Document Type: main article
In order to evaluate growth physiological indices of two hybrids of sweet corn, i.e. Chase and Challenger under deficit irrigation and foliar application of zinc compounds, an experiment was carryout out as the split plot factorial in the form of randomized complete block design with three replications in the experimental field of Faculty of Agriculture, Islamic Azad University of Arak in 2015. Different levels of irrigation pattern included the conventional furrow irrigation (I1), fixed every other furrow irrigation (I2) and alternate every other furrow irrigation (I3) in the main plots and different levels of foliar application of zinc in the sub plots as lack of foliar application of zinc (control, foliar application of water), use of Drop zinc sulfate ( -1 (zn2)), use of Fast zinc sulfate( -1 (zn3))and two hybrids of sweet and super sweet corn. Drought stress in alternate irrigation caused the significance decrease of growth indices such as leaf area index, crop growth rate, net assimilation rate, relative growth rate, harvest index of chlorophyll and carotenoid content, so that the highest leaf area index was observed in the control irrigation treatment by 3.766 against alternate irrigation treatment by 3.334, but there was no significant difference between alternative irrigation and control treatments. The highest leaf area index in fast zinc treatment by 3.868 was significant against the control treatment by 3.539. The results showed that the interactive effect of treatments on the parameters was significant at 1% probability level and the highest leaf area index belonged to I3ZN3V2 treatment (alternate irrigation, fast zinc and Challenger cultivar) by the average of 4.227 and the lowest belonged to I2ZN1V1 treatment (alternate irrigation, without zinc and Chase cultivar) by the average of 3.203 that were significantly different at 1% level.