Jiang He might have transmigrated to a world of Qi and martial arts, but the System that he got only provided him with... seeds. 
"Hold on, System. Aren't these just... peas? Not only are they inedible, but I'm supposed to throw them far, far away?" 

Everybody is Kung Fu Fighting, While I Started a Farm

Without any Saints obstructing, the entire Demon Realm was soon emptied.

Every last Demon corpse above Golden Immortal was dumped before Jiang He, piling into a hill.

Jiang He waved his hand, throwing the bodies into the space of the world in his body, and they were soon shining as they started to 'sprout.'

Working like clockwork, Jiang He threw every treasure obtained from the Demon Realm into the world in his body.

Soon, Dumbo and the others returned.

"The Demon Realm has been emptied, Master!" Trumbo reported.

Jiang He nodded in satisfaction, and put every Demi-Saint elite from Dumbo, Trumbo and the Stoner Patriarch into the world in his body, and flew beyond the Demon Realm…

He looked down upon the realm from the cosmic reaches beyond, and noticed that the grant Demon Abyss was like a blackhole, with endless Demonic Qi puffing out of it like black smoke.

I Would Be An Eternal In A Thousand Years (End)