Accumulation of micronutrition in the kernel following PDMA application
The effects of PDMA on micronutrition in the kernel are displayed in Fig. 6. The Fe content in the kernel was significantly promoted by PDMA and PDMA–Fe treatment, with increases of 36.4% and 47.1%, respectively (Fig. 6a). Compared with the control, the application of PDMA and PDMA–Fe enhanced the zinc content in peanut kernels by 38% and 48.4%, respectively (Fig. 6b). Moreover, PDMA and PDMA–Fe treatment resulted in higher levels of manganese and copper (Fig. 6c, d). The micronutrition in peanut kernel was significantly promoted by PDMA, and the effects were significantly higher than those obtained with EDTA–Fe treatment.