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We combine simultaneous constraints on stellar evolutionary status fromasteroseismology, and on nitrogen abundances derived from large spectroscopicsurveys, to follow nitrogen surface abundances all along the evolution of alow-mass star, comparing model expectations with data. After testing andcalibrating the observed yields from the APOGEE survey, we first show thatnitrogen surface abundances follow the expected trend after the first dredge-upoccurred, i.e. that the more massive is the star the more nitrogen is enhanced.Moreover, the behaviour of nitrogen data along the evolution confirms theexistence of non-canonical extra-mixing on the RGB for all low-mass stars inthe field. But more surprisingly, the data indicate that nitrogen has beendepleted between the RGB tip and the red clump. This may suggest that somenitrogen has been burnt near or at the He flash episode.

Nitrogen depletion in field red giants: mixing during the He flash?