  Pin-to-liquid discharges are investigated for the activation of liquids
dedicated to agriculture applications. They are characterized through their
electrical and optical properties, with a particular attention paid to their
filaments and self-organized patterns occurring at the liquid interface. We
show how modulating their interaction with ambient air can promote the
production of reactive species in liquids such as H2O2, NO2- and NO3-. The
effects of the resulting plasma activated media are reported on lentils seeds.
