TractorData.com Belarus 250AS tractor information
Your tractor is 58" wide with R1/ag tires, 31 horsepower and around 5,000 pounds.
You would be better served with a 60" wide, PTO powered roto-tiller in a garden, rather than a Moldboard Plow. Plows take many hours to learn to adjust correctly. In a garden you do not have enough space for plow trial and error. If you get a plow, you will also need a Disc Harrow to reduce the 12" to 14" plow furrows to reasonable smoothness, and Disc Harrows are less than optimum in garden situations. A roto-tiller is an all-in-one garden implement.
VIDEO:
PTO tiller - YouTube
How dry was your soil when you lost traction pulling the Middle-Buster? I expect your answer will be
DRY. In ag, you have to wait on Mother Nature. Even your relatively heavy tractor is going to have a hard time pulling through adobe brick. Wait on the Middle-Buster until after three to four days of steady rain, then a day or two of dry out weather.
Cultivators only penetrate 4" - 5" into the soil, so draft force resisting the tractor is not high. Your Belarus 250AS should allow you to pull a two row cultivator in moist soil. Most people using two row cultivators would be growing food for market sale, not for the table.
WHAT DIMENSIONS ARE YOU PLANNING FOR YOUR GARDEN? WHAT USE WAS MADE OF THE LAND, WHICH YOU NOW SEE AS YOUR GARDEN? PASTURE?
A 1/4 ACRE GARDEN IS ALL A FAMILY CAN MANAGE WITHOUT THE GARDEN BECOMING AN ONEROUS TASK RATHER THAN A PLEASURE.
Many would cultivate a kitchen garden with a Middle-Buster plus Roto-tiller for soil preparation, then hand tools or a small gas powered tiller, such as a Mantis, for cultivation.
LINK:
3 Pt. Hitch, Toolbar, Cultivators, Sweeps, S-Tines, Disc Hillers, & More!