In addition, there has been a renewed interest in using manure, poultry litter and other organic fertilizer forms to supply not only N, but also phosphorus (P) and potassium. Before applying, be sure to analyze the source for nutrient content. Typically, if these sources are applied to meet the nitrogen needs of the crop, an overapplication of P will result. For this reason, the rate of application should typically be based to meet the crop's P requirements rather than the N requirements for the year of application. Another possibility is to apply N requirements for the year, but remember that there is sufficient  P for a few years.


If using animal manure, Fernandez cautions producers to make sure it is incorporated into the soil, and follow the time of application guidelines discussed for commercial nitrogen management.