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.

Floral management using the growth regulator paclobutrazol may be an alternative for promoting the uniformity of flowering and fruiting in West Indian cherry (Malpighia emarginata D.C.) plants. However, the effects of its use on fruit quality are still unknown. This study aimed to evaluate the effect of paclobutrazol doses on the fruit quality of M. emarginata. The experimental design was randomized blocks, in a 2 x 5 factorial arrangement, with three replications and three plants per plot, with the studied factors consisting of two M. emarginata cultivars ('Junko' and 'Flor Branca') and five paclobutrazol doses (0, 0.4, 0.8, 1.2 and 1.6 g a.i. m-1 of canopy diameter). The following variables were evaluated: fruit mass, fruit transverse and longitudinal diameters, pH, soluble solids content, titratable acidity, soluble solids/titratable acidity ratio and vitamin C content. The use of paclobutrazol, to some extent, promoted the increase of fruit mass, longitudinal diameter and soluble solids contents. The 'Junko' cultivar presented a higher vitamin C content than that for 'Flor Branca', and the maximum vitamin C contents were obtained with the paclobutrazol doses of 0.64 and 0.81 g a.i. m-1, respectively for the 'Junko' and 'Flor Branca' cultivars. None of the studied factors promoted differences for pH and fruit acidity.