Effects of Genotype, Environment and Management on Yields and Quality of Black Tea

Owuor, P.O.; Kamau, D. M.; Kamunya, S. M.; Msomba, Solomon W.; Uwimana, Marie A.; Okal, Amos W.; Kwach, Bowa O.

doi:10.1007/978-94-007-1521-9_10

Cited by 26 publications

(45 citation statements)

References 89 publications

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“…The N in the inorganic fertilizer may have increased the accumulation of amino and fatty acids but reduced the catechins level leading to production of black tea with low TF levels. The decrease in TF levels with increase in NPK fertilizer rates has previously been noted (Owuor et al, 2011).…”

Section: Theaflavin (Tf) and Thearubigins (Tr)supporting

confidence: 53%

“…Fertilizer type and rate did not significantly affect the TR content (Table 5). Previous studies did not also find any effect of fertilizer type and rate on TR level (Owuor et al, 2011). Note.…”

Section: Theaflavin (Tf) and Thearubigins (Tr)mentioning

confidence: 81%

“…Caffeine is an important plain black tea quality parameter responsible for the stimulatory effects (Owuor et al, 2011). The caffeine content varied with fertilizer type (Table 6).…”

Section: Caffeinementioning

confidence: 99%

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Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Tabu¹,

Kekana²,

Kamau³

2015

JAS

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Tea (Camelia sinensis) a major cash crop in Kenya is normally grown on highly weathered and strongly acidic soils. Non-judicial use of the recommended inorganic compound fertilizer 25:5:5:5s acidifies the soil and pollutes water masses. Integrated soil fertility management, the combined use of organic and inorganic fertilizer is recommended for higher tea yield and soil health. An experiment was carried out in the Eastern Highlands of Kenya to determine the effect of different ratios and rates of enriched cattle manure on leaf nitrogen content, yield and quality of tea. Inorganic compound fertilizer 25:5:5:5s led to the highest N level in the mature leaf. Enriching organic manures with inorganic fertilizers increased the yield but reduced the quality. Tea quality parameters Theaflavins (TF) and Thearubigins decreased with increase in fertilizer rate irrespective of fertilizer type. Caffeine content however increased with increasing rate fertilizer especially in the case of inorganic compound fertilizer 25:5:5:5. Enriching organic manures with inorganic fertilizers increased the N content in the mature leaf and crop yield but reduced the quality. The study showed the beneficial effect of enriched manures in tea production.

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Section: Theaflavin (Tf) and Thearubigins (Tr)supporting

confidence: 53%

Section: Theaflavin (Tf) and Thearubigins (Tr)mentioning

confidence: 81%

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Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Tabu¹,

Kekana²,

Kamau³

2015

JAS

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“…This is because they had the highest MPP and MVP values: 7.9 and 1736.5 for SF, 1.3 and 290.4 for FF1 and 3.7 and 806.7 for FF2. Omwoyo et al, 2014;Owour et al, 2011). Clone TRFK 31/8 and clone EPK D99/10 are known to be cold and drought resistant while clone TRFK 6/8 is not and this may explain the unresponsiveness of clone TRFK 6/8 during this trial period which was occasioned by cases of hail, frost and drought.…”

Section: Economic Analysismentioning

confidence: 99%

Economic Evaluation of Foliar NPK Fertilizer on Tea Yields in Kenya

Njogu¹,

Kariuki²,

Kamau³

et al. 2015

JPS

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Economic evaluation analysis of foliar (NPK) fertilizer on tea yields was investigated on three varieties of tea grown in the Kenyan Highlands. Foliar fertilizers trial was setup on three sites, Meru, Kirinyaga and Kericho, comprising of 36 plots per site. Two foliar fertilizer types, Foliar Fertilizer 1 (FF1) and Foliar Fertilizer 2 (FF2), a positive control of Soil Fertilizer (SF) and a blank (FF0) were used to standardize the method. Yield analysis in Meru site showed significant increase (HSD=4.9, p≤0.05) after FF1 full rate application. SF had significant yield increases for all its rates from zero rate (HSD= 49, 44, 19, p≤0.05) for half, full and double rates respectively. FF2 had no yield increase after its application. The economic rates were determined to be full rate for FF1 and SF and half rate for FF2 in Kericho site; half rate for all fertilizer types Kirinyaga site; double rate for FF2 and SF and full rate for FF1 in Meru site. The profitable rates were: double rate for SF across all sites and for FF1 and FF2 in Meru site; full rate for FF1 and half rate for FF2 in Kericho and Kirinyaga sites respectively.

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“…However, yields [8] [9] and quality [10]- [12] are affected by fluctuations in weather factors within and between the years in any one location. Despite production close to the equator, the differences in geographical areas of production have been recorded to influence leaf nutrients levels [13]; growth rates [14]- [17], productivity [18]- [20], precursors of tea quality parameters [21]- [27] and black tea quality [26] [28]- [30] of tea. Despite use of same genotypes and management practices, yields and quality vary across the region.…”

Section: Introductionmentioning

confidence: 99%

Genotype and Environment Interactions of Yields and Yield Components of Tea (<i>Camellia sinensis</i>) Cultivars in Kenya

Nyabundi¹,

Owuor²,

Netondo³

et al. 2016

AJPS

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The tea crop provides income and employment to rural populations in many countries. In Kenya, tea, which is the leading export commodity crop, is grown in highlands east and west of the Rift Valley at altitudes ranging from 1300 m to 2700 m above mean sea level. Variable responses of tea genotypes to different environments have been demonstrated. This affects the growth, productivity, and quality of tea. However, most tea husbandry practices are uniform across tea growing regions leading to variations in yields and quality in the different environments. Understanding causes of variations in tea growth parameters and yields to varying environments is vital to optimizing husbandry practices for maximization of productivity. The responses in growth and yield parameters of clonal tea to locations of production and their contribution to yields were compared. A genotype × environment trial was conducted in three sites (Kangaita, Timbilil and Kipkebe). At each site, a trial comprising 20 cultivars was laid in a randomized complete design replicated 3 times. Yields, yield components and climatic data were collected then subjected to analysis of variance and regression analysis. There were significant (p ≤ 0.05) yield variations between clones and locations. Yields ranged from 5162 kg mt/ha on clone TRFK 303/577 at Kipkebe to 935 kg mt/ha/year on clone TRFK 7/3 in Kangaita, surpassing the maximum variation possible postulated in earlier studies. The responses of the tea yield components to weather parameters varied with genotypes and environments. Shoot growth rates in Timbilil (r = 0.476)) and shoot density (Kangaita (r = 0.652) significantly (p ≤ 0.05)) correlated with yields. Yield components and weather parameters contribution to the total yield also varied with locations. The variations demonstrated that not all yield components can be used universally as yield indicators for clonal selection in different locations. For optimal production, selected tea clones should therefore be tested before adoption for commercial planting in other locations. K. W. Nyabundi et al. 856

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Effects of Genotype, Environment and Management on Yields and Quality of Black Tea

Cited by 26 publications

References 89 publications

Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Economic Evaluation of Foliar NPK Fertilizer on Tea Yields in Kenya

Genotype and Environment Interactions of Yields and Yield Components of Tea (<i>Camellia sinensis</i>) Cultivars in Kenya

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Effects of Genotype, Environment and Management on Yields and Quality of Black Tea

Cited by 26 publications

References 89 publications

Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Economic Evaluation of Foliar NPK Fertilizer on Tea Yields in Kenya

Genotype and Environment Interactions of Yields and Yield Components of Tea (&lt;i&gt;Camellia sinensis&lt;/i&gt;) Cultivars in Kenya

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Genotype and Environment Interactions of Yields and Yield Components of Tea (<i>Camellia sinensis</i>) Cultivars in Kenya