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4 <br />• Table 1. Mechanical and fertilizer treatments (manipulations) <br />of the soil and spoil. <br />Code Description of treatment <br />D Disk spoil before soil replacement <br />DF Disk and fertilize spoil before soil replacement <br />R Rip spoil to a depth of 60-90 cm before soil replacement <br />RF Rip spoil to a depth of 60-40 Cm and fertilize before soil <br />replacement <br />RD Rip soil and spoil to a depth of 30 cm below the soil-spoil <br />interface after soil replacement. <br /> Twenty treatments in all with all possible combinations of 4 soil <br />• thicknesses (15, 30, 45, and 60 cm) and 5 manipulations. <br />• <br />