rule of thumb 10-15HP per row depending- hills, fert, no till, planter wt, speed
WOW WOW pay attention my man! My father and I purchase a 2955 a couple of years ago, we have a small farm with sandy soils so when thinking of horsepower requirements and what it usually takes to pull somthing around here is usually less than other parts of the country. The 2955 we purchase was a 1991 one owner with 3400 hrs, the retireing farmer that we bought it from used the tractor for everything from tillage to planting on this 200 acre farm for the last 3-4 years. He would pull a 5 bottom plow, also conventional 12 ft seed drill with 12 ft disk in front too, but the tractor was in good shape and didnt even looked like it had a hard life. We used the tractor for a couple of years and then all of the sudden one season the gears started grinding and then before the season could end we lost one of the gears!
Brought it to the John Deere Dealer to take it apart and look at it, what happen pretty much is that the transmission cooling system failed, and the transmission had to be rebuild, with a bill of 12,000,000! The mechanics pretty much said that the tractor was not build for years of heavy tillage and use like that. The 2955 just is build has heavy duty as the comparabile horsepower tractors of the past. Your 3020 is a more heavy duty built tractor than the 2955. The mechanics describe the 2955 as a kind or little supup utility tractor. I would suggest that the 2955 with 85 horsepower on the pto and only about 75-73 on the draw bar should not be used more than a light 15 ft seed drill at the most and maybe you can use a 8 row with out fertilizer boxes to be on the safe side...
We are currently looking for a heavier duty horsepower tractor to do our tillage.