Spad index for diagnosis of nitrogen status in ‘Esmeralda’ peach

Abstract The objective of this research was to evaluate the technical feasibility SPAD index in diagnosis N status ‘Esmeralda’ peach. field trial, with five rates applied soil (0, 40, 80, 120 and 160 kg ha-1 as urea form) conducted a randomized block design four replications. During years 2014, 2015, 2016 2017, readings were carried out Minolta SPAD-502 chlorophyll meter, leaf middle part, 40 leaves per plot. content determination performed CHN-S Elemental Analyzer. increased linear way response increasing soil. There positive correlation between concentration (0.652; 0.756; 0.762 0.767, p<0.05). can be used for nutritional purpose peach when are taken 13th 15th weeks after full bloom. In range 39 49, indicates is included “normal” class (33 – 45 g kg-1) agronomic interpretation States Rio Grande do Sul Santa Catarina, Brazil.