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. N credits from organic matter, legumes, manure and sludge are seldom used to reduce N rates and seldom accounted for when calculating crop needs. N credits for organic matter, legumes, manure and sludge are not used to reduce N fertilizer rates or accounted for when calculating plants needs.