• 제목/요약/키워드: field experiment

검색결과 4,957건 처리시간 0.031초

작약 비가림재배에 따른 병 발생 억제효과 및 생육 특성 (Effect of the Rain Shelter Cultivation on Disease Occurrence Inhibition and Growth in Peony(Paeonia lactiflora Pallas L.))

  • 김세종;박준홍;김정혜;박소득;최부술
    • 한국약용작물학회지
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    • 제9권2호
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    • pp.150-155
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    • 2001
  • 작약 비가림 재배시 생육 특성과 수량에 미치는 영향을 구명하기 위해 시험을 수행한 결과는 아래와 같다. 비가림 재배시 노지 재배에 비해 맹아기와 개화기가 각각 9일, 15일빨랐으며 경장, 경수 등도 더 크거나 많았다. 병발생은 녹병, 탄저병, 횐가루병, 뿌리썩음병은 비가림 재배가 노지 재배에 비해 현저히 감소 되었으나 점무늬병은 비슷하였다. 근장, 근수, 근경은 비가림 재배가 노지 재배에 비해 생육이 양호하였으며 뿌리 수량도 비가림 재배가 10a당 2,395kg으로서 노지 재배의 2,201kg, 1,892kg에 비해 27%, 9% 증수 되었다. 품질면에서 뿌리 색도는 비가림 재배가 노지 재배에 비해 더 양호하였으며 상품 수량도 향상되었다.

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작약(芍藥)에서 간작재배(間作栽培)가 선충(線蟲) 밀도(密度)에 미치는 영향 (Effect of Intercropping System on the Population of Nematodes)

  • 추연대;김재철;황형백;박소득
    • 한국약용작물학회지
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    • 제3권2호
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    • pp.116-119
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    • 1995
  • 작약은 다년생 약초로 토양선충에 의한 지하부피해가 많으므로 간작 작부체계에의한 선충피해를 경감할수 있는 재배기술을 개발하고자 관련시험을 수행한 결과를 요약하면 다음과 같다. 1. 작약포장에 서식하는 선충의 종류는 뿌리혹선충, 줄기구근전충, 아엽전충, 뿌리썩이선충, 검선충 등이 있었으며 피해 우점선충은 뿌리혹선충이었다. 2. 작약단작, 작약+고추 및 작약+지황 간작작부제계의 뿌리혹선충 밀도는 큰 차이가 없었으나 작약+참깨, 작약+율무 간작체계에서는 뿌리혹선충 밀도가 작약단작 작부체계에 비해 87%의 감소효과를 보여 선충피해가 우려되는 포장에서는 작약과 참깨 또는 율무를 간작하는 체계가 바람직한 것으로 나타났다. 3.작약의 지상부 병해로는 점무늬병, 흰가루병, 탄저병이 우점하였으며 처리간 점무늬병과 탄저병 발생정도는 비슷하였으나 흰가루병은 작약+고추와 작약+율무 간작사에 발병이 감소하는 경향을 보였다.

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스파크 음원을 이용한 장벽의 회절음장에 관한 실험 연구 (Experimental Study on Sound Diffraction over Barrier Using a Spark Discharge Sound Source)

  • 주진수
    • 소음진동
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    • 제9권3호
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    • pp.466-471
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    • 1999
  • The prediction methods of diffraction field in barrier has beenreported much about the infinite length barrier and it is very few work that reasonable sound source was used in experiment. This study, however, has worked about the several model barrier with acoustic scale model experiment. In the case of scale model experiment, it is difficult to use the kind of source with sufficiently characteristics. A spark discharge sound source with the high repeatability, broad band spectra, small size and omnidirectivity has veen used for the prediction of diffraction field. Several model barriers with different length on the ground were considered for the experiment and compared with the the results calculated by the approximation.

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음향라디오시티법을 이용한 잔향수조 음장 해석과 실험검증 (Acoustic Field Analysis of Reverberant Water Tank using Acoustic Radiosity Method and Experimental Verification)

  • 김국현
    • 대한조선학회논문집
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    • 제56권5호
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    • pp.464-471
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    • 2019
  • The acoustic power is a major acoustical characteristic of an underwater vehicle and could be measured in a reverberant water tank. In order to obtain accurate measurement results, the acoustic field formed by the sound source should be investigated quantitatively in the reverberant water tank. In this research, the acoustic field of a reverberant water tank containing an underwater sound source has been analyzed by using an acoustic radiosity method one of the numerical analysis methods suitable for the acoustic analysis of the highly diffused space. The source level of the underwater sound source and acoustical properties of the water tank input to the numerical analysis have been estimated by applying the reverberant tank plot method through a preliminary experiment result. The comparison of the numerical analysis result with that of the experiment has verified the accuracy of the acoustic radiosity method.

Can Coupon Holding Duration and Message Framing Increase the Effect of Push Notifications on Mobile Coupon Redemption? Evidence from A Randomized Field Experiment

  • Soonki Hwang;Jai-Yeol Son;Sunju Park;Kil-Soo Suh
    • Asia pacific journal of information systems
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    • 제33권3호
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    • pp.812-830
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    • 2023
  • We propose a mobile coupon strategy designed to increase the effect of push notifications on redemption. The proposed strategy recommends that firms deliver mobile coupons with distant expiration dates and remind them through push notifications framed negatively once these expiration dates become imminent, rather than frequently sending coupons with near expiration dates. We test the effectiveness of the proposed strategy using data collected through a randomized field experiment. The findings indicate that push notifications enhance coupon redemption rates for coupons that are held longer by customers than those that are recently received. Additionally, we found that sending negatively framed push notification messages to remind customers of imminent coupon expiration dates further resulted in higher coupon redemption rates. The findings can be employed to offer useful guidance on how to effectively design mobile coupons for achieving higher redemption rates.

벼 출아묘 기계이앙 재배기술 확립에 관한 연구 II. 벼출아묘 육묘온도에 따른 적정육묘일수 및 배유양분 잔존량이 초기생육에 미치는 영향 (Studies on the Cultivation Establishment of Sprouted Seedling for Machine Transplanting of Rice Plant II. Optimum Days of Raising Sprouted Seedling and Effects of Endosperm Rate on Rice Growth in Paddy Field)

  • 양원하;윤용대;송문태;이문희;임무상;박래경
    • 한국작물학회:학술대회논문집
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    • 한국작물학회 1989년도 추계 학술대회지
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    • pp.20-21
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    • 1989
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