Agronomic traits and vegetation indices of two onion hybrids.

Highlights: [•] Two onion hybrids have differed significantly in their agronomic and spectroradiometric response. [•] The more productive hybrid Cometa presented no significant correlations between yield and VIs. [•] In the late growth stage, onion biomass and yield were highly correlated to nine VIs in Red Mech. [ABSTRACT FROM AUTHOR]