• 제목/요약/키워드: Rice field

검색결과 2,192건 처리시간 0.028초

고려인삼(高麗人蔘)의 답전윤환재배(畓田輪換栽培) 효과(效果) (Crop Rotation of the Korean ginseng (Panax ginseng C.A.Meyer) and the Rice in Paddy Field)

  • 조재성;김충수;원준연
    • 한국약용작물학회지
    • /
    • 제4권1호
    • /
    • pp.19-26
    • /
    • 1996
  • 인삼의 답전윤환재배에 있어서의 문제점을 파악하는 한편 답전윤환 재배지 토양의 이화학적 특성과 인삼의 생육 및 수량을 조사하며 논에서의 인삼연작재배의 안전성 기작을 구명하여 인삼의 답전윤환재배를 위한 기초를 확립하고자 본 실험을 수행하였던 바 그 결과를 요약하면 다음과 같다. 1. 금산지방에서의 답전윤환 인삼재배시 가장 심각한 문제점은 벼의 재배후에 토양에 잔류하는 무기염류의 과다였다. 2. 밭재배지에 비하여 답전윤환 인삼재배지에서 유기물함량과 CEC 그리고 가리를 위시한 각종 양이온의 함량이 높은 경향이었다. 3. 답전윤환 초작지와 재작지에서의 3년생 및 4년생 인삼의 경엽생육은 밭초작지 인삼의 생육과 뚜렷한 차이가 없었으나 이들에 비해 밭재작지 인삼의 경엽생육은 현저하게 떨어졌다. 또한 답전윤환 재배지에서는 황병의 발생이 많았으며 땅강아지가 우점해충이었다. 4. 답전윤환 초작지와 재작지에서의 4년생 인삼근의 생육 및 간당 근수량은 밭초작지 인삼의 생육 및 수확량과는 뚜렷한 차이가 없었으나 이들에 비해 밭재작지 인삼근의 수량은 현저한 감소를 나타내었다. 5. 답전윤환재배시 인삼의 재배후에 4년정도 벼를 재배한 다음 다시 인삼을 재배하여도 인삼에 연각장해현상이 뚜렷하게 나타나지 않았으며 또한 근부병의 발생도 심하지 않아 비교적 안전한 재작이 가능하였다. 6. 답전윤환지에서 재배된 4년생 인삼의 조-Saponin 및 개별 Saponin함량은 관행의 방법으로 재배된 인삼과 전혀 차이가 없었다. 7. 정상답에 비하여 인삼재배답 토양의 비옥도가 대체로 약간 저조한 경향이었으나 수도의 생육 및 수량에는 전혀 영향을 미치지 않았다.

  • PDF

중부지방에 있어서 벼물바구미의 년중 발생 경과 (Seasonal Change in Rice water Weevil, Lissorhoptrus oryzophilus Kuschel (Coleoptera : Curculionidae), in Rice Field)

  • 김용현;고현관;이기열;최용문;임경섭
    • 한국응용곤충학회지
    • /
    • 제29권3호
    • /
    • pp.176-179
    • /
    • 1990
  • 경기도 시흥시 무지동 포장에 추청벼를 1989년 5월 25일 이앙하여 벼물바구미의 각 태별 발생소장을 조사한 결과는 다음과 같다. 시험포장내 육안 조사결과 월동성충의 발생 최성기는 5월 하순이었고, 신성충의 발생 최성기는 8월 상순이었다. 벼물바구미 월동성충의 산란시기는 5월 30일부터 6월 27일까지었고, 산란 최성기는 6월 상순이었다. 벼물바구미 유충은 6월 상순부터 8월 상순까지 발생하였고, 최성기는 7월 중순이었고, 번데기는 7월 상순부터 8월 하순가지 발생하였고, 최성기는 7월 하순이었다. 신성충의 최초 최성기는 8월 상순이었다. 공중포충망에 의한 월동성충의 유살최성기는 5월 중, 하순이었고 유아등에 의한 신성충의 유살 최성기는 7월 하순이었다.

  • PDF

관개수원에 따른 논에서의 영양물질 배출 특성 (Characteristics of Nutrient Export from Paddy Rice Fields with Irrigation Practices)

  • 황하선;공동수;신동석;전지홍
    • 한국물환경학회지
    • /
    • 제20권6호
    • /
    • pp.597-602
    • /
    • 2004
  • Field experimental study was performed to examine characteristics of nutrient export from paddy rice fields with irrigation practices. Experimental fields with surface-water and ground-water irrigation were monitored and analyzed during rice culture period. The water balance showed that outflow generally balanced the inflow showing that about half (58~68%) of total outflow was lost by surface drainage. Water and nutrient export are more in surface-water irrigation paddy than in ground-water irrigation paddy. The reasons might be more irrigation water available and easy to use in surface-water irrigation. If irrigation water reduced, it could result in reduction of nutrient export in paddy rice fields, which can save water and protect water quality. However, deviation from conventional standard practices might affect the rice yield and further investigations are necessary.

압축토양의 투수성과 수도생육 및 수확량에 관한 연구 (A Study on the Effect of the Permeability to Yield Weight of Paddy Rice on the Compressed Soil)

  • 조형용
    • 한국농공학회지
    • /
    • 제15권2호
    • /
    • pp.2968-2979
    • /
    • 1973
  • The aim of this study was to bring light on the effect of permeability to yield weight of paddy rice on the compressed soil. a) The percolation volume during the growth of paddy rice reduced, while the degree of compression on soil column increased and varied by the evaporation and absorption volumn. b) The percolation volume in the natural soil column was notably low compared with that of in the artificial and had little influence to the variation of permeabilty by compression. c) The results in growth of paddy rice were best on the section of low compression and the yield weight reduced, while the degree of compression on the soil column increased. d) The relationship between the yield weight and percolation volumn, under the condition when percolation volume is 1mm/day, had little difference in the yield weight but immediately reduced under $0.5{\sim}1.0mm/day$. The consequences of investigation are not so perfect, but have done my best to get some new data for effect on additional yield by inquiring into influences of permeability to the yield weight of paddy rice on compressed paddy field. I will have a great pleasure if treatise helps investigaters or the men of affairs in this field.

  • PDF

Effects of temperature and water management in rice fields on larval growth of Pantala flavescens (Odonata: Libellulidae)

  • Bosomtwe Augustine;Jinu Eo;Myung-Hyun Kim;Min-Kyeong Kim;Soon-Kun Choi;So-Jin Yeob;Jeong-Hwan Bang;Owusu Danquah Eric
    • 환경생물
    • /
    • 제39권4호
    • /
    • pp.536-541
    • /
    • 2021
  • Pantala flavescens is a dominant Odonata species in the rice fields in Korea. To determine the effects of different temperatures on its larval growth and emergence, field and laboratory experiments were conducted. Larval growth was also monitored in mono-cropping and double-cropping rice fields. The growth of larvae was monitored every week by measuring the head width. In the field experiment, no difference was found in larval growth and emergence between the control temperature and +1.9℃ of the control temperature. The larval growth was greater at 23℃ than at 20℃ laboratory temperatures, and no emergence was recorded at either temperature after eight weeks of monitoring. There was a quadratic relationship between larval growth and temperature in an incubator at five temperature regimes of 15, 20, 25, 30, and 35℃. Midseason water drainage caused the extinction of the existing individuals and newly hatched larvae dominated after re-watering in the rice fields. Larval size was greater in double-cropping fields than in mono-cropping fields in late July but the tendency was reversed in early August. The results of this study suggest that temperature warming will directly promote the larval growth of P. flavescens and indirectly influence seasonal growth via changes in water management in rice fields.

입제의 수면처리에 의한 주요수도해충의 동시방제 (Simultaneous Control of Several Rice Insect Pests by Broadcasting Application of Granulated Insecticides (Terracur P, Lebaycid, and Gamma-BHC))

  • 최승윤;배상희;송유한
    • 한국응용곤충학회지
    • /
    • 제9권1호
    • /
    • pp.25-32
    • /
    • 1970
  • 본 시험은 유기인계 살충제인 Terracur P입제 및 Lebaycid 입제와 유기염소계 살충제인 상감마입제$(\gamma-BHC 입제)$를 수면시용 하였을때 수도요해충인 이화명충, 끝 동매미충, 애멸구 및 흰둥멸구에 대한 동시방제가능성과 방제적기를 구명하고 약제간의 방제효과를 비교코저 실시하였다. 얻어진 시험결과는 다음과 같다. 1) 약제처리후 부화직후 이화명충 접종 시험에 있어서 상감마와 Terracur P는 높은 살충율을 보였으나 Lebaycid의 살충율은 낮았다. 約 $50\%$ 살충력 잔효일수에 있어서 상감마는 8-14日이었고 Terracur P는 6일간이었다. 2) 당초 계획된 방제적기에 관한 정보는 얻을 수 없었다. 즉 주어진 일간격이 좁아 유의한 차를 얻을 수 없었다. 3) 1,2화기 이화명충에 대한 방제효과는 Terracur P=상감마>Lebaycid의 순이었다. 4) Terracur P와 Lebaycid 입제의 처리는 끝동매미충의 방제효과가 좋았으나 상감마$(\gamma-BHC 입제)$의 방제효과는 기대할 수 없었다. 끝동매미충에 대한 Terracur P와 Lebaycid입제의 잔효력은 30일 이상이었다. 5) 애멸구와 흰등별구에 대한 시험은 충의 서식밀도가 낮기 때문에 약제간 방제효과를 얻을 수 없었다. 6) 공시약제중 Terracur P와 Lebaycidd입제는 이화명충과 끌동매미충의 동시방제제로서 사용할 수 있을 것 같다.

  • PDF

평지 전작 유출수의 수문·수질 특성 모니터링 (Monitoring the Hydrologic Water Quality Characteristics of Discharge from a Flat Upland Field)

  • 박찬우;오찬성;최순군;나채인;황세운
    • 한국농공학회논문집
    • /
    • 제62권3호
    • /
    • pp.109-121
    • /
    • 2020
  • Converting the agricultural land-use of rice field to upland has been increasingly conducted as farmers encourages themselves to grow higher value-added crops on rice fields under the policy support. Comparing to rice field, Upland shows different characteristic of discharge due to the slope, scale, and shape of field and characteristics of rainfall event. In this study, we designed the experiment fields reflecting flat-upland characteristics with different land scale, and tried to collect the discharge and load data. Soybeans and corn were selected as target crops considering the possibility of large-scale cultivation and crop demand. The cultivation was conducted during the growth period in 2019 with 3 different field scales. Hence, we have collected the discharge data from 17 rainfall events and the load data for 8 rainfall events. As a result, the magnitude of rainfall events and the discharge duration were found to have a strong positive correlation and field discharge occurred during the period by 55% to 83% of rainfall duration. Besides we found other relationships and characteristics of rainfall event, discharge, and pollutant load and also pointed out that continuous monitoring and more data are required to derive statistically significant results. Compared with slope-field monitoring data obtained from the precedent research, the runoff ratio of the flat-fields was significantly lower than slope-fields. Overall the discharge in the slop and flat-fields shows appreciably different characteristics so that the related researches need to be further conducted to reasonably assess environmental impact of agricultural activities at flat-field.

유전자변형 벼로부터 일어나는 화분비산의 시공간적 특성 (Temporal and Spatial Characteristics in the Pollen Flow of Living Modified Rice)

  • 안주희;조강현
    • 한국작물학회지
    • /
    • 제54권2호
    • /
    • pp.210-217
    • /
    • 2009
  • 본 연구에서 실행한 LM 벼의 화분비산 연구는 non-LM벼와 잡초성 벼의 의도치 않은 교잡은 경작지의 생태계에 문제를 야기할 기능성이 커지고 있다. 본 연구는 이를 예방하기 위한 벼의 이격거리 설정을 위하여 수행하였다. 1. 벼의 개화기간의 개화시간$(10:00{\sim}14:00)$의 주풍은 남풍이었으며, 시간대별 풍속은 $0.94{\sim}1.77$ m/s이었다. 2. 개화기는 LM벼와 Wild벼가 일치하는 기간은 8일이였으며, LM벼와 Wild벼의 최성기는 4일의 차이가 있다. 3. LM벼의 화분이 non-LM벼보다 유의하게 작게 조사되었다. 4. 화분채집량은 위가 노출된 슬라이드 글라스가 위가 덮인 슬라이드 글래스 보다 많았으며 LM벼가 Wild벼보다 비산량이 많았다. 5. 벼 화분의 비산은 오전 10시부터 오후 2시까지 대부분 이루어졌다. 6. 거리에 따른 화분비산량은 1 m까지는 급격히 감소하였으며 2 m이상에서는 서서히 감소하는 전형적인 지수함수를 나타냈으며, 3 m이상에서는 거의 발견되지 않았다.

Molecular Analysis of Bacterial Community Structures in Paddy Soils for Environmental Risk Assessment with Two Varieties of Genetically Modified Rice, Iksan 483 and Milyang 204

  • Kim, Min-Cheol;Ahn, Jae-Hyung;Shin, Hye-Chul;Kim, Tae-Sung;Ryu, Tae-Hun;Kim, Dong-Hern;Song, Hong-Gyu;Lee, Geon-Hyoung;Ka, Jong-Ok
    • Journal of Microbiology and Biotechnology
    • /
    • 제18권2호
    • /
    • pp.207-218
    • /
    • 2008
  • The impacts of planted transgenic rice varieties on bacterial communities in paddy soils were monitored using both cultivation and molecular methods. The rice field plot consisted of eighteen subplots planted with two genetically modified (GM) rice and four non-GM rice plants in three replicates. Analysis with denaturing gradient gel electrophoresis (DGGE) of PCR-amplified 16S rRNA genes revealed that the bacterial community structures were quite similar to each other in a given month, suggesting that there were no significant differences in bacterial communities between GM and non-GM rice soils. The bacterial community structures appeared to be generally stable with the seasons, as shown by a slight variation of microbial population levels and DGGE banding patterns over the year. Comparison analysis of 16S rDNA clone libraries constructed from soil bacterial DNA showed that there were no significant differences between GM and non-GM soil libraries but revealed seasonal differences of phyla distribution between August and December. The composition profile of phospholipid fatty acids (PLFA) between GM and non-GM soils also was not significantly different to each other. When soil DNAs were analyzed with PCR by using primers for the bar gene, which was introduced into GM rice, positive DNA bands were found in October and December soils. However, no bar gene sequence was detected in PCR analysis with DNAs extracted from both cultured and uncultured soil bacterial fractions. The result of this study suggested that, in spite of seasonal variations of bacterial communities and persistence of the bar gene, the bacterial communities of the experimental rice field were not significantly affected by cultivation of GM rice varieties.