I just purchased 42 acres that I want to plant in Texas Tough bermuba. The top 7 or 8 inches of soil seems to be easily tilled. At 8 inches down I find a serious "hardpan". Should I break through this "hardpan" to let the roots grow deeper or leave the hardpan so the water tends to hold at that level where the roots can get to it before it percolates on thru. I don't know how deep the roots really need to go down--nearly impossible to kill bermuda grass. This acreage is between Llano & Brady in central Texas.