Enhancement of Fe availability by PDMA in the rhizosphere
of peanut
The effects of PDMA on the Fe levels in peanut plants and the peanut
rhizosphere are shown in Fig. 2. Plants treated with PDMA and PDMA–Fe
displayed higher active Fe concentrations in young leaves, increased by
54.5% and 48.7% compared with the control, respectively, and these two
treatments produced slightly higher results than did treatment with
EDTA–Fe (Fig. 2a). Moreover, PDMA and PDMA–Fe significantly enhanced
the level of available Fe in the rhizosphere by 25.5% and 19.1%,
respectively; in contrast, Fe availability in the rhizosphere was not
influenced by EDTA–Fe (Fig. 2b). The results above indicate
improvements in the availability of soil Fe and Fe nutrition in peanut
plants grown in calcareous soil due to PDMA or PDMA–Fe treatment.