Hello,
I don't know if this is the place to post or rather in General Discussions.
But because this is under investigation I want to contribute with my observations from my game.
Maybe this can help.
A few screenshots from the statics menu to show the evolution of the production.
So I managed to have already a good production and a surplus of +1 only having 3 Fams to produce Dung and 8 Fertilisers Works.
Cheers,
Katje-Katrien