Common bean (Phaseolus vulgaris L.) cultivation is of relevant economic importance for Brazil, since this legume is one of the main Brazilian staple foods. The objective of this study was to evaluate, in two sowing times, the agronomic performance of two bean cultivars according to foliar application of different doses of potassium silicate. Experiments were conducted under field conditions, in the rural area of the city of Assis Chateaubriand, Paraná, Brazil. The first experiment was implanted in August, 2014 (rainy season crop) and the second one was implanted in February, 2015 (dry season crop). A randomized block design was used in both experiments, in a 2 × 5 factorial design, with four replications. The first factor refers to common bean cultivars (IPR Campos Gerais and IPR Tuiuiú) and the second factor refers to the different doses of potassium silicate (0.0, 250, 500, 750 and 1000 ml ha-1). The product used contained 0.9 w/v of SiO2 (90 g L-1 of water) and 18% K2O in its formulation. The agronomic characteristics evaluated were plant height, dry matter weight of the aerial parts, amount of pods per plant, thousand grain weight, and grain yield. Foliar fertilization with potassium silicate did not influence the agronomic characteristics of common bean cultivars. Regardless of foliar application with potassium silicate, IPR Campos Gerais cultivar presented greater plant height, thousand grain weight and grain yield for rainy season crop when compared with IPR Tuiuiú cultivar, which in turn presented higher productivity in dry weather crop.
Key words: IPR Campos gerais, IPR Tuiuiú, silicon.
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