• Title, Summary, Keyword: Fallow paddy field

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A Study on the Water Quality Management in Fallow Paddy Fields (휴경논에서의 수질관리 연구)

  • Kim Hyung-Jong;Kim Sun-Joo;Kim Phil-Shik;An Yeul;Yang Yong-Suck
    • Journal of The Korean Society of Agricultural Engineers
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    • v.48 no.2
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    • pp.69-76
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    • 2006
  • Fallow paddy areas have been increased due to the import of cheap agricultural product, and the unbalance between farming cost and rice price since 1990. The increasing fallow paddy area needs to be protected from the devastation by weed breeding for the re-cultivation. In this study, two fallow paddy fields managed with different water depth were selected for monitoring and analysing of water quality, water balance and plant body change. The managed fallow paddy fields were more effective in water quality purification and plants growth control than non-managed fallow paddy fields. And the fallow paddy field managed with some degree of water depth was the most effective field in terms of weed control.

The Improvement of Water Quality Purification through the Effective Management of Fallow Paddy Fields (휴경논의 효율적 관리를 통한 수질개선 효과 연구)

  • Jee, Yong-Keun;Kim, Sun-Joo;Kim, Phil-Shik
    • Journal of The Korean Society of Agricultural Engineers
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    • v.51 no.1
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    • pp.33-39
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    • 2009
  • A number of fallow paddies field continues to increase because of adverse agricultural circumstance such as upsurge income of foreign products, increase of labor costs in local community, imbalance between productivity and profitability etc. Such fallow paddies are necessary to be protected against weeds and trees. If fallow paddies are not managed, it will be devastated and needed cost for re-cultivation. Therefore, management of gradually increased fallow paddy fields should be conducted. In this study, the effect of plants growth inhibition and water quality purification through the control of flood in fallow paddy were examined in an experimental field. The managed and unmanaged fallow paddies through the control of water depth were constructed in the experimental field. The monitoring was conducted from 2005 to 2007. As the result, the managed fallow paddies were more effective than the unmanaged ones on the growth inhibition and water purification. In addition, when the fallow paddy is managed with regular water depth, it was the most effective in the plants growth inhibition.

Water Quality Improvement Characteristics in Fallow Paddy by the Shallow Pool and Shallows (휴경지의 웅덩이와 여울에 의한 수질정화특성)

  • Kim, Sun-Joo;Kim, Hyung-Jung;Kim, Phil-Shik;Jee, Yong-Geun;Yang, Yong-Seok
    • Journal of The Korean Society of Agricultural Engineers
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    • v.48 no.3
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    • pp.35-45
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    • 2006
  • Fallow paddy areas have been increased due to the import of cheap agricultural product, and the unbalance between farming cost and rice price since 1990. In domestic, rice production control that decrease paddy field area has been introduced for the control of rice demand and supply and stabilization of rice price since 2003. Because of the desire of paddy field's owner to create benefit by using paddy for other object, fallow paddy would be continuously increased. In the other aspect, many people in the world is suffering from hunger because of the shortage of food. In case of Korea, continuous drought and flood damages will be potential concern of stable food supply. From this viewpoint, the increasing fallow paddy area needs to be protected from the devastation by weed breeding for the re-cultivation. In this study, fallow paddy managed with the shallow pools and shallows was selected fur monitoring and analyzing of water quality and plant body change. As the results, the managed fallow paddy found to be effective in the purification of water quality and the control of plant growth.

A Sutdy on the Water Quality Management using Fllow Paddy (유휴농지를 이용한 수질관리방안 연구)

  • Kim, Hyung-Joong;An, Yeul;Kim, Sun-Joo;Kim, Phil-Shik
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.485-489
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    • 2005
  • Fallow paddy has been increased in disadvantageous farming condition area because of importation of foreign agricultural products, labor cost and the imbalance between farming cost and agricultural products price since 1990. The fallow paddy that has gradually increased needs to be prevented from the devastation by weed breeding for re-cultivation. In this study, two fallow paddies that manage with different water depth from the experimental field were selected for observation, and analysis of water quality, water balance and plant body change. The managed fallow paddy was more effective in water quality purification and plants growth control than non-managed fallow paddy. And the fallow paddy managed with a some degree water depth was the most effective field on weed control.

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Changes of Physico-chemical Soil Properties, Major Soil Nutrient Contents, and Weed Vegetation in Paddy Fields during Fallow Period (휴경답에서의 토양의 이화확적 특성, 주요 영양분 및 잡초종의 변화)

  • Han, Sung-Uk;Chung, Gap-Chae;Chon, Sang-Uk;Lee, Hee-Jae;Guh, Ja-Ock
    • Korean Journal of Environmental Agriculture
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    • v.17 no.3
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    • pp.211-214
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    • 1998
  • Changes in physico-chemical properties and major nutrient contents were investigated in the soil of paddy fields during fallow period. Weed vegetation change in the fallow paddy fields was also examined. As the fallow period became longer, organic matter content in the paddy soil has gradually increased. Soil pH of the paddy fields has not changed until three years of fallow period and thereafter slightly increased. Cation exchange capacity of the paddy soil, and exchangeable N, K, Ca and Mg contents in the soil tended to decrease until three years of fallow period and then increase with the prolonged fallow period. As the fallow period became longer, available $P_2O_5$ content in the paddy soil has continuously decreased. Available $SiO_2$ content in the paddy soil has not changed until three years of fallow period and thereafter increased. The vegetation in the fallow paddy fields have mostly been occupied by the weeds of the Gramineae, Cyperaceae, and Compositae. As the fallow period became longer, the weeds of the Polygonaceae and Juncaceae have increased, whereas the weeds of the Leguminosae, Commelinaceae, Pontederiaceae, and Onagraceae have gradually disappeared. However, the weeds of the Gramineae and Cyperaceae have always been dominant in the paddy fields during the fallow paddy period.

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Development of Mechanized System Model for the Production of Winter Cereal Wrap Silage in the Fallow Paddy Field (1) - Modelling mechanized roughage production system and previewing its profit - (답리작 맥류 랩-사일리지의 기계화 시스템 모델 개발(1) - 맥류 조사료 기계화 시스템 모델과 기대효과 -)

  • 김혁주;박경규;서종혁;신승열
    • Journal of Biosystems Engineering
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    • v.28 no.2
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    • pp.107-116
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    • 2003
  • One of the major obstructing factors against managing dairy farm in Korea has been a shortage of roughage supply. The shortage of roughage caused excessive use of concentrate feed increase of production cost and deterioration of cattle quality. In order to solve this problem for the dairy farm, use of fallow paddy field in the winter was feasible to produce barley and rye forage during the winter season after harvesting of in. And many desirable effects of raising cattle productivity, saving dollars for importing feeds and providing huge ground for manure spreading are expected by enlarged local roughage production. Through analysing the forage producing process, a mechanized operation model was developed for dairy farms in Korea. Its model consists of seeding models(till, no-till model) and harvesting models(wrap silage, traditional silage, hay model). Currently, the government policies are being executed to urge producing winter cereal wrap silage in the fallow paddy field with various supporting programs. Ant with enlarged local forage production, it is possible to make a new huge market fur forage producing machine.

Development of Mechanized System Model for the Production of Winter Cereal Wrap Silage in the Fallow Paddy Field(3) - Application Test of Mechanized Wrap Silage Production in the Fallow Paddy Field - (답리작 맥류 랩-사일리지의 기계화 시스템 모델 개발(3) - 답리작 맥류 랩-사일리지 기계화 생산의 적응 시험 -)

  • 김혁주;박경규;하유신;홍동혁;나규동;서상훈
    • Journal of Biosystems Engineering
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    • v.29 no.1
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    • pp.1-8
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    • 2004
  • In order to solve the shortage of roughage supply for dairy farm in Korea, winter cereal forage production after harvesting of rice in the fallow paddy field was studied. Two parts are already reported at the previous paper - One was the model development of the mechanized production, and the other was the study of feasibility of the model and its desirable direction in Korea. In this study, the model system is applied for a winter cereal wrap silage production model to practice in Kyungbook National University farm on 3ha scale for 3 years. Results of the research are summarized as follows; It takes 2 or 3 working days to process the wrap silage in middle of May in Daegu region. Also, not much particular problem can be found during the application test of mechanized wrap silage production. Field capacity and field efficiency are estimated to be 0.6-0.85㏊/h and 50-70% in mowing, 1.1∼1.7㏊/h and 52∼80% in tedding and raking, 0.6∼1.1㏊/h and 25∼45% in baling and 0.5∼0.57㏊/h and 75∼85% in wraping, respectively. Total production cost is estimated to be 1,257won/kg-TDN in oversowing and wrap-silage harvest in 1.6㏊ working area. As a result, large scale field is recommended to produce the wrap silage in order to maximize the field capacity.

Development of Mechanized System Model for the Production of Winter Cereal Wrap Silage in the Fallow Paddy Field(4) - Storage property and quality analysis of winter cereal wrap silage - (답리작 맥류 랩-사일리지의 기계화 시스템 모델 개발(4) - 답리작 맥류 랩-사일리지의 저장특성 및 품질평가 -)

  • 김혁주;박경규;하유신;홍동혁
    • Journal of Biosystems Engineering
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    • v.29 no.4
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    • pp.293-300
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    • 2004
  • In order to solve the shortage of roughage supply for dairy farm in Korea, the mechanized model system for the production of winter cereal wrap silage in the fellow paddy field was developed in the previous studies. In this study, storage properties after long term storing of the winter cereal wrap silage were investigated. Also, the qualities of the wrap silage which was stored during 4 months were evaluated by sensory testings, analyzing chemical properties(moisture content, pH and organic acids) and investigating the increase of feeding value. The result of this study were summarized as follows; 1. After 300 hours storage, the acid level of the silage decreased slowly to 4.6 -4.8 pH. Also, the temperature was stabilized around 27-28$^{\circ}C$. The silage having below 5.0 pH is a desirable level for the most of good silage. 2. According to the sensory test and chemical property analyzation it was evaluated as the first class silage like a com silage. 3. Also, when the wrap silage are fed to the cattle, the cattle produced milk more 25% than that of conventional feed. 4. As an overall conclusion, winter cereal wrap silage in the fallow paddy field cm be one of the major roughage source in replacement of com and other conventional silage to dairy cattle in Korea.

Development of mechanized system model for the production of winter cereal wrap silage in the fallow paddy field(2) - Cost analysis of mechanized wrap silge production - (답리작 맥류 랩-사일리지의 기계화 시스템 모델 개발(2) - 기계화 모델을 이용한 랩-사일리지의 생산비 분석 -)

  • 박경규;김혁주;김태한;구영모
    • Journal of Biosystems Engineering
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    • v.28 no.3
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    • pp.199-208
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    • 2003
  • In order to solve the shortage of roughage supply for dairy farm in Korea, winter cereal forage production after harvesting of rice in the fallow paddy field is studied. This study consist of two parts. One is the model development of the mechanized production which was already reported at the preview paper. This is the 2nd parts of the study. Also, the mechanized production model for cereal forage production in winter was reported in the previous study. In this paper, coverage area and mechanized wrap silge production cost are analyzed and compared to the other available feeds in Korea. Results of the research are summarized as follows; The coverage area for the winter cereal wrap silage production system in Korea is estimated to be 33.7 ha in case of working with a tractor and a set of implements. If two or three tractors are available, the coverage area is estimated to be 68.0 and 101.3 ha, respectively. The break even point (BEP) of the farming size is analyzed as 10 ha and its production(operating) cost is estimated to be 317 to 443 won/TDN-kg at the BEP point. The cost is lowered to 182 won/TDN-kg at 100ha-working, and is much lower compared with prices of imported feeds of 360∼600 won/TDN-kg. Therefore, winter cereal wrap silage model is judged to be feasible and desirable for a large scale production of forage in winter fallow paddy field.

Studies an the Egg Parasite, Paracentrobia andoi Ishii (Hymenoptera : Trichogrammatidae) of Green Rice Leafhopper, Nephotettix cinticeps Uhler (1) (끝동매미충 난기생봉 (Paracentrobia andoi)에 관한 연구(I))

  • Kim Jeong-bu
    • Korean journal of applied entomology
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    • v.23 no.4
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    • pp.237-241
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    • 1984
  • The trichogrammatidae ego parasite of the green rice leafhopper (GRLH), paracentrobia andoi, were investigated to know their parasitic activities after overwintering in the paddy banks and fallow fields, their seasonal variation and per cent parasitism in the paddy fields of Gyeongnam provincial O.R.D. at Jinju from 1982 to 1984. The parasitic activities of Paracentrobia andoi after overwintering in the Paddy banks in early Masch were high and tended to decrease remarkably since early April by moving to the fallow fields. The parasitic rate of paracentrobia andoi on GRLH was $21\%$ between late April and early May. the peak of egg laying period of GRLH. The per cent parasitism of the wasps in fallow fields was an average of $0\%$ in Gyeochang and Namji and $9.6-29.2\%$ in Namhae, Kimhae and Jinju. The parasitic activites of Paracentrobia andoi had three peakrs in paddy field, however, the highest peak was ovserved between mid- August and early October. The per cent egg parasitism of Paracentrobia andoi was an average of $16.5\%$ on second generation of Nepotettix cinctireps and $36.7\%$ on third generation of the leafhopper.

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