With an Invincible Immortal Palace, I Save the Three Realms by Farming

A civil engineer quits his job and returns to his village to grow oranges, only to awaken the Ancestral Dragon and put it to work as a miner! He feeds unsold citrus to the divine dragon and earns tens of millions in gold a day, leaving the whole village stunned! Monsters invade? Watch me command the earth's ley lines with one hand and slay evil spirits with the other! From bankrupt farmer to the richest man in the Three Realms: who says farming can't make you an immortal?