Investigating the effects of lead contamination and foliar application of iron on some physiological characteristics in two forage corn (Zea mays L.) hybrids in calcareous soil

To investigate the physiological traits of corn in terms of lead contamination with iron spray، research factorial completely randomized design with three replications was conducted in the greenhouse. The treatments consisted four levels of lead (zero، 100، 200 and 400 mg kg-1 of soil)، two hybrids of maize (SC260 and SC704) and four foliar applications of iron sulfate (0، 0. 2، 0. 4 and 6%). Lead reduced the root volume، shoot height، shoot and root dry weight. Results showed the shoot of iron concentration increased in each of the levels of lead، with increased foliar concentrations of iron. The highest membrane stability index (88. 54%) of the 260 varieties of non-contaminated soil treatment and foliar composition of Fe 2 per thousand، the lowest value (42. 69%) of the 704 varieties treated with a combination of 400 mg Pb kg and 6 in thousands of foliar Fe was observed. Results showed that in terms of lead contamination، spray iron in low concentrations (2 and 4 per thousand) had a positive effect on the parameters studied. The results obtained in this trial، 704 compared with 260 varieties showed greater sensitivity to lead contamination.