The breeding program Murong Jiu spoke of was exactly what was interrogated from Wang Yingluo after she was poisoned by the Devil Sea Flower.
In their era, the reason for the high grain yield, aside from pesticides and fertilizers, was primarily breeding.
There were even specialized agricultural universities.
As seeds went through generations of breeding improvements, they got progressively better, not only yielding more but also significantly improving in taste.
Take the Cold Melon, or watermelon, for example. Today's watermelons have many seeds; and though they are sweet, they aren't as sweet as in later generations, nor are they sufficiently red. Through improved breeding, they became redder and sweeter, and even larger in size.
Some grains could also be crossbred.
All of these required a long time for improvements.
Murong Jiu thought Lady Jing was an excellent candidate; she could form her own team, dedicatedly focusing on this task.
