Single Digging 

This is the usual way to cultivate and add organic matter to the soil. Spread a layer of organic matter over the whole plot, to be incorporated as you dig. Dig a trench about 12 inches wide, to one spade's depth, across the plot and take the soil to the far end of the plot in a wheelbarrow. Use soil from a second trench, dug next to the first and to the same dimensions, to fill the first trench. Continue the process across the plot, until the soil moved from the first trench is used to fill the last.