Effects of iron and two nitrogen forms(nitrate and ammonium nitrogen) on remobilization of iron from diferent iron pools in maize plants were studied in a split-root system in nutrient solution under controlled conditions.The results showed that,Fe nutrition status in young leaves of maize was affected not only by Fe pools strength in maize plants,but also by diferent nitrogen forms under Fe deficiency stress.When there was no Fe pool in root system,NH₄-N supply led to 32% of Fe in the primary leaves to be remobilized to young leaves of maize plants,and 40% of Fe in roots with Fe pool to be remobilized.Regardless of root Fe pool,active Fe in new leaves and Fe concentration in xylem sap were increased by NH₄-N application.