Here is a photo of the tractor and the subsoiler engaging the soil. The subsoiler works to a depth of 24" but does not invert the soil. In fact, when performed properly, subsoiling barely disturbs the surface. Last year's mistakes inadvertantly proved the benefit of subsoiling to me.
Of all the mistakes I made, last year's biggest mistake was making passes 60" apart when passes should be 30" apart. In effect, half the field was subsoiled. Remember the hot, dry summer? The sweet corn stalks that grew over or close to the subsoiler passes were noticeably more vigorous than the stalks that grew between the passes.
Over the winter I also learned how to set up the three point hitch and adjust attachments. The hitch has several adjustments and the most important to a subsoiler is the angle of the tip. A properly angled tip will pull the attachment downward into the soil.
Another mistake I am willing to admit was over inflating the rear tires which reduced traction. Proper inflation of the rear tires is only 14 PSI. I inflated the rear tires to 36 PSI, which is the proper inflation of the front tires.
But correcting all those mistakes, this year subsoiling was performed, almost perfectly.
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