The Ap of a Mollisol has 5% organic matter and a nitrogen mineralization rate of 3% per year. If a corn crop needs 200 pounds of nitrogen per acre-furrow-slice per year, then how much additional N must be added to the corn crop in addition to the N that this Ap horizon can supply? (Assume acre furrow slice weighs 2,000,000 pounds and soil organic matter is 5% nitrogen). 50 lb N None, the Ap horizon alone can supply enough 150 lb N 200 lb N 100 lb N