effect of foliar application of micro nutrients on physiological growth indices and total dry matter yield of forage corn

in order to evaluate the effect of foliar application of micro nutrients on physiological growth indices and total dry matter yield of forage corn. field experiment was conducted in 2006 at bersian village isfahan. a randomized complete block design with four replications was used. plant treated with 8 foliar application treatments (fe, zn, cu, mn, fe + mn, cu + zn, fe + mn + cu + zn and control). the responses to foliar application in total dry weight, lai and cgr appeared to differ between the treatments, but there is no significant difference in nar between the treatments. maximum leaf area index gained in foliar application of fe but there is significant difference between this treatment and other treatments except foliar application of zn and fe + mn. foliar application of fe and fe + mn result to maximum total dry weight, but there is no significant difference between these treatments and foliar application of zn, mn, mn + cu and fe + zn + cu +mn. maximum and minimum nar gained in foliar application of mn and control treatments respectively. maximum cgr gained in foliar application of zn, there is significant difference between this treatment and others. control treatment in comparison with others shows minimum value in all measured factors. the results indicate that foliar application of micro nutrients particularly fe and fe+mn may be suitable to product maximum total dry matter yield under similar condition.