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acre 1969 Yield acre 1970 Type Ammonium sulphate analysis assessments Benlate Blister Blight BSc Cey Calcium ammonium nitrate cankers Ceylon Chemical chloropicrin Clonal testing clones TRI 2023 crops dhool difference in yield Diuron eelworm effect Endrin Estate Fernando fertilizer applications Field foliar spray fumigation fungicides Gramoxone growth heptachlor infestation Kottawa Last pruned Yield lb Ammonium sulphate lb made tea lb per acre leaf levels of nitrogen Linuron loppings Low-Country Station methyl bromide Mid-Country Station months Mulching nursery nutrient phosphate plots plucking Plyac polyphenol potash potassium presented in Table randomized blocks Ratnapura rehabilitation replanting replicates Research roots second cycle Seedling tea area Selvendran shot-hole borer significant differences significantly Silva soil St Coombs St Joachim sulphate and urea tea per acre tea plants theaflavin thearubigins three levels Treatments Yield types of nitrogen urea VP tea wither Yield per acre Yield response young tea Zinc sulphate