I Am Invincible by Cultivating Myself in Cthulhu by Farming.

Chen Dong traveled through the world of cultivation and was sent to the sect by his family to find out the false four spiritual roots. He was then expelled from the sect and family, and returned to his hometown to make a living. After the third day of farming, he started the most powerful farming system! "A blade of grass can kill the sun, moon and stars!"