All N is applied in the spring. Most of the N is applied on the surface of the soil. Some N is applied in the fall. All N is applied in the fall. These are examples only.
All P is applied in the spring.
All P is applied in the spring. Some P is applied in the fall. All P is applied in the fall. N credits N credits from organic matter, legumes, manure and sludge are frequently used to reduce N fertilizer rates while still meeting the plants needs. N credits from organic matter, legumes, manure and sludge are sometimes used to reduce N rates and are accounted for when calculating plants needs.