this, more research adjusted individual differences, circadian rhythm, emotional stress needs.
Chang-Hyu Yang(양창휴),Taek-Kyum Kim(김택겸),Jin-Hee Ryu(유진희),Sang-Bog Lee(이상복),Sun Kim(김선),Nam-Hyun Baek(백남현),Weon-Young Choi(최원영),Doug-Young Chung(정덕영),Si-Ju Kim(김시주) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.6
본 연구는 논토양 비옥도에 대한 예취높이별 볏짚 혼입효과를 구명하고자 수행하였다. 예취높이별 잔존량은 1,420 kg ha<SUP>-1</SUP> (10 cm), 1,850 kg ha<SUP>-1</SUP> (15 cm), 2,400 kg ha<SUP>-1</SUP> (20 cm)를 나타냈다. 볏짚 혼입으로 토양경도, 용적밀도는 낮아졌고 공극 률이 증가하여 토양물리성이 개선되었다. 볏짚 수거로 토양유기물, 유효인산 및 유효규산 함량이 적어지고 양이온치환용량 이 낮아졌다. 토양에 볏짚 혼입시 비옥도 감소 폭이 적었고 예취높이별 잔존량이 많을수록 혼입효과가 크게 나타났다. 볏짚 혼입에 따라 수수, 영화수 확보가 많고 등숙비율이 높아졌으며 쌀수량은 관행 (3.67 Mg ha<SUP>-1</SUP>)대비 28~32% 증수되었다. 연구결과 예취방법에 의하여 볏짚을 혼입한 재배기술이 수거에 비하여 쌀수량을 증가시켰고 논토양을 개선하였다. This study was to investigate the effects of rice straw incorporation by cutting height on paddy soil fertility. The average residual amount of rice straw by cutting height were showed 1,420 kg ha<SUP>-1</SUP>, 1,850 kg ha<SUP>-1</SUP>, and 2,400 kg ha<SUP>-1</SUP> for depths of 10 cm, 15 cm, and 20 cm, respectively. For soil physical properties, soil hardness and bulk density were decreased while porosity was increased by rice straw incorporation. But soil organic matter (SOM), available silicate content, and cation exchange capacity (CEC) were significantly decreased when rice straw was removed from the field. These results indicated that the SOM as residual amount of rice straw was influenced by level of cutting height. Milled rice yield was increased by 28% and 32% for cutting heights of 15 cm and 20 cm, compared with that of control, respectively. The number of spikelets per square meter and the percentage of ripeness were increased with increasing incorporation by lower level of cutting height of rice straw. Therefore, incorporation of rice straw practices under cutting method influenced soil improvement and rice yield in paddy field.
Chang-Hyu Yang,Jang-Hee Lee,Nan-Hyun Baek,Pyeong Shin,Kwang-Min Cho,Sang-Bok Lee,Gyeong-Bo Lee 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.3
This study was carried out to investigate the incorporation effect of green manure crops (GMC) such as the hairy vetch on improvement of soil environment in reclaimed land during silage corn cultivation over the past two years. Plots consisted of conventional fertilization (CF) and incorporation of GMC were divided by addition rate of nitrogen fertilizer (100 kg ha<SUP>-1</SUP>) with 30 ? 100% of non nitrogen fertilization (NNF). Soil physico-chemical properties and growth and yield potential of silage corn were examined. The tested soils showed strong alkali and saline properties with low contents of organic matter and available phosphate while contents of exchangeable sodium and magnesium were high. Soil salinity increased during cultivation of summer crop. However, corn was not affected by salt content. The fresh weight of GMC at incorporation time was 18,345 kg ha<SUP>-1</SUP>. Content of total nitrogen was 3.09% and the C/N ratio was 12.8 at incorporation time. Fresh and dry matter yield of silage corn were higher in the order of N30% reduction, CF, N50% reduction, N70% reduction, N100% reduction and NNF. Fresh and dry matter yield potential of silage corn for N30% reduction were comparable to those of CF. Bulk density of the soil decreased with incorporation of GMC, while porosity was increased. The soil pH decreased while content of exchangeable calcium, available phosphate, and organic matter increased. Also contents of exchangeable sodium and potassium decreased with incorporation of GMC. The data indicate that incorporation of hairy vetch can improve soil physical and chemical properties and reduce nitrogen fertilizer application especially for alkali saline reclaimed soil such as Saemangeum reclaimed land.
Nitrogen Fertilization on the Growth of Rape (Brassica napus L.) in Newly Reclaimed Land in Korea
Yang, Chang-Hyu,Kim, Taek-Kyum,Kim, Sun,Baek, Nam-Hyun,Choi, Weon-Young,Lee, Jang-Hee,Jung, Jae-Hyeok,Lee, Yong-Hwa,Kim, Si-Ju,Lee, Kyeong-Bo Korean Society of Soil Science and Fertilizer 2011 한국토양비료학회지 Vol.44 No.4
This study was conducted to find out the optimum nitrogen application rate for the stable production of rape in the newly reclaimed land located at Gangwhal region of Saemangum reclaimed land in which the soil is sandy loam (Munpo series). There were five treatments of nitrogen fertilization from zero to 60% increment based on the standard fertilization of $150kg\;ha^{-1}$. The growth of rape (Sunmang) was not affected by salt content while soil salinity was increased at blossoming season of rape. Compared to yield of standard fertilization the yield and the content of oleic acid of rape were increased by 4~26% with the increasing additional nitrogen fertilizer. The results obtained from the growth and yield of rape in this study indicated that it was possible to cultivate rape in a newly reclaimed land if soil salinity was kept below $3dS\;m^{-1}$.