It is much better to deep-plow for gardens and pastures first, using a plow meant for the purpose. There are exceptions. If the soil has been plowed properly recently, it may still be loose enough to get the results you want with a disc plow. It will also help if you can catch the soil moisture right. You want the soil to crumble smoothly in your hand, not pack into a tight ball. As a general rule, drier is better than wetter with a disc harrow. You'll know right away if the soil is too wet; it will pack itself tightly between the discs. Generally, though, a disc plow light enough to be handled by this class of tractor is intended for breaking up larger dirt clods that have already been loosened by a plow meant for that purpose, not preparing tightly-packed ground for seeding. It will tend to run along the surface of the ground, instead of digging into it more than an inch or two, and in order to promote rapid root growth, you want the soil loose to a depth of a foot or more. Good luck. Keep us posted.
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