• Title, Summary, Keyword: 관주

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Pesticide residual characteristics in Strawberry, treated by drenching under hydroponics (관주처리에 따른 양액재배 딸기의 농약잔류 특성)

  • Lee, Hyo-Sub;Hwnag, In-Seong;Cheon, Jae-In;Kwon, Hye-Young;Hong, Su-Myeong
    • Journal of Applied Biological Chemistry
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    • v.62 no.1
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    • pp.11-17
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    • 2019
  • Strawberries are one of the main commodities in Korea and have been exported over 40 million dollar. Because the strawberry cultivation using hydroponics has increased, treatment of pesticide by drenching draw interest recently. However, detailed researches for drenching treatment of pesticide are limited, which results in difficulties in proper pesticide applications in agricultural fields. To activate use of drenching and improve safety in agricultural products, In this study, time-dependent residual characteristic of pesticides were compared with between different applications of pesticides in strawberries. The characteristics of azoxystrobin, prochloraz and thiamethoxam were investigated with drenching treatment at different applications: the time of treatment, concentration etc. at hydroponic cultivation for 40 days. Azoxystrobin and prochloraz were not detected at 14 day after application. Thiamethoxam was detected from 0.02 to 0.85 mg/kg. Crop uptake of pesticides was strongly affected with octanol-water partition coefficient and solubility in water. Residual amount in crops are highly dependent on the concentration of active ingredient of pesticides.

Effects of Irrigation Frequency, Particle Size and Depth of Perlite Medium on Growth and Flowering of Dendranthema grandiflorum Grown on Recycling System (순환식 양액재배에 있어서 관주 주기, Perlite의 입자 크기 및 깊이가 국화 '수방력'의 생육과 개화에 미치는 영향)

  • Kim, Sun Hwa;Kim, Ki Sun
    • Horticultural Science & Technology
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    • v.17 no.3
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    • pp.355-360
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    • 1999
  • This study was carried out to investigate the effect of irrigation frequency, particle size and depth of perlite medium on the growth of Dendranthema grandiflorum (Ramat.) Kitamura 'Shuhouno-chikara' grown on recycling system. In Exp 1, the irrigation frequency (IF) was designed as 3 (IF3), 9 (IF9), and 18 (IF18) times a day. Fine and coarse particle size (PS) of perlite was used as a media, and depth of media (DM) was 15 and 10 cm contained in $34{\times}120{\times}15cm$ styrofoam bed. In Exp 2, the IF was 3 (IF3), 6 (IF6), and 9 (IF9) times a day with the same amount of nutrient solution. Fine and coarse PS were used, and DM was 15 and 7.5 cm. In this study, high IF and fine PS was favorable for plant growth. However, as the IF became frequent, difference of plant growth between fine and coarse PS became smaller. Also, shallow media showed little difference with deep media in plant growth. Thus, decreasing the amount of media was recommended to reduce the production cost.

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Comparison of residue patterns between foliar application and drenching in export strawberry (경엽 및 관주 처리에 따른 딸기 중 침투성 농약 잔류패턴 비교)

  • Lee, Hyo-Sub;Hong, Su-Myeong;Kwon, Hye-Young;Kim, Dan-bi;Moon, Byeong-Chul
    • Journal of Applied Biological Chemistry
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    • v.60 no.4
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    • pp.313-319
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    • 2017
  • Strawberries are one of the main commodities in Korea and have been exported over 30 million dollar. And the safety has recently become an important issue in the agro-trade, pesticide residue is most important matter of safe agricultural products. As strawberries can be cultivated using elevated production system, so it is possible to use the drenching. When spraying the pesticides, the use of drenching can be lower amount of residual than using foliar treatment. In this study, time sequential residual amount of pesticides were compared between drenching and foliar application in strawberries. Pesticides were treated with the standard and double dosage and samples were collected at 0, 3, 6, 9, 13, 16 and 21 day and analyzed by LC and LC-MS/MS after liquid-liquid extraction and QuEChERS. Two pesticides were detected less than 1 mg/kg in all samples for drenching treatment. Carbendazim residues in drenching treatment were 5 to 25 times lower than foliar application. And azoxystrobin was not detected in strawberries of drenching treatment.

Effect of Application of Salicylic Acid on the Plant Growth and Fruit Quality in Strawberry (살리실 산 처리가 딸기 생육과 과실 품질에 미치는 영향)

  • Choi, Hyo Gil;Hwang, Mi Ran;Choi, Kyeun Soo;Kang, Nam Jun
    • Journal of agriculture & life science
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    • v.52 no.5
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    • pp.11-22
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    • 2018
  • Effects of exogenously applied salicylic acid on the growth and fruit quality in 'Maehyang' and 'Sulhyang' strawberry plants was investigated. Growing patterns of 'Maehyang' and 'Sulhyang' strawberry plants based on leaf length, leaf width, leaf area and SPAD values were generally unaffected by foliar or rootzone application of salicylic acid. The fruit weight and soluble solids in 'Maehyang' and 'Sulhyang' strawberry plants have not been influenced by application of salicylic acid. However, firmness of fruits were significantly increased by foliar and rootzone application of salicylic acid. The activities of SOD and POD in the leaves of 'Maehyang' and 'Sulhyang' strawberry plants were also significantly increased by foliar and rootzone application of salicylic acid. Plants were foliar- and rootzone-applied with exogenous salicylic acid(0.5 and 1.0 mM). The levels of $H_2O_2$ and superoxide anions in the leaves of 'Maehyang' and 'Sulhyang' strawberry plants were reduced by foliar or rootzone application of salicylic acid.

The Effect of Chitosan Treatment on Growth, content of Sugars of Autumn Potatoes in Jeju Island (키토산 처리가 제주산 가을감자의 생육 및 저장중 체내성분변화)

  • 양국남;박용봉;김기택
    • Proceedings of the Korean Society for Bio-Environment Control Conference
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    • pp.65-66
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    • 2001
  • 제주도의 감자재배면적은 전국의 30.6%를 차지하고 있으며 본도 제2의 소득작물로 자리잡고 있는데 최근 국내외적으로 친환경농산물에 대한 관심이 고조됨에 따라 안전농산물에 대한 수요가 늘면서 유기농업자제를 이용한 고품질 안전 농산물을 생산하려는 시도가 늘어가고 있다. 이런 관점에서, 키토산을 \circled1토양처리 (1kg/a), \circled2키토산침지 (0.2%/30분), \circled3토양처 리+생육기처리 100배 (2회), \circled4토양처리+생육기처리 200배 (2회), \circled5생육기처리 100배 (2회), \circled6생육기처리+200배 (2회), \circled7무처리로 구분하여 시험하였다. 발아율은 대조구에 비해서 종서침지, 토양관주+생육기 200배처리, 생육기 200배처리한 것이 다소 높은 편이었고, 경장 경수 및 복지수는 시일이 경과할수록 많은 편이고 그 중에서 종서침지가 가장 양호한 편이었다. 그리고 10a당 총수량, 상서수량 및 설서수량(30g이하인 괴경)은 역시 종서침지, 토양관주+생육기 200배 (2회)처리 및 토양관주+생육기 100배처리 순서로 상서수량이 많은 편이었다. 처리별 상서수량은 종서침지한 것이 71%, 29%로 가장 많았고 토양관주+생육기 100배처리한 것이 대조구보다 많은 경향이었다(Table 1).

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Effect of Subirrigation of Dolrido on the Growth of Rose (토양 미생물제제인 돌리도의 관주처리가 장미의 생육에 미치는 영향)

  • 손병구
    • Journal of Life Science
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    • v.13 no.6
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    • pp.889-895
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    • 2003
  • This experiment was carried out to investigate the effect of subirrigation of Dolrido on the growth and development of stem cutting and young roes plant. Plant growth was measured at 20, 40, and 60 days after subirrigation of Dolrido. Plant height, stem diameter, number of leaves, leaf area and root length of cutting rose subirrigation were more affected than those of control. The growth of young seedling was significantly affected by subirrigation of Dolrido. Plant height, number of leaves, stem diameter, leaf area, fresh and dry weight were increased with subirrigation of Dolrido. However, T/R ratio was not affected by subirrigation of Dolrido. Growth of seedlings was promoted after 60 days treatment of Dolrido.

Effect of Application Method and Concentration of Plant Growth Retardants On Plant Quality of Potted Saxifraga rosacea Moench

  • Park, Yeon Hee;Kim, Yoon Jin;Jung, Hyun Hwan;Kim, Ki Sun
    • FLOWER RESEARCH JOURNAL
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    • v.19 no.3
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    • pp.127-138
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    • 2011
  • Four different plant growth retardants (PGRs), paclobutrazol, flurprimidol, daminozide, and chlormequat, were applied to potted Saxifraga rosacea 'Kumoma' and 'Kumoma-Gusa' plants for control of the growth and flowering. Paclobutrazol (10, 20, 40, $80mg{\cdot}L^{-1}$), flurprimidol (5, 10, 20, $40mg{\cdot}L^{-1}$), daminozide (500, 1000, 2000, $4000mg{\cdot}L^{-1}$), and chlormequat (50, 100, 200, $400mg{\cdot}L^{-1}$) were applied to the plants by a foliar spray or drenching. In 'Kumoma', application of $40mg{\cdot}L^{-1}$ paclobutrazol by a foliar spray or drenching reduced plant height by 12.5 and 12.6 cm, and flower length by 3.4 and 3.3 cm, respectively. On the other hand, in 'Kumoma-Gusa', drenching of paclobutrazol reduced plant height by 10.7 to 12.6 cm and flower length by 2.0 to 3.9 cm with increasing concentration, but the number of florets almost fell to 20 as compared to 40.5 in the control. 'Kumoma-Gusa' plants drenched with $80mg{\cdot}L^{-1}$ paclobutrazol and sprayed with $40mg{\cdot}L^{-1}$ flurprimidol had the shortest heights of 10.7 and 9.9 cm, and floral length of 2.0 and 1.5 cm, respectively. A flurprimidol drenching at $40mg{\cdot}L^{-1}$ delayed the harvest by 3-13 days as compared to the control and the smallest number of florets, 15.6, was observed in this treatment. In both cultivars, chlormequat and daminozide did not effectively influence the growth and flowering. However, number of florets increased to more than 41 at all concentrations and up to 63, the greatest floret number, with chlormequat drench in 'Kumoma-Gusa'. These results demonstrated that over $40mg{\cdot}L^{-1}$ of paclobutrazol or 5 to $20mg{\cdot}L^{-1}$ of flurprimidol could be used as PGRs to control the growth of floral length and flowering for improving potted plant quality in S. rosacea 'Kumoma' and 'Kumoma-Gusa'.

Biological control of Paraconiothyrium minitans CM2 on Lettuce Sclerotinia Rot Caused by Sclerotinia sclerotiorum (Paraconiothyrium minitans CM2의 상추 균핵병균(Sclerotinia sclerotiorum)에 대한 생물적 방제)

  • Lee, Sang Yeob;Hong, Sung Kee;Kim, Jeong Jun;Han, Ji Hee;Kim, Wan Gyu
    • The Korean Journal of Mycology
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    • v.40 no.4
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    • pp.271-276
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    • 2012
  • A mycoparasite, Paraconiothyrium minitans CM2 was selected for biological control of sclerotinia rot of lettuce caused by Sclerotinia sclerotiorum. The experiment was carried out in a lettuce greenhouse in Yangpyeong from March to April.. When lettuce sclerotinia rot showed in the early stage of occurrence, Conidial suspension of the mycoparasite was weekly treated once to three times onto soil surface around lettuce plants. Incidence of sclerotinia rot in the once-application plot of the mycoparasite ($1{\times}10^7$ spores/$m{\ell}$) and in the benomyl(WP)-treated plot was 11.0% and 2.7%, respectively, whereas that of control was 31.0%. Incidence of twice- and three-application plots of the isolate was 7.9% and 12.8%, respectively. For increasing the effect of the mycoparasite, the experiment for the timing of application of P. minitans CM2 was carried out in a lettuce greenhouse in Yangpyeong and Suwon. Control efficacy against lettuce sclerotinia rot in the soil-drenching plots of P. minitans CM2 ($5{\times}10^6$ spores/$m{\ell}$) in the planting was 75.3~84.7%, and control effect by treatment of the isolate at the pot drenching+the soil-drenching plots in the early stage of disease occurrence was 63.8~58.0%. As the results, P. minitans CM2 could be a prospective biofungicide for biological control of sclerotinia rot of lettuce.

Effects of Concentration of Nutrient Solution and Irrigation Frequency on Growth and Flower Quality of Cut Chrysanthemum Grown Hydroponically in Perlite (국화의 펄라이트 양액재배시 양액농도 및 관주주기가 생육과 절화 품질에 미치는 영향)

  • Ji, Eun Young;Oh, Wook;Kim, Sun Hwa;Kim, Ki Sun
    • Horticultural Science & Technology
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    • v.16 no.1
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    • pp.37-39
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    • 1998
  • This study was carried out to investigate the effects of nutrient solution concentration, irrigation frequency on growth, flowering, and cut flower longevity of Dendranthema grandiflorum (Ramat.) Kitamura 'Shuhouno-chikara' hydroponically grown in perlite media. Not only stem length but also mineral contents of each plant organ in nutrient solution culture were much higher than those in soil culture. 1/2S of nutrient solution was good at early stage, but 1S of nutrient solution was better as chrysanthemum growth progressed. Among different concentrations of nutrient solution, mineral contents of each plant part showed no significant difference. 1S treatment of nutrient solution increased the vase life by 3 days than 2S treatment. The growth and mineral contents of each plant organ were great in plants irrigated 8 times a day, because of high moisture contents of medium and high water availability, followed by more frequent nutrient replenishment near roots. There was no correlation between nutrient solution concentration and vase life of cut flower grown in nutrient solution culture. Cut flowers irrigated twice per day had the longer vase life than other treatments (4, 8 times).

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Effects of Fungicidal Drenches on Damping-off Organisms in Ginseng Seed Bed and Yield of the Seedling Root (살균제의 토양관주에 따른 인삼모잘룩병균(자묘입고병균)의 숫적면화(수적변화) 및 묘삼뿌리의 수량)

  • Choi Hah Ja;Chung Hoo Sup
    • Korean journal of applied entomology
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    • v.10 no.1
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    • pp.7-12
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    • 1971
  • 1. The number of Rhizoctonia solani, Pythium debaryanum, Fusarium and Trichoderma was detected by the modification of Boosails special plating method when ginseng seed bed was drenched with Captan, Difolatan, Zineb, Maneb and PCNB at weekly intervals. Pythium debaryanum Hesse was described for the first time on Panax ginseng in Korea. 2. The number of Rhizoctonia solani and Pythium debaryanum was decreased gradually as the geason Progressed, whereas that of Fusarium and rrichcderma was increased. 3, The number of Rhixoctonia solani was greatly reduced by PCNB, and soils treated with other fungicides generally showed less Rhizoctonie solani than in the control. The number of Pythium debaryanum was significantly reduced by Zineb, Maneb, followed by Captan and Difolatan. None of the fungicids reduced the number of Fusarium colonies in the fourth week. Effects of the chemicals on Trichoderma were not statistically significant. 4. More fresh weight of the seedling roots was obtained using Difolatan, Maneb and PCNB. Phytotoxicity was noted with Maneb, Zineb and Captan after the third treatment.

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