Actually, Wei Kaiyun's design is quite simple. The rotary cultivator is a central pillar, wrapped with sharp thick iron pieces, and pulled along by a tractor.
As for the seeder, it's also quite simple. It has a central pillar with a few notches on top, which is the seeding area using a drum mechanism.
After Master Yang saw it, he laughed and patted Wei Kaiyun on the shoulder, "I didn't expect you to have researched this?"
Wei Kaiyun felt embarrassed; it was all his wife's idea. His wife's words made it simpler and resulted in this design.
"Xiao Wei, I'll call tomorrow morning. If it's possible, I'll accompany you to return the sprayer and then go with you to get the tractor.
If you can explain the equipment you need over the phone, that would be even better. When you arrive, you can come back with it. If they don't understand, I estimate the machinery factory will be able to make it in a day, so it won't delay any big matters."
