Table simulates the effect of Cu II and Fe III addition in soil on the formation of [Zn(PDMA)] -complex in waterlogged (Eh = -300 mV) and aerated (Eh = +350 mV) soils. In low Eh and acidic solution, the formation of [Zn(PDMA)] -complex is consistently reduced by Cu II and Fe III addition, reaching a reduction of 99 % even when the concentration was double respect to Zn II . At pH 7 and 9, the increase of metal ions concentrations has little effect on [Zn(PDMA)] -complex formation. The maximum reduction observed is 15% when the Fe III concentration was multiplied by 50. This is because, as mentioned before, the reduced forms of copper and iron cannot compete with Zn II . In oxygenated soils, the opposite behaviour is observed. At all tested pH, the increased concentrations of Cu II and Fe III drastically reduce the complexation of Zn II by PDMA from 18 to 99% for Fe III and 100% for Cu II addition, highlighting their great competition against Zn II . These results highlight high stability of [Zn II (PDMA)] -complex suggesting the suitability of PDMA application as Zn II fertilizer in submerged and alkaline paddy soils. Considering that these are the main conditions causing Zn II deficiency and also that about 75% of rice is produced under submerged (anaerobic) conditions , the application of PDMA as fertilizer can significantly contribute to reduce Zn II deficiency in paddy soil.