The experiment was carried on a Coto clay (an Oxisol). The effect of four levels of N (0, 57, 170 and 340 kg/ha) and four levels of B (0, 2.3, 4.5, 6.8 kg/ha) were determined using the P.R. 7-65 papaya variety. Treatments were initiated when the transplanted seedlings were three months old, and were repeated every six weeks. The information recorded showed the following results: Increments of N and B levels did not show a marked effect on plant height and stem diameter. Boron tended to be more effective than N in increasing stem height and diameter. The petiole fresh and dry weights increased linearly as the N and B levels were raised. The number and weight of fruits borne on female and hermaphroditic trees increased linearly as the N and 8 levels were raised. The results of the experiment showed that the papaya plant requires a high N and B fertilization rate.
Experiments were conducted at Adjuntas substation in the central mountain region of Puerto Rico to determine the effect of four rootstocks on growth and fruit production parameters of six clones of Valencia orange. Concerning fruit characteristics, the most notable differences among clones were in size, but also statistical differences were found in peel percentage and number of seeds per fruit. Significant differences in juice characteristics among clones were also found. Fruit production was superior for all four clones with Cleopatra mandarin as rootstock.There was significant difference between clones 3164 and 3264 concerning fruit production. There were no significant differences in yield efficiency during the first crop year; however, trees on Cleopatra mandarin and sour orange rootstocks were significantly taller, wider and had larger canopy volumes. Significant differences among different clones within particular rootstocks were found for tree height, tree width, canopy volume, fruit production and yield efficiency.
Four levels of N (0, 57, 170 and 340 kg/ha) and 4 levels of B (0, 2.3, 4.5 and 6.8 kg/ha) were applied to the P.R. 7-65 papaya variety, growing on an Oxisol. Treatments were initiated when the transplanted seedlings were 3 months old, and were repeated every 6 weeks. Increments of N and B levels increased the petiole and fruit contents of these elements. Except at the highest N application, the leaf content of N decreased as the B supplied was increased; the fruit content of all elements, except P, decreased as the fruit matured; the Ca content of leaves and fruits increased directly with the N and B levels supplied to the soil; Mg increased and Mn decreased significantly in recently matured fruits as the N and B supplies to the soil were increased; the N and B levels associated with the highest yield (24 kg/plant) were 1.48% and 64 p/m, respectively; the petioles contained less N, P, Mg and B, and higher Ca and Mn, and about the same K as the fruits; the B, Ca, Mg and Mn contents decreased as the fruits ripened.
The Solo papaya (Carica papaya L.), which is the common commercial papaya in Hawaii, was introduced into Puerto Rico. Its performance was studied at the Fortuna and Isabela Agricultural Experiment Substations of this Station. The plantings comprised hermaphrodite and female trees. No tree of male form appeared. The trees started bearing fruits at a height of little more than 5 feet. When about a year old the average number of fruits per tree was 14.15, of which 2.53 were misshapen. The average weight of the fruits was 0.94 pounds; length, 5.21 inches; girth, 10.97 inches; and thickness of flesh, 1.27 inches. The color of the flesh of most of the fruits was yellow and they had good taste and flavor. The female trees were less productive than the hermaphrodite trees, but had fewer misshapen fruits. The fruits from female trees were relatively heavier and roundish in shape. By the end of 1 year in the field all the trees became severely infected with virus diseases, the south-coast mosaic and bunchy top, and stopped growing and bearing. On the basis of the present study the Solo papaya is not recommended for large-scale commercial production in Puerto Rico. However, interested fruit growers may test its performance on their farms by establishing small plantings.
A search for good chironja clones was performed on several chironja seedlings grown on a Typic Tropohumults soil at the Corozal Agricultural Substation . This research demonstrated that chironja seedlings can be selected for yield per tree, fruit size, number of seeds per fruit, peel weight, citric acid, pH, soluble solids to acid ratio, and quality index. However, the high coefficient of variability for number of seeds, cumulative weight and number of fruits per tree during eight bearings and the quality index indicates that the probability of selecting for these characters is higher than that for fruit size, citric acid, pH, and soluble solids/acid ratio. The study also showed a great variability of the seedlings, following the frequency distribution typical of populations, indicating that in order to maintain uniform populations the chironja must be propagated through vegetative plant tissues, like grafting, instead of by seeds.
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