• Title/Summary/Keyword: 온실제어

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Controlled Release of 2,4-D(2,4-Dichlorophenoxy Acetic Acid ) from the Complex of Rice Husk Lignin and 2,4-D-IV. Variation of Herbicidal Activity by Soil Environmental Factors (조곡(組穀) Lignin과 2,4-D (2,4-Dichlorophenoxy Acetic Acid) 결합체(結合體)의 방출제어(放出制御) 연구(硏究)- IV. 토양환경요인(土壤環境要因)에 따른 제초활성(除草活性)의 변이(變異))

  • Guh, J.O.;Lee, D.J.;Lim, K.P.;Kwon, S.L.
    • Korean Journal of Weed Science
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    • v.10 no.2
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    • pp.114-121
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    • 1990
  • Inactivation in soil absorption, translocation of 2, 4-D by plants vary depending upon soil environments and herbicide formulations. Experiment was conducted in a glasshouse using rectangular pots($1350cm^2$) to evaluate the growth responses of barnyardgrass (Echinochloa crus-galli) and Indian jointvetch (Aesehyrcomene indica) to two formulations of 2, 4-D. The formulations used were 40% 2, 4-D amin salt (2, 4-D/AS) and 19.7% complex of rice husk lignin and 2, 4-D (2, 4-D/LG) which were applied at 200g ai/ha. Soil environments included fertilizer levels, soil pH, organic matter contents, and soil textures, Each treatment was replicated three times. The herbicidal activity of 2.4-D increased and lasted with increased levels of fertilizer. The activity also increased and lasted with low soil pH and decreased content of organic matter. Generally 2, 4-D/LG showed higher and longer herbicidal activity than 2. 4-D/AS for both test plants under all conditions applied. However, the herbicidal activity was influenced by the formulations more than by soil textures. It was thought that 2, 4-D/AS was released in a short time and inactivated readily while 2, 4-D/LG was slowly released and gave an opportunity of absorption by plants for a long period.

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In Vitro Quantum Dot LED to Inhibit the Growth of Major Pathogenic Fungi and Bacteria in Lettuce (Quantum Dot LED를 이용한 상추 주요 병원성 곰팡이 및 세균의 생장억제효과 기내실험)

  • Lee, Hyun-Goo;Kim, Sang-Woo;Adhikari, Mahesh;Gurung, Sun Kumar;Bazie, Setu;Kosol, San;Gwon, Byeong-Heon;Ju, Han-Jun;Ko, Young-Wook;Kim, Yong-Duk;Yoo, Yong-Whan;Park, Tae-Hee;Shin, Jung-Chul;Kim, Min-Ha;Lee, Youn Su
    • Research in Plant Disease
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    • v.25 no.3
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    • pp.114-123
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    • 2019
  • QD LED has an ideal light source for growing crops and can also be used to control plant pathogenic microorganisms. The mycelial growth inhibition effect of QD LED light on Rhizoctonia solani, Phytophthora drechsleri, Sclerotinia sclerotiorum, Sclerotinia minor, Botrytis cinerea, Fusarium oxysporum, Pectobacterium carotovorum, and Xanthomonas campestris were investigated. According to the results, BLUE (450 nm) light, suppressed S. sclerotiorum by 16.7% at 50 cm height from the light source, and 94.1% mycelial growth at 30 cm height. Mycelial growth of Sclerotinia minor was inhibited by 80.4% at 50 cm height and 36.3% at 50 cm height in B. cinerea. S. minor, and B. cinerea was inhibited by 100% mycelial growth at a height of 30 cm from the light source. At 15 cm height, all three pathogens (B. cinerea, S. minor, and S. sclerotiorum) was inhibited by 100%. QD RED (M1) and QD RED (M2) light suppressed mycelial growth of S. minor and B. cinerea by 100% at 30 cm and 15 cm height from the light source. For S. sclerotiorum, QD RED (M1) and QD RED (M2) showed 75.2% and 100% inhibition, respectively. Further experiment was conducted to know the suppression effect of lights after inoculating the fungal pathogens on lettuce crop. According to the results, QD RED (M2) suppressed the S. sclerotiorum by 59.9%. In addition, Blue (450 nm), QD RED (M1), and QD RED (M2) light reduce the infestation by 59.9%. In case of B. cinerea, disease reduction was found 84% by BLUE (450 nm) light. Results suggest that the growth inhibition of mycelium increases by Quantum dot LED light.