Response of tea quality parameters to time of year and nitrogen fertiliser

Ouor, Philip O; Othieno, C. O.; Robinson, Janet M.; Baker, D. M. H.

doi:10.1002/jsfa.2740550102

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…Mudau et al (2005) reported that the highest total polyphenol concentrations in bush tea occurred when P was applied at 300 kg ha -1 . The theaflavins and thearubigins contents in green tea varied with time of the year with application of 150 kg ha -1 P being the optimum (Owuor et al, 1991). Other quality parameters such as caffeine (Owuor et al, 1991) and free amino acid content (Ruan et al, 1998) in green, oolong and black tea responded positively to P application of 150 kg ha -1 .…”

Section: Resultsmentioning

confidence: 98%

“…The theaflavins and thearubigins contents in green tea varied with time of the year with application of 150 kg ha -1 P being the optimum (Owuor et al, 1991). Other quality parameters such as caffeine (Owuor et al, 1991) and free amino acid content (Ruan et al, 1998) in green, oolong and black tea responded positively to P application of 150 kg ha -1 . Kamau et al (1999) reported that the levels of thearubigins and volatile flavour index were generally high when P was applied at 250 kg ha -1 .…”

Section: Resultsmentioning

confidence: 98%

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Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Chabeli¹,

Mudau

Mashela³

et al. 2008

South African Journal of Plant and Soil

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Chabeli¹,

Mudau

Mashela³

et al. 2008

South African Journal of Plant and Soil

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“…Current research has shown that yields and quality can be improved with fertilization (Mudau et al, 2005(Mudau et al, , 2007, pruning, and application of growth regulators (Maudu et al, 2013). Among these agronomic practices, application of N, P, and K fertilizers was reported to have a pronounced effect on leaf total polyphenol content in Camellia sinensis (Owuor et al, 1991(Owuor et al, , 2000 and in bush tea (Mudau et al, 2005(Mudau et al, , 2007.…”

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confidence: 99%

Response of Phytochemicals in Bush Tea (Athrixia phylicoides DC.) as Influenced by Selected Micronutrients

Vuwani

Nkomo

Ngezimana

et al. 2017

horts

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Bush tea (Athrixia phylicoides DC.) is an herbal beverage and medicinal plant indigenous to South Africa. This study evaluated the effects of micronutrients on bush tea quality. Treatments consisted of single applications of zinc (Zn), copper (Cu), boron (Bo), iron (Fe), and magnesium (Mg) at three levels (50, 100, and 150 mL/L) and a combination of all micronutrients. A control treatment with no spray was also included. Tea samples were analyzed using head space solid phase microextraction gas chromatography linked to mass spectrometry (HS-SPME-GC-MS). A significant change in the metabolite profile of bush tea was noted. Five major compounds were identified (>80% identification probability) namely alpha-pinene, beta-pinene, myrcene, beta-caryophyllene, and caryophyllene oxide. A linear relationship between percentage leaf tissues and treatment levels of micronutrients in bush tea was also observed. The liquid chromatography linked to mass spectrometry (LC–MS) showed no significant qualitative difference between the control and the micronutrient treatments. There were significant quantitative differences between the control and treatments applied at 50 and 100 mL/L and the combination (B + Zn + Fe + Cu + Mg) applied at 10 and 20 mL/L. The application of micronutrients did have an influence on the metabolite quantities as has been reported with most secondary metabolite fluctuations caused by plant–environment interactions. Altering the micronutrient application may be a possible solution in achieving commercial agricultural production of this medicinal beverage.

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Response of some black tea quality parameters to nitrogen fertiliser rates and plucking frequencies

Owuor¹,

Odhiambo²

1994

J Sci Food Agric

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The effects of the rate of application of nitrogenous fertiliser and frequency of plucking (harvesting) on various black tea quality parameters and yields were compared on clone 6/8. High rates of nitrogen application and long plucking intervals reduced the theaflavin content and brightness of black tea liquor. The caffeine content of the black tea increased with increasing rates of nitrogen application but decreased with increase in the plucking interval. The Group I volatile flavour compounds increased with nitrogen application rate and long plucking intervals while the Group I1 volatile flavour compounds and the flavour index decreased. Tasters preferred teas from shorter plucking intervals and low rates of nitrogen application. Yields increased with increasing rates of nitrogen but were lowered by long harvesting intervals. The rate of nitrogen application did not change the distribution of leaf into different standards.

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Response of tea quality parameters to time of year and nitrogen fertiliser

Abstract: A B S T R A C T Though tea production continues throughout the year in

Cited by 12 publications

References 15 publications

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Effects of nitrogen, phosphorus and potassium nutrition on seasonal tannin content of bush tea (Athrixia phyliciodesDC.)

Response of Phytochemicals in Bush Tea (Athrixia phylicoides DC.) as Influenced by Selected Micronutrients

Response of some black tea quality parameters to nitrogen fertiliser rates and plucking frequencies

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