Bioestimulante para mitigação do efeito da supercalagem no milho

Abstract

Over-liming can excessively raise soil pH and cause nutritional imbalances that compromise early corn growth. Thus, this study aimed to investigate the influence of lime rates and foliar application of nutrients and amino acids on early corn development. The experiment was conducted in a greenhouse using a factorial scheme with two lime rates(3 and 12 t ha⁻¹) and four foliar treatments (control, MS Cana, Kymon Plus, and MS Cana + Kymon Plus), in a randomized block design with three replicates. Evaluated variables included SPAD index, plant height, stem diameter, number of leaves, plant dry mass, soil pH, and soil electrical conductivity. Data were subjected to analysis of variance, and means were compared using the Tukey test at 5% probability. A significant effect of lime rates was observed on growth variables and biomass accumulation, with the 3 t ha⁻¹ rate outperforming the 12 t ha⁻¹ rate, indicating that excessive pH elevation limited root system and shoot development. Foliar applications did not significantly reverse the stress induced by over-liming. It is concluded that excessive soil pH elevation compromises early corn growth, and under the study conditions, foliar fertilization and amino acid use were insufficient to mitigate the adverse effects of elevated pH.