• Title/Summary/Keyword: Boxthorn

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Vibration Characteristics of Boxthorn(Lycium chinense Mill) (구기자 가지의 진동 특성)

  • 서정덕
    • Journal of Biosystems Engineering
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    • v.26 no.2
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    • pp.105-114
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    • 2001

  • Modulus of elasticity, modulus of rigidity, damping ratio, and natural frequency of three varieties of boxthorn (Lycium chinense Mill) (Cheongyang #2, Cheongyang gugija, and Cheongyang native) branches were analyzed. Modulus of elasticity and modulus of elasticity and modulus of rigidity of the boxthorn branch was determined using standard formula after simple beam bending and torsion test, respectively, using an universal testing machine. Damping ratio and natural frequency of branches were determined using a system consisted of an accelerometer, a PC equipped with A/D converter, and a software for data analysis. Relationship between the elastic modulus and branch diameter in overall varieties and branch types showed a good correlation (r -0.81). There was, however, no correlation between torsional rigidity and branch diameter. The internal damping results were highly variable and the overall range of the damping ratio of the boxthorn branch was 0.014-0.087, which indicated that the branch was a lightly damped structure. The natural frequency of the boxthorn branch was in the range of 89-363 rad/s for the overall varieties and branch types. A good correlation (r 0.82) existed between the natural frequency and branch diameter in overall varieties and branch type.

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Effects of Organic Composts on Soil and Yield Characteristics of Boxthorn(Lycium chinense Mill.) Organic Cultivation

  • Lee, Bo-Hee;Park, Young-Chun;Lee, Sox-Su;Lee, Byung-Joo;Kim, Yeong-Guk;An, Yeong-Seob
    • Korean Journal of Organic Agriculture
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    • v.19 no.spc
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    • pp.206-209
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    • 2011

  • For the development of Boxthorn organic cultivation techniques, we investigated effect of several organic compost as a foundation fertilizer and growing plant fertilizer. And we adopted partly opening rain shelter greenhouse to protect anthracnose. In organic compost applying test yield characteristics of 'Mixed organic compost' treatment was the best but in betaine content measurement of dried fruit, 'Mixed organic compost and nitrogen guano' treatment was the best and it's chlorophyll and 100 fruit weight were also better than the other treatments.

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Occurrence of Boxthorn Bligth Casued byPhytophthora nicotivanea and P. drechsleri (Phytophthora nicotianae와 P. drechsleri에 의한 구기자 역병의 발생)

  • 지형진;곽용범;이봉춘;조원대
    • Korean Journal Plant Pathology
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    • v.14 no.4
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    • pp.294-298
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    • 1998

  • Since 1995, boxthorn bight caused by Phytophthora spp. has occurred at Chongyang areas in Chungnam province. Infected plants showed yellows and wilt at early stage, but the symptom rapidly progressed into blight due to the decay of roots and basal stem tissues. The disease was relatively severe in poorly drained lowlands and incidence reached ca. 20% in some fields. Two species of Phytophthora were constantly isolated from freshly infected roots and asal stems. Among 39 isolates collected, 26 were identified as P. nicotianae and 13 as P. drechsleri based on their mycological characteristics. Both fungi showed strong pathogenicity to boxthorn cv. Chongyang No. 1. However, the former expressed stronger pathogenicity than the latter. Phytophthora blight of boxthorn caused by the fungi has not been reported n Korea previously.

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