Abstract

Several varieties of rice which have been found to be consistently resistant in the International Blast Nurseries for eight to ten years and which have performed well in local blast nurseries are recommended for use in breeding programmes for blast resistance.The performance in Malaysia of selected improved varieties from eight countries are also reported.

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W.H.Lim

Abstract

In vitro studies showed that E. chrysanthemi was unable to survive in unsterilized peat soil but could survive in unsterilized mineral soil for 7 days. When these soils were sterilized however, the pathogen could survive in both for a1 least 18 days, although the percentage recovery was higher for the mineral soil. Direct soil isolations of the pathogen from infected pineapple fields (peat) were negative.

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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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