Enhancement of peanut yield in calcareous soil by PDMA
The effect of PDMA on peanut yield was investigated in detail; the results are displayed in Table 1. Peanut plants treated with PDMA, PDMA–Fe, and EDTA–Fe exhibited yield enhancements compared with the control of 30.2%, 33.4%, and 26.1%, respectively. Peanut plants treated with PDMA–Fe had the highest kernel yield, followed by PDMA-Fe and EDTA–Fe-treated peanut plants, with enhancements compared to the control of 38.2%, 33.9%, and 27.1%, respectively. PDMA and PDMA–Fe treatment produced enhancements in peanut yield and kernel yield of 3.3% and 5.8% and 5.3% and 8.7% in comparison with EDTA–Fe treatment, respectively. Moreover, higher plump fruit weights and plump fruit numbers per plant were obtained with PDMA, PDMA–Fe, and EDTA–Fe application. These results indicate that PDMA could significantly promote peanut yields under field conditions.