The present investigation entitled effect of foliar sprays of zinc, iron and boron on flowering and yield of custard apple (Annona squamosa L.) cv. Sindhan was carried out at Department of Horticulture, Junagadh Agricultural University, Junagadh, during the kharif season of the year 2011-12. The experiment was laid out in a Randomized Block Design with three replications. There were eight treatments comprised T1 (0.5% Zinc sulphate), T2 (0.5% Ferrous sulphate), T3 (0.3% Borax), T4 (0.5% Zinc sulphate + 0.5% Ferrous sulphate), T5 (0.5% Zinc sulphate + 0.3% Borax), T6 (0.5% Ferrous sulphate + 0.3% Borax), T7 (0.5% Zinc sulphate + 0.5% Ferrous sulphate + 0.3% Borax) and T8 (control) i.e. water spray. The study revealed that the application of Zn, Fe and B at various concentrations did not significantly influenced days to first, second and third flushes. Numbers of flowers per shoot in first and in second flushes were found non-significant by application of micronutrients at various concentrations. The highest number of flowers per shoot (26.57%) in third flush was recorded with treatment T7 (0.5% Zinc sulphate + 0.5% Ferrous sulphate +0.3% Borax). The treatment T7 gave minimum flower drop (79.70%), highest fruit set (20.30%), minimum fruit drop (12.25%) and maximum fruit retention (87.75%) in third flush. The combined application of micronutrients recorded the maximum fruit yield (20.06) per tree, fruit weight (173.56 g), fruit length (6.86cm) and fruit girth (6.67 cm). In case of quality parameters the treatment T7 was given maximum TSS (16.29), Reducing sugar (14.29 %). The shelf-life of fruit also increased (3.00 days) by combined application of micronutrients.