The best time to put this in is before you plant
You do not need a system to start farming. But a season you farm without records is a season you cannot compare against, and that is gone for good.
Start with it
- Your history builds itself, season by season, without anyone typing it up.
- By your second harvest you can compare, because there is something to compare to.
- Costs get recorded while you still remember what they were for.
Add it later
- Someone has to reconstruct it, usually from notebooks, receipts and memory.
- The seasons before it went in stay a blank, so trends start from today.
- It is the same work, done the hard way, at the point you are busiest.
It works the same whether you are clearing your first plot or running established blocks. Earlier is simply easier.