Effect of foliar spraying with liquid organic fertilizer, some micro-nutrients, and gibberellins on leaf mineral content, fruit set, yield, and fruit quality of “Hollywood” plum trees

摘要

This investigation was carried out during 2007 and 2008 growing seasons on “Hollywood” plumtrees, grown in loamy clay soil condition at Sendyon village, Kalubia governorate, Egypt; Aiming tostudy the effect of foliar sprays with Aminofert (20% Amino acids, 12% organic acids, and 3.6%chelated micro-elements), gibberellins, and a mixture of chelated (Fe, Zn, and Mn) alone or incombination (GA3 + Aminofert or GA3 + a mixture of chelated “Fe, Zn, and Mn”)on fruit set, yield,fruit quality, and leaf mineral content. Treatments increased significantly fruit set, yield as weight;or number of fruits/tree, as well as, fruit characteristics (Firmness, TSS, Flesh thickness, andAcidity) were improved under all treatments as compared to the control. Gibberellins or Aminofertalone or in combination (GA3 + Aminofert or GA3 + a mixture of chelated “Fe, Zn, and Mn”) appliedto foliage caused a pronounced increase in leaf N, and K content; while Leaf P content decreasedin both experimental seasons. As for micro-nutrients concentration, the data indicated that theconcentration of Fe, Zn, and Mn was icreased in all treatments comparing to the control.Application of Aminofert at 0.25% + GA3 at 20 ppm was more effective compared to othertreatments in the two seasons.