Weegy: 1) The earth's atmosphere consists of 78 percent nitrogen and is the ultimate source of nitrogen. In most areas of the world, the nitrogen found in soil minerals is negligible. [ Nitrogen may be added to or lost from soil by a number of processes (see Figure 1). In the soil, nitrogen can undergo a number of transformations.
2)Rainfall adds about 10 pounds of nitrogen to the soil per acre per year. The nitrogen oxides and ammonium that ... (More)