Abstract
Studies were conducted in the Dominican Republic during two years on adult 'Keitt' mango (Mangifera indica L.) fields to examine the long-term effect of chemical and organic fertilization programs on marketable fruit yield. The treatments were: a) 1.8 kg 15-15-15 per tree, once a year; b) 1.1 kg 15-15-1 per tree, twice a year; c) 1.4 g 15-15-15 per tree, once a year; d) 1.8 g 15-15-15 per tree, once a year, plus 13.6 kg compost/tree; e) 1.1 kg 15-15-15 per tree, twice a year, plus 13.6 kg compost per tree; and f) 1.4 kg 15-15-15 per tree, once a year, plus 13.6 kg compost per tree. The results indicate that the application of 1.8 kg 15-15-15 per tree, once a year, plus 13.6 kg compost per tree, and 1.3 kg 15-15-15 per tree, twice a year, plus 13.6 kg compost/tree improved marketable fruit number during both harvest years. The addition of compost for two years increased fruit number by averages of 17 and 24% in comparison with the same treatments without compost.
