Hasselo, H.N.2014-11-182014-11-181965Tea Quarterly36(3)pp.122-136https://dl.nsf.gov.lk/handle/1/12674BiochemistryLeavesNutrient contentsChemical analysisFoliar diagnosisPlant nutrientsThe nitrogen, potassium, phosphorus, calcium, magnesium, sodium, manganese, iron, copper, boron, zinc, molybdenum and aluminium contents of tea leaves of increasing ageA