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The purpose of this investigation was to establish the possible effect of plucking criteria on the quality of black tea produced with different levels of nitrogen fertilization. Increases in leaf age (norms) resulted in increased total chlorophyll in fresh green tea leaves. Increases in levels of ammonium sulphate fertilization also increased chlorophyll. Chlorophyll responses were similar for processed black tea. Black tea had a much lower total chlorophyll content than fresh green leaves when expressed on the same fresh mass basis. The manufacturing process therefore caused some chlorophyll breakdown. An organoleptic evaluation showed that the infusion of the black tea was constantly 'bright' at all nitrogen (N) levels for bud + 1 and second leaf. The older leaves were mostly 'dull'. These results follow the same pattern as those with increased chlorophyll content. The 'grassy' taste of the liquor was positively related to increases in chlorophyll content as well as to increases in leaf age (norm). Total chlorophyll content was higher in machine-plucked than in hand-plucked tea leaves.Die doel van hierdie ondersoek was om die moontlike effek van pluknorme by verskillende stikstofbemestingspeile op swart tee gehalte vas te stel. Toenemende blaar ouderdom (norme) het die chlorofiel in vars groen tee blare verhoog. T oenemende peile van ammol)il,lmsulfaat bemesting was ook verantwoordelik vir die verhoging van chlorofiel. Die chlorofiel reaksie was soortgelyk in geprosesseerde swart tee. Vir dieselfde massa vars groen blare, het die swart tee 'n baie laer totale chlorofiel inhoud gehad. Vervaardiging was dus verantwoordelik vir chlorofiel vernietiging. In 'n organoleptiese evaluering van die infusie van swart tee was gevind dat dit konstant 'helderder' was by aile stikstof (N) peile vir groeipunt + 1 en tweede blaar. Die ouer blare was deurgaans 'dof'. Hierdie resultate volg dieselfde patroon as die toenemende chlorofiel. Die 'grassmaak' van die tee ekstrak het toegeneem met toenemende chlorofiel inhoud en met toenemende blaarouderdom (norme). Die chlorofiel inhoud was hoar in meganies-geplukte blare as in handgeplukte blare.

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