-The objective of this work was to evaluate the effect of magnesium foliar spray on yield performance of soybean (Glycine max) and corn (Zea mays) cultivated in soil with adequate levels of base saturation and magnesium content in Brazil. The field trials were conducted on a Typic Hapludox cultivated with soybean and corn in the 2013/2014 and 2014/2015 crop seasons, respectively. Treatments consisted of Mg rates (50, 100, 250, 500, 1,000 and 1,500 g ha -1 and a control without Mg) applied during the V4, R1, and R5.1 (soybean) or V4 and R2 (corn) phenological growth stages as magnesium sulfate heptahydrate (MgSO 4 •7H 2 O). The SPAD index, leaf Mg content, grain yield, and 100-grain weight were evaluated. The Mg foliar spray increased the SPAD index in soybean and the leaf Mg content in corn. The Mg rates of 540 and 890 g ha -1 increased in 325 and 737 kg ha -1 the yield performance of soybean and corn, respectively, regardless of the phenological growth stages. The Mg application during the reproductive stages increased in 2% the 100-grain weight for both crops. Foliar spraying of Mg improves the yield performance in soybean and corn crops.

Zinc (Zn) is the micronutrient with the lowest availability in agricultural soils, and consequently 50 % of the world's soils present Zn deficient. To test the viability of alternative Zn sources (Zn acetate and Zn oxide) to corn and soybean seed treatments, we ran an experiment using these two alternatives at contrasting application rates (0; 0.25; 0.50; 0.76 and 1.01 g kg -1 ) applied to soybean and corn seeds that were subsequently sowed in sandy and clay soils. We measured: Zn accumulation, dry matter and germination, and analyzed this data using uni (LSD-test) and multivariate analysis (Principal Component Analysis, PCA). Results of the PCA showed that the sandy soil yielded higher dry matter and Zn accumulation than the clay soil. The corn provided higher dry matter while the soybean showed enhanced Zn accumulation and germination. The LSD test showed that corn presented positive Zn accumulation in response to Zn rates in both sandy and clay soil. For soybeans, this effect was only observed in sandy soil, while the clay soil presented decreases in dry matter and germination due to Zn rates. Overall, our findings reveal that both Zn acetate and Zn oxide are viable alternatives for supplying Zn to corn seed treatment in sandy and clay soil, and to soybean seed treatment in sandy soil. We suggest that more research should be undertaken to understand the response of soybean seed treatments to Zn supply, especially in clay soil.