Welcome to the farmOS forum @Pigeau-alex!
I just wana knox when will you open the inventory for all the assets and inputs.
I have been holding off on doing this, and plan to make it a part of farmOS 2.x, which we are working on now.
I answered this question in a few other forum topics. Here is one, but search for “inventory” if you are curious to find other details.
As inputs, thers fertilizers, but, will it be possible to add a new family like “Mulch” or “Straw” ?
The goal is to have a new “Materials” asset type (the actual name may change). So you will be able to add “Mulch” and “Straw” assets that can be used to represent your current inventory.