The Influence of Fertilizers on Pineapple Replant Areas

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Evans, H. R.
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Nitrogen, in the form of sulphate of ammonia at the rate of 2,000 lb. per acre, enables substantially increased yields of pineapples to be produced from the plant and first ratoon crops grown on land where one crop cycle is immediately followed by another. This fertilizer also accelerates fruiting during the early . months of the fruiting season, thus reducing loss of crop as a result of "Black Spot" disease, which may occur in the later harvesting period from July to September. It increases plant vigour and results in a larger number of plants producing fruit. The overall mean fruit weight is also increased. Post-planting soil fumigation with ethylene dibromide at a 10 per cent concentration, one year after planting, can destroy plants and cause a serious suppression of fruiting. When used with sulphate of ammonia at 2,000 ·b. per acre, a favourable positive interaction occurred though fruit suppression was still evident in this experiment.Iron and magnesium sprays at 2 per cent concentration did not produce any significant increase in yields, but magnesium increased significantly the mean fruit weight. When iron was combined with ethylene dibromide a significant yield increase was recorded.
East African Agricultural and Forestry Journal, 22 (No 8), p. 122-126