Without artificial fertilizer but I recall reading that they massively improved yields from 1000-1500, let alone a span of 4000 years. Why make "artificial fer

Without artificial fertilizer but I recall reading that they massively improved yields from 1000-1500, let alone a span of 4000 years. Why make "artificial fertilizer" a goalpost? Yield is what matters, there's apparently a million things that go into improving rice paddy yields.