The objective of the research was study the influence of nitrogen fertilization, and three forms of boron application (without boron, boron in the soil and boron on the leaves), on the productivity and the number, average weight, diameter and length of the fruits, as well as on the growth and diameter of the branches, on the percentage of borne. Four doses of N (0, 100, 200 and 400 g plant-1) were applied.The urea and boric acid were used as N and B source, respectively. The nitrogen and boron fertilizations enhanced the productivity and the number of fruits. No variation was observed either in the diameter or length of fruits. The average fruit weight varied in function of the N. The nitrogen fertilization increased the fruit yield. Neither nitrogen fertilization nor the method of B application affected the percentages of borne and split fruits.
sugar apple; plant nutrition; boric acid; urea
