Hazure Zokusei Tsuchi Mahou no Sei de Henkyou ni Tsuihou sareta node, Gangan Ryouchi Kaitaku shimasu!

Ecto, the third son of the Margrave of Glenreed, is given the skill of earth magic during his coming-of-age ceremony. Earth magic is not suited to combat and is a so-called "useless attribute." He is disowned and appointed as the lord of the extremely remote village of Boda. However, thanks to "a certain secret," Ecto has devised a way to use earth magic that ordinary people would never think of! Together with his companions, including his female adventurer party "Advance Wings," he defeats monsters, clears forests, cultivates fields... Thanks to earth magic, Boda Village achieves remarkable development!

(Source: AlphaPolis, translated)