Some Physiological Responses of Black-Eyed Pea to Iron and Magnesium Nanofertilizers

Key players in photosynthesis, iron (Fe) and magnesium (Mg), in nano and common forms were considered for foliar application of black-eyed pea. Factorial experiments in three replicates were designed based on completely randomized blocks containing Fe (0, 0.25, and 0.5 g L-1; in two forms: nano and common) and Mg (0, 0.5 g L-1 nano, and 0.5 g L-1 common). The elements were applied 56 and 72 days after sowing over the leaves, and data were collected after day 85. Iron had significant effect on yield, leaf Fe content, stem Mg content, plasma membrane stability, and chlorophyll content. The greatest effect was obtained by two treatment combinations of 0.5 g L-1 common Fe + 0.5% nano-Mg and 0.5 g L-1 common Fe + 0.5 g L-1 common Mg. In general, almost all analyzed traits were improved by foliar application of these two elements, probably as a result of more efficient photosynthesis.