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Seasonal and Environment Variations of Yields and Yield Components of Tea (Camellia sinensis) Cultivars in Kenya 肯尼亚茶(Camellia sinensis)品种产量和产量构成的季节和环境变化
Pub Date : 2017-09-09 DOI: 10.20425/IJTS.V13I01-02.9981
K. Nyabundi, P. Owuor, G. Netondo, J. Bore
Inter-University Council of East Africa (Lake VictoResearch Initiative (VicRes)); National Council of Scieand Technology (NACOSTI), Kenya; and Tea Research Institute, Kenya
东非大学间理事会(维克托湖研究倡议);肯尼亚国家科学技术委员会(NACOSTI);和肯尼亚茶叶研究所
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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
Pub Date : 2017-09-08 DOI: 10.20425/ijts.v13i01-02.9983
K. Nyabundi, P. Owuor, G. Netondo, J. Bore
Inter-University Council of East Africa (Lake Victoria Research Initiative(VicRes)), National Council of Science and Technology (NACOSTI) and the Tea Research Institute, Kenya
东非大学间理事会(维多利亚湖研究计划(VicRes))、国家科学技术委员会(NACOSTI)和肯尼亚茶叶研究所
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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。
Pub Date : 2017-09-06 DOI: 10.20425/IJTS.V13I01-02.9982
K. Sitienei, E. Cheramgoi, Methusela Rop, D. Kamau, Robert Keter
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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
Pub Date : 2017-09-01 DOI: 10.20425/ijts.v13i01-02.9985
Jenipher A. Odak, P. Owuor, L. Manguro, F. Wachira, E. Cheramgoi
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
氮肥影响茶叶产量、品质和虫害水平。红蜘蛛螨虫在肯尼亚西部长期干旱期间减少了茶叶产量。氮肥的使用可能是一种影响螨虫侵扰程度的农艺做法。头顶挥发性化合物(OVOCs)的组成也会影响螨虫对茶叶的侵害。研究了氮肥施用量对红蜘蛛螨孳生及OVOCS水平的影响。不同施氮量的螨种群差异显著(pd<0.05)。侵染高峰在0 ~ 300 kg N/ha/年,急剧下降在150 ~ 225 kg N/ha/年。随着氮肥施用量的增加,绿叶挥发物增加,部分芳香族和萜类化合物减少。1-戊烯-3-醇、3-戊烯-醇、e -2-己烯、z -3-己烯乙酸酯与氮肥用量呈显著(pd<0.05)直接线性回归关系,2-苯乙醇、乙苯、-甲基苯乙烯、长烯和ß-雪松烯与氮肥用量呈反比关系。大多数芳香和萜类化合物在150 ~ 225 kg N/ha/年之间含量最高,螨害最低。肯尼亚建议的化肥用量为100至225公斤N/公顷/年,也能产生大多数的螨虫驱虫剂,保护茶树免受虫害。使用推荐的氮肥用量可以保护茶叶免受螨虫的侵扰。发表信息文章历史:收稿日期:15.02.2017修稿日期:21.07.2017收稿日期:01.09.2017 DOI: https://doi.org/10.20425/ ijts.v13i01-02.9985
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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
Pub Date : 2017-08-30 DOI: 10.20425/IJTS.V13I01-02.9986
P. Owuor, M. Obanda
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
长时间的化学枯萎和硬的物理枯萎会降低普通红茶的质量,因为它们会减少总茶黄素的产生,同时促进茶红素的形成。这种质量降低可能因茶树的基因组成而异。然而,补液可以重新激活氧化酶的活性,这些酶负责产生普通红茶的质量参数。研究了对化学萎蔫时间较长的硬物理萎蔫叶进行再水化处理对两种无性系普通红茶品质参数的影响。再水化恢复了硬枯茶品质参数的形成。但由于化学萎蔫时间过长导致的品质劣化不能通过补液来逆转。所用克隆的反应模式是相似的。因此,在普通红茶的加工过程中,应努力将化学枯萎持续时间保持在30小时以下。然而,补液将普通红茶的质量参数通过硬物理萎凋逆转为相当于化学萎凋。发表信息文章历史:收稿日期:02.08.2016修回日期:15.04.2017收稿日期:30.08.2017 DOI:https://doi.org/10.20425/ ijts.v13i01-02.9986
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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
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
National Commission for Science, Technology and Innovation (NACOSTI) and Kenya Agricultural and Livestock Organization-Tea Research Institute (KALRO-TRI)
国家科学技术创新委员会(NACOSTI)和肯尼亚农畜组织茶叶研究所(KALRO-TRI)
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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
Pub Date : 2017-08-10 DOI: 10.20425/ijts.v13i01-02.9980
B. Thuvaraki, M. Ranatunga, J. D. K. Arachchi, V. A. Sumanasinghe
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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
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
The bioactivity of an organic synergist (supplied by the Institute of Pesticide Formulation Technology, Gurgaon, India) was assessed to establish the enhanced efficacy of Neem kernel Aqueous extract (NKAE) and three recommended acaricides such as Fenpyroximate 5 EC, Ethion 50 EC and Spiromesifen 22.9 SC against one of the major tea pest, red spider mite under laboratory conditions. The selected three different acaricides, with recommended doses were tested and their efficacies were compared with that of NKAE. The study revealed that organic synergist enhanced the efficacy of Neem kernel powder (NKP) (even it is @ 2.5% NKP) to the tune of almost 45% and enhanced the efficacy of each acaricides to the tune of almost 20-40% compared to the individual treatments which could be further exploited for reducing the pesticide load on tea.
在实验室条件下,对一种有机增效剂(由印度Gurgaon农药配方技术研究所提供)的生物活性进行了评估,以确定印度楝仁水提物(NKAE)和三种推荐的杀螨剂(Fenpyroximate 5 EC、Ethion 50 EC和Spiromesifen 22.9 SC)对茶叶主要害虫之一红蜘蛛螨的增强功效。选择3种不同的杀螨剂,按推荐剂量进行试验,并与NKAE进行药效比较。研究表明,有机增效剂将印度楝仁粉(NKP)(即使是@ 2.5% NKP)的功效提高了近45%,与单独处理相比,每种杀螨剂的功效提高了近20-40%,这可以进一步用于减少茶叶的农药负荷。
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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
Pub Date : 2017-06-22 DOI: 10.5376/JTSR.2017.07.0007
P. Baruah
India is one of the largest tea producers in the world. In India the state of Assam is a large tea growing belt in the world where the renowned Assam teas grow. The tea was discovered growing wild in Assam by the British. Before the discovery of wild teas the local population of Assam, some of the tribal people, were in the habit of drinking tea in their indigenous method of preparation since time immemorial. Since the early part of the nineteenth century, discovery of ‘wild’ plants of Assam and Cambodia races of tea were recorded. In Assam and the North-East area at present in all the explorations carried out to the original tea areas, hybrids of the three main varieties of tea are found. The true to type original Assam variety is yet to be discovered. Existence of wild tea plants in the forests of Assam has been a subject of much curiosity and collection of such germplasm would greatly assist research on plant improvement by the scientists.
印度是世界上最大的茶叶生产国之一。在印度,阿萨姆邦是世界上最大的茶叶种植区,著名的阿萨姆茶就生长在这里。这种茶是英国人在阿萨姆邦发现的。在发现野生茶之前,阿萨姆邦的当地居民,一些部落居民,自古以来就习惯用他们自己的方法喝茶。自19世纪早期以来,阿萨姆邦和柬埔寨茶种的“野生”植物被发现。在阿萨姆邦和东北地区,目前在对原始茶区进行的所有探索中,都发现了三种主要茶品种的杂交品种。真正的阿萨姆邦品种还没有被发现。阿萨姆邦森林中存在的野生茶树一直是人们非常好奇的话题,收集这种种质资源将极大地帮助科学家进行植物改良研究。
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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
Pub Date : 2017-05-15 DOI: 10.5376/JTSR.2017.07.0006
F. Olajubu
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.
目前在临床和兽医治疗中滥用现有抗生素,导致耐抗生素微生物菌株激增,并积极寻找容易获得、价格较低、副作用很少或没有副作用的替代品。茶和咖啡是尼日利亚每个家庭每天消费的饮料。本研究考察了尼日利亚市场上常见的茶和咖啡的抗菌和抗溶血特性。采用圆盘扩散法测定提取物对人源和动物源病原菌的抑菌作用,采用比色法测定提取物的抗溶血作用。提取物在充分强度下呈微酸性,无抗真菌作用。对金黄色葡萄球菌、白痢沙门氏菌、痢疾志贺氏菌和肺炎链球菌均有广谱杀菌作用。这些活性与浓度有关。对大肠杆菌的活性很差。咖啡的杀菌率为6小时,而茶提取物的杀菌率为18至24小时。茶提取物极大地抑制了α毒素的溶血潜能,而咖啡则表现不佳。因此,茶和咖啡可以作为一些细菌感染的支持性治疗,而不必担心副作用,因为它们是日常饮料。
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引用次数: 2
期刊
茶叶科学
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