Fruit production of yellow passion fruit (Passiflora edulis Sims. f. flavicarpa Deg.) is affected by several factors, such as climate, soil and agricultural practices, including fertilization and irrigation, which are essential for high crop yield. Thus, an experiment was carried on to evaluate the effect of humic substances and different nitrogen doses supplied through fertigation on fruit production of yellow passion fruit in Brazilian semiarid. The experiment was carried on from December 2012 to December 2013 on Curaçá irrigation area, Juazeiro County, Brazil. The experimental design was randomized complete block in a split plot arrangement, considering humic substances (absence and presence) as main plots and N doses (180, 200, 260, 330 and 350 kg ha-1 yr-1 of N) as subplots with five replications and six plants in each parcel. The interaction of nitrogen doses and humic substances affected foliar nitrogen concentrations, stem diameter, production per plant and yield. No isolated effect of humic substances on any variable studied was significant. The higher yellow passion fruit yields are recorded at 290 and 350 kg ha-1 N doses without and with humic substances, respectively.
Key words: Passionflower, plant nutrition, organic acids.
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