While this is a non method, u wanted data, so here goes:
It depends on the pesticide (milligrams per kilogram, according to a skim read of the paper)
PS: This is likely data from rats, which might not align for humans, and doesn't mention how painful death will be:
View attachment 188002
PS 2: I think salt is there for reference, and *yes* salt can be used to poison the land for long periods of time, and too much salt can be toxic to ppl too, just not a pleasant way to go.