T.H.Tay

Abstract

Growth and crop responses of the Singapore Spanish cultivar to five level of nitrogen (0-612 kg N ha^-1) and six levels of potassium (0-1,120 kg K₂O ha^-1) were studied.The greatest growth response to applied nitrogen was recorded in the 0-336 kg N ha^-1 range. With potassium treatments, no significant effect on the plant height was observed during the first six month of growth. Subsequent to this period positive response in the plant height to applied potassium was recorded up to 896 kg K₂O ha^-1. Increasing potassium application beyond 448 kg K₂O ha^-1,however, did not cause any further increase in leaf production . Increasing apptication of nitrogen up to 672 kg N ha^-1 resulted in a positively quadratic response in the mean fruit weight and a negatively linear response in the frutt quality. With potassium application up to 1,120 kg K₂O ha^-1 a positive and quadratic response was recorded for both the meanfruit weight and quality. No interactions between the elemental fertilizers were found.

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