Journal of Tea Science Pub Date : 2017-09-09 DOI: 10.20425/IJTS.V13I01-02.9981

K. Nyabundi, P. Owuor, G. Netondo, J. Bore

引用次数: 2

Yields and Nitrogenous Fertiliser Use Efficiency Responses of Clonal Tea (Camellia Sinensis) to Locations of Production 无性系茶树产量和氮肥利用效率对产地的响应

Journal of Tea Science Pub Date : 2017-09-08 DOI: 10.20425/ijts.v13i01-02.9983

K. Nyabundi, P. Owuor, G. Netondo, J. Bore

引用次数: 0

Evaluation of Shubhodoya Mycorrhizal Bio-fertilizer for Enhancing Rooting of Nursery Tea Plants. 茶树菌根生物肥料促进苗木生根效果评价。

Journal of Tea Science Pub Date : 2017-09-06 DOI: 10.20425/IJTS.V13I01-02.9982

K. Sitienei, E. Cheramgoi, Methusela Rop, D. Kamau, Robert Keter

引用次数: 1

Influence of Nitrogen Fertilisation on Red Spider Mites (Oligonychus coffeae Nietner) and Overhead Volatile Organic Compounds in Tea (Camellia sinensis) 施氮对茶树红蜘蛛及头顶挥发性有机物的影响

Journal of Tea Science Pub Date : 2017-09-01 DOI: 10.20425/ijts.v13i01-02.9985

Jenipher A. Odak, P. Owuor, L. Manguro, F. Wachira, E. Cheramgoi

{"title":"Influence of Nitrogen Fertilisation on Red Spider Mites (Oligonychus coffeae Nietner) and Overhead Volatile Organic Compounds in Tea (Camellia sinensis)","authors":"Jenipher A. Odak, P. Owuor, L. Manguro, F. Wachira, E. Cheramgoi","doi":"10.20425/ijts.v13i01-02.9985","DOIUrl":"https://doi.org/10.20425/ijts.v13i01-02.9985","url":null,"abstract":"Nitrogen fertilisation influences tea yields, quality and pests infestation levels. Red spider mites reduce tea production in western Kenya during prolonged droughts. Nitrogen fertiliser use maybe an agronomic practice that may influence infestation levels by mites. Overhead volatile compounds (OVOCs) composition also influences infestations of tea by mites. Influence of nitrogenous fertiliser rates on red spider mite infestations and OVOCS levels was determined. Mites populations varied (pd<0.05) with nitrogenous fertiliser rates. High infestations were at 0 and 300 kg N/ha/year, and sharp decline between 150 and 225 kg N/ha/year. Green leaf volatiles increased while some aromatic and terpenoid compounds decreased with increasing nitrogenous fertiliser rates. Significant (pd<0.05) direct linear regressions between 1-penten-3-ol, 3-penten2-ol, E-2-hexenal, Z-3-hexenyl acetate and inverse relationship between 2-phenyl ethanol, ethyl benzene, -methyl styrene, longifolene and ß-cedrene and nitrogenous fertiliser rates were observed. Most aromatic and terpenoid compounds, which are repellents of mites, were highest between 150 and 225 kg N/ha/year where infestations by mites were lowest. The recommended fertiliser rates of 100 to 225 kg N/ha/year in Kenya also produce most repellents of mites, protecting tea plants against infestations. Use of recommended nitrogen rates can protect tea from infestations by mites. Publication Info Article history: Received : 15.02.2017 Revised : 21.07.2017 Accepted : 01.09.2017 DOI: https://doi.org/10.20425/ ijts.v13i01-02.9985","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83114360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Clonal Variations in the Response of Hard Physically Withered Leaf to Rehydration Following Long Chemical Wither Durations 长时间化学凋谢后硬物理凋谢叶片对复水反应的无性系变异

Journal of Tea Science Pub Date : 2017-08-30 DOI: 10.20425/IJTS.V13I01-02.9986

P. Owuor, M. Obanda

{"title":"Clonal Variations in the Response of Hard Physically Withered Leaf to Rehydration Following Long Chemical Wither Durations","authors":"P. Owuor, M. Obanda","doi":"10.20425/IJTS.V13I01-02.9986","DOIUrl":"https://doi.org/10.20425/IJTS.V13I01-02.9986","url":null,"abstract":"Long chemical wither durations and hard physical wither reduce the quality of plain black tea, through reduction in total theaflavins production while encouraging thearubigins formation. Such quality reduction may vary with genetic makeup of the tea plant. However, rehydration reactivates activities of oxidative enzymes responsible for producing plain black tea quality parameters. Influence of rehydrating hard physically withered leaf that had undergone long chemical wither durations on two clonal plain black tea quality parameters were assessed. Rehydration restored the formation of plain tea quality parameters from hard physically withered leaf. However, quality deterioration due to long chemical wither duration could not be reversed by rehydration. The patterns of responses of the clones used were similar. Thus in the processing of plain black tea, efforts should be made to maintain chemical wither durations to below 30 hours. However, rehydration reverses reduced plain black tea quality parameters by hard physical withers to equivalent of chemical wither. Publication Info Article history: Received : 02.08.2016 Revised : 15.04.2017 Accepted : 30.08.2017 DOI:https://doi.org/10.20425/ ijts.v13i01-02.9986","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88877016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Changes in the Composition of Elements in Non-Aerated Green Teas Processed from Seedling Tea (Camellia sinensis) Due to Variations in Nitrogenous Fertilizer Rates and Seasons. 施氮量和季节变化对茶树苗期非充气绿茶中元素组成的影响

Journal of Tea Science Pub Date : 2017-08-30 DOI: 10.20425/ijts.v13i01-02.9987

S. O. Ochanda, P. Owuor, J. Wanyoko, D. Kamau, A. Faraj, C. Onyango

引用次数: 0

Characterization of New Tea (Camellia sinensis L.) Hybrid Progenies Based on Morphological Traits 新茶(Camellia sinensis L.)的特性基于形态性状的杂交后代

Journal of Tea Science Pub Date : 2017-08-10 DOI: 10.20425/ijts.v13i01-02.9980

B. Thuvaraki, M. Ranatunga, J. D. K. Arachchi, V. A. Sumanasinghe

引用次数: 2

Bioactivity of An Organic Synergist in Enhancing the Efficacy of Neem Kernel Aqueous Extracts (NKAE) and Three Recommended Acaricides in Controlling Tea Red Spider Mite ( Oligonychus coffeae ) 有机增效剂对印度楝仁水提物(NKAE)和3种推荐杀螨剂防治茶红蜘蛛螨(Oligonychus coffae)的生物活性研究

Journal of Tea Science Pub Date : 2017-06-30 DOI: 10.5376/JTSR.2017.07.0008

B. Deka, A. Babu, S. Sarkar, S. Mandal, N. Kundu, P. Patanjali, P. Bhandari

引用次数: 4

Wild Teas of Assam and North East India 阿萨姆邦和印度东北部的野生茶

Journal of Tea Science Pub Date : 2017-06-22 DOI: 10.5376/JTSR.2017.07.0007

P. Baruah

引用次数: 9

Antimicrobial and Antihaemolytic Activities of Crude Extracts of Some Commonly Used Tea and Coffee in Nigeria 尼日利亚一些常用茶和咖啡粗提取物的抗菌和抗溶血活性

Journal of Tea Science Pub Date : 2017-05-15 DOI: 10.5376/JTSR.2017.07.0006

F. Olajubu

{"title":"Antimicrobial and Antihaemolytic Activities of Crude Extracts of Some Commonly Used Tea and Coffee in Nigeria","authors":"F. Olajubu","doi":"10.5376/JTSR.2017.07.0006","DOIUrl":"https://doi.org/10.5376/JTSR.2017.07.0006","url":null,"abstract":"Current indiscriminate abuse of existing antibiotics in clinical and veterinary treatments lead to an upsurge in antimicrobial resistant strains of microorganisms and aggressive search for alternatives which are readily available, less expensive with little or no side effect. Tea and Coffee are beverages consumed daily in every household in Nigeria. This study examines the antimicrobial and anti-haemolytic properties of commonly available Tea and Coffee in Nigerian market. The antimicrobial potencies of the extracts were assessed through disc diffusion method on pathogens of both man and animal origin while the anti-haemolytic assay was carried out through colorimetric method. The extracts were slightly acidic at full strength and no antifungal property was observed. Broad spectrum and bactericidal effects were observed against Staphylococcus aureus, Salmonella pullorum, Shigella dysenteriae and Streptococcus pneumonia. These activities were concentration dependent. Very poor activity was observed against Escherichia coli . Bactericidal rate of coffee was at 6hrs but ranged between 18 and 24 hrs for tea extracts. Tea extracts greatly inhibited the haemolytic potential of alpha toxins while coffee performed poorly. Tea and Coffee could thus serve as supportive treatment for some bacterial infections without fear of side effects, since they are naturally taken as daily beverages.","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90676616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

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