influence of different methods of zinc sulphate application (soil drench, injection and spray) on improvement of qualitative and quantitative properties of grapevine (vitis vinifera cv. askari)

in order to investigate the effect of application methods of znso4 on qualitative, quantitative and correction of zinc deficiency in grapevine, an experiment was conducted in completely randomized block design with 10 treatments and 4 replications. treatments included control, trunk injection three levels 1.5, 3 and 5 g/l, spray in three levels 1.5, 3 and 5 g/l and soil application (soil drench) in 75,150 and 200 g/vine. results showed that highest yield 17.81 and 16.39 kg/vine was obtained in soil application of 200 gr/vine and trunk injection in 1.5 g/l, respectively as compared to control with 7.27 kg/vine. trunk injection in 3 g/l concentration increased the berry volume to 3.62 cm3 as compared to control plant. all of treatments increased chlorophyll content as compared to control. also, maximum zinc concentration in leaf was observed in vine’s sprayed with 5 g/l with 127.43 mg/kg dry matter as compared to control with 17.5 mg/kg dry matter. so, the maximum yield was obtained in low concentration of znso4, but optimal concentration of zinc in leaf was observed in plant was sprayed with 1.5% znso4.