Abstract
Abstract Fertilization of field grown roses, R. hybrida cv. Christian Dior, in south Florida with fertilizer packets and tablets was compared with a proven plastic mulch method of reducing fertilizer losses. Flower yields for the 3 methods were similar during the first 9 months of the study. In the second year, comparatively low yields were obtained with tablets, and the highest yields with the plastic mulch. The packets gave intermediate results, with 5 packets providing acceptable yields. Twenty-one months after placement, the tablets contained 56, 56, and less than 0.1% of their original N, P, and K, respectively. Nitrogen release at this time appeared comparatively slow. Considerable variation in nutrient content existed among packets 21 months after placement, with an average of 17, 33, and 38% of the original N, P, and K, respectively, being found. The packets still appeared to be releasing fertilizer at that time.
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