All the treatment combinations yielded significantly higher compared to the control. The yield response to nitrogen was linear. The level of nitrogen at 50.4 kg ha^-1 yielded significantly higher than the levels of 33.6 to 44.8 kg ha^-1 with no significant differences between N treatments up to 44.8 kg N ha^-1. No deterioration of the visual quality of the cured leaves was observed at 50.4 kg N ha^-1. No significant yield difference was detected between the different levels of potassium. The best treatment combination was a1 39.2 kg N ha^-1 and 168.1 kg K₂O ha^-1 which approximated to the value obtained from differentiation of the multiple regression equation.

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