The 36 month, 0% deal is an interest rate buy-down. It's definitely a good thing to do if you don't want to part with all the dough at once and it won't cost you anything if your smart with your money, but a cash only price will probably be lower. If you're not smart with your money - pay cash!
Ex.
I got a "deal" for a net-price of $15,200 for a 2320 from Dealer A with 0% financing for 36 months.
Dealer B gave me a better deal - $14,200 for the same tractor (and it probably was the same tractor!!) CASH only. If I did the 0% deal it would have been $15,200.
I did the math on this (I used to be an accountant) and guess what? The present value of the money I'd earn by keeping the $15,200 in the bank at 5.3% and paying the loan back from that same account totaled $1,000, so my true net tractor price is the same whether I pony-up $14,200 now or dribble $15,200 out over time. The better my interest rate, the better I do and 5.3% is pretty conservative - I can get CDs that pay better than that over the life of the loan.
Of course, the opposite is also true - if I earn 0% by spending the money on beer and taking the monthly tractor payment from my monthly paycheck, it's not such a good deal - I paid a grand more than I would have if I'd just ponied up the dough and took the monthly beer payment from my monthly paycheck.
Anyway, to Deere's credit (pun intended), since the net price of the tractor is the same (or favorable to the buyer) in either case, they really are friendly financiers.