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돈분액비 시용이 동,하계 사료작물의 수량 및 토양의 화학적 특성에 미치는 영향
조광민 ( Kwang Min Cho ),이상복 ( Sang Bok Lee ),백남현 ( Nam Hyun Back ),양창휴 ( Chang Hyu Yang ),신평 ( Pyung Shin ),이경보 ( Kyeong Bo Lee ),박기훈 ( Ki Hoon Park ),백승화 ( Seung Hwa Baek ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.4
BACKGROUND: Liquid pig manure (LPM) is a useful resource if it is sufficiently fermented and utilized in the agriculture; it provides nutrients to soils, circulates organic materials and replaces chemical fertilizers(CF) with reasonable costs. Currently, there are not many trials in paddy field to continuously cultivate the crops in winter and summer season using LPM. METHODS AND RESULTS: When cultivating winter forage crops (Whole-crop-barley(WCB), Rye, Triticale, Italian ryegrass(IRG)) and summer feed corns in the rice field, CF was treated with N-P2O5-K2O(winter forage crops: 120-100-100kg/ha, summer feed corn: 200-150-150 kg/ha), and subsequently, growth, yields, feed values and chemical properties of soil were investigated. LPM-applied areas in both winter and summer forage crops showed higher plant lengths and tillers than those of CF-applied areas, but the yield in CF-applied areas was higher than that of LPM-applied areas under continuous application of 2 years. Crude protein, neutral detergent fiber(NDF), acid detergent fiber(ADF) and total digestion nutrient(TDN) in feed values showed almost similar results between LPM and CF-applied areas. EC, organic matter, available phosphate and exchangeable cations of soils after the experiment increased in LPM applied areas, and especially, the contents of available phosphate and exchangeable sodium were high. CONCLUSION(S): Considering the above results, it was concluded that if LPM are properly utilized for continuous winter and summer cultivation of feed crops at paddy field, the cultivation costs could be decreased and be helpful to the stable production of domestic feeds.\
양창휴(Chang-Hyu Yang),김선(Sun Kim),이장희(Jang-Hee Lee),백남현(Nam-Hyun Baek),김택겸(Taek-Kyum Kim),최원영(Weon-Young Choi),정재혁(Jae-Hyuk Jeong),이상복(Sang-Bok Lee),이경보(Gyeong-Bo Lee) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.2
본 연구는 새만금간척지 (광활지구) 신간척지에서 조사료의 안정생산을 위하여 사료작물 재배시 질소 증비효과, 생육 및 수량성을 검토코자 2008년 10월부터 2009년 10월까지 수행하였다. 동계 사료작물로 청보리 (영양), 하계 사료작물로 옥수수 (광평옥), 수수×수단그라스 (G7)를 재배하여 토양화학성, 양분흡수량, 생육 및 수량성을 검토하였다. 공시토양은 유기물, 유효인산 및 치환성칼슘 함량이 매우 적었고 치환성 마그네슘?나트륨 함량이 많은 강알칼리성 염류토양 이었다. 재배기간 동안 토양염농도 변화는 0.1%이하를 나타냈고 염피해는 없었다. 동?하계작물 경엽 및 곡실 중 무기양분 함량은 질소증비로 증가하는 경향을 나타냈으며 옥수수에서 높았다. 특히 청보리 무기성분 중 T-N, CaO, MgO 함량은 일반농경지에서 재배된 것에 비하여 2배정도 낮은 반면에 P2O5, Na2O 함량은 2배정도 높았다. 청보리는 질소증비로 초장이 길고 경수 확보가 많았으며 10,740∼13,170 kg ha<SUP>-1</SUP> 건물수량을 나타냈다. 또한 하계작물은 질소증비로 초장이 길고 경직경이 굵었으며 옥수수 13,120∼15,050 kg ha<SUP>-1</SUP>, 수수×수단그라스 14,400∼19,440 kg ha<SUP>-1</SUP> 건물수량을 나타냈다. 결론적으로 간척지토양은 생산성을 향상시키고 양분균형을 이루기 위하여 종합적인 토양관리가 선행되어야 할 것으로 생각된다. This study was conducted to find out the optimum cropping system for the stable production of forage crops in the newly reclaimed land located at Gwanghwal region of Saemangum reclaimed land in which the soil is sandy loam (Munpo series). There were two treatments of nitrogen fertilization 20% increment based on the standard fertilization of 150, 200 kg ha<SUP>-1</SUP>. Whole crop barley as the winter crop sowed on 27 October. After the whole crop barley was harvested at the end of May. Corn and sorghum×sudangrass as the summer crop sowed at the early of June successively on the same field. Emergence rate the whole crop barley was high while the summer crops were low. Soil salinity was increased during cultivation of summer crops. However, corn and sorghum×sudangrass were not damaged by salt. Increase of nitrogen fertilization made the growth of cultivation crops good, stem and leaf tended to have a lot of the mineral nutrients at heading stage and silking stage. After experiment, among soil chemical properties pH, content of exchangeable sodium were decreased and content of organic matter, available phosphate were increased. Dry matter yield were showed whole crop barley 13,170 kg ha<SUP>-1</SUP> and sorghum×sudangrass 19,440 kg ha<SUP>-1</SUP> by increment of nitrogen fertilization. Therefore, to improve the product and nutrient balance of reclaimed saline land comprehensive soil management should be considered.
강태경 ( Tae Gyoung Kang ),김승희 ( Seung Hee Kim ),전현종 ( Hyun Jong Jun ),최덕규 ( Duk Kyu Choi ),이채식 ( Chae Sik Lee ),최용 ( Yong Choi ),백남현 ( Nam Hyun Baek ) 한국농업기계학회 2012 바이오시스템공학 Vol.37 No.6
Purpose: While an unmanned helicopter has been extensively used for spraying chemicals on agricultural crops, its low utilization (two months per year from July to August) has recently become an issue. This study aimed to increase the utilization of the unmanned helicopter. The centrifugal rice seeder, a mounting device for rice seeding for unmanned helicopter was developed and assessed its performance. Methods: The concept of the centrifugal spraying device was to obtain design criteria for centrifugal distribution. Four types of blade shapes namely straight, curved, straight wing and curved wing were developed and used. The rotational speed of the blades was tested at 1,000, 1,200 and 1,400 rpm. Results: The blade shapes, rotational blade speed and angle of trajectory were theoretically analyzed and results were validated with a series of laboratory experiments. Conclusions: The curved wing blades provided the distribution uniformity (DU) at 1,200rpm of rotational speed and 60 degree of seed drop point. The spray uniformity of 4.2% was also achieved.