Levels of aluminium in green leaf of clonal teas, black tea and black tea liquors, and effects of rates of nitrogen fertilizers on the aluminium black tea contents

摘要: Abstract Clonal teas have different aluminium content increasing with age of leaf. Although and fertilizer nitrogen enhance tea growth yields, respectively, field trials shown no relationship between total in the leaf clonal yields. Higher concentrations were found dust grades black than large size grades. However, levels decreased liquor from compared to Only up 40% was infused into liquors; amounts varied clones grading (sorting). Aluminium lowered by rates nitrogenous fertilizers, more frequent application, application NPK 20:10:10 as opposed NPKS 25:5:5:5.