Potash and phosphorous fertilizers on black tea quality in the Western Kenya Highlands
1998
Owuor, P.O. | Wanyoko, J.K. | Obanda, M.
Although phosphorous and potassium fertilizer applications are recommended for production of high yields in tea, there were no quality variations arising from application of triple super phosphate or rock phosphate, but increasing phosphatic fertilizer levels significantly improved the levels of thearubigins but reduced the black tea brightness levels leading to insignificant decline in sensory evaluation. Increasing rates of potasium did not have any significant (P=0,05) effect on plain black tea quality parameters and sensory evaluations. When applied together with potasium, increasing nitrogen fertililzer reduced the plain black tea quality and sensory evaluation while potasium rate had no significant effect. Where the application of potassium as straggered with time of nitrogen fertilizer application or time of pruning, increasing rates of potassium had no effect on quality, but staggering the application sporadically resulted in significant variations in theaflavins, total colour and sensory evaluations. These nutrients can therefore, be applied to tea in Kenya for other benefits apart from quality improvements
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