Xu Qing didn't exaggerate. As long as there is fertile land, the normal yield of corn per acre should be around a thousand jin, even after considering the removal of special fertilizers.
If there were quality fertilizers, the yield per acre could even double.
When Xu Qing spoke, he only reported seven hundred jin, and even staple crops like potatoes could only reach ten thousand jin wet weight at best.
Anyway, Xu Qing conveyed the "maximum limit" to Zhu Huai'an; whether there will be opportunities for breakthrough in the future would be an additional surprise.
In summary, if there is extra, it's like adding flowers to brocade; if not, it's still magnificent.
Aside from the corn seeds modified by the Black Raven and Feather Crown People, Xu Qing had other considerations for promoting new crops in Dayan.
When a whale falls, all creatures thrive.