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acid ammonium sulphate aoid aphids application basal beetles bright grade Bright Leaf Bright Leaf Equivalent chemical chlorine compared crop cured leaf yield cured weight decreased Delcrest Dieldrin differed significantly doses effect farmyard manure fermentation fertilisers flue-cured tobacco flue-cured Virginia tobacco Formothion fungicides germination grade leaf green leaf yield green manuring ground beetles Harrison Special Hicks hybrid increased inoculation insecticides interaction irrigation kg/ha lanka tobacco Leaching leaf curl leaf leaf levels of nitrogen Mean medium grade N/ha Neem cake nicotine nitrate nitrogen number of transplants nursery paddy palisade cells percentage Phosphamidon phosphorus plants plot potassium potassium chloride pots powdery mildew priming Rajahmundry relative resistance replications root-knot S.Em season seed rates seedlings selections significant significantly higher significantly superior soil special occurrences spray storage studies superphosphate tabacum tested tobaooo tonnes/ha topping Total Bright Leaf treatments types uptake Virginia Gold White Gold yields of green