yield and yield components of grape (vitis vinefera cv.peykani) as affected by foliar application of zinc, humic acid and acetic acid

abstract balanced nutrition and soil organic mater are among most important factors affecting yield and quality of grape (vitis vinifera cv.peykani). humic acid as an organic acid derived from humus and other organic sources, in accompany with zinc, and acetic acid can reduce deficiency symptoms in grape. to study the effects of zinc, humic acid and acetic acid on yield and yield components, an experiment with 8 treatments and 3 replications in a randomized complete block design was conducted. treatments included zinc(0 and 0.005 ), humic acid (0 and 0.003), and acetic acid (0 and 0.01). results showed that all treatments increased yield compared to control significantly (p<0.05). the highest yield (13.58 kg per plant) was obtained from zinc, humic acid and acetic acid treatment, while the lowest yield was obtain from the control (5.3 kg per herb). leaf analysis results showed the effect of foliar application treatments was significant. combined application of zinc and acetic acid increased zinc concentration of leaves significantly compared to control. combined application of humic acid and acetic acid increased fe concentration of leaves significantly (p<0.05) compared to control. application of zinc decreased p concentration in leaves significantly (p<0.05) compared to control.