There are several different types of FSA loans as I'm sure that you have learned. The one that I know of that you can get the super cheap interest on is the 5-45-50 program to buy land. You put down 5% of the purchase price, a "commercial" bank lends you 50% at their rates and the gov't will lend you the remaining 45% at 1.5% fixed for 20 years.
There are also direct loans for people who can't qualify for loans from a commercial for land or operating (including capital purchases). I'm not sure what the terms are for these.
Third is a guaranteed loan. This is where you get a loan from a commercial bank and if you stiff them the gov't will make up 90% of their loss after they sell you out.
All of these programs have a bunch of paperwork involved, but for the cheap money a lot of people are willing to deal with it. Also these are targeted to beginning/disadvantaged/troubled farmers. Generally if you can get credit from a commercial bank you won't qualify for the FSA programs. Their whole reason for existing is to help the bottom x% of farmers get back on or get on to their feet-in theory.