These results are in line with the plant results shown by Suzuki et al. , where in nonwaterlogged and alkaline soils, the fertilization using unchelated PDMA significantly increases rice Fe III and Cu II concentrations with respect to Zn II . Nevertheless, when the PDMA was provided to the soil as [Zn(PDMA)] -, the uptake of the Zn II and consequently its concentration in rice plant significantly increased, confirming the good stability of the [Zn(PDMA)] -complex and its effective application to increase Zn II uptake. However, Suzuki et al. also highlighted that when the PDMA was provided to the soil as [Zn(PDMA)] -, some of the complexes Zn II exchanged with Fe III , increasing the Fe concentration in plant. This result is well in agreement with the higher logK value of Fe III with respect to Zn II .