Establishment of Potassium Reference Values Using Bayesian Models in Grapevines

Critical levels (CL) of available potassium (K) in soils and leaves maximum technical efficiency (MTE) doses are relevant information to define the best K fertilization strategies. The aim this study was determine reference values soil, using Bayesian analysis, order maximize grape yield must quality ‘Chardonnay’ ‘Pinot Noir’ grown a subtropical climate. vines were subjected applications 0, 20, 40, 60 80 kg K2O ha−1 year−1. CL MTE K, soils, determined hierarchical models. range probability occurrence 15.8 18.9 g kg−1 16.8 19.1 at flowering. Moreover, 15.3 18.1 16.1 18.2 veraison. In for 27.4 mg it 23.2 kg−1. increase soil increased TSS, while TTA decreased both cultivars after sufficiency rate. estimated Noir’. proposition and/or can help vineyards.