Produ??o e qualidade de frutos de laranjeira 'Pêra' em fun??o de fontes e doses de boro

摘要

The aim of this research was to evaluate effects of boron sources and doses in the yield and quality of 'Pera' sweet orange. The treatments were five boron sources (ulexite-powder, colemanite, ulexite-grain, magnesian thermo phosphate with boron and acid boric) and four boron doses (1, 2, 3 and 4 kg ha-1). Experimental design was completely randomized in factorial 5 x 4, with four replications. Eleven months after treatments application crop yield was not influenced by boron source and doses. Fruit technological attributes as ratio, soluble solid contents and oBrix were not different. Orange juice production decreased with boron dose increasing for all evaluated sources. The largest fruit diameter was found under the most soluble source (boric acid) while the smallest fruit diameter was obtained under the less soluble source (colemanite). Treatment influence was not observed to fruit skin thickness.