Dairies are currently or have already developed nutrient management plans for the application of manure on crop and pasture lands. This study was initiated to develop ryegrass growth response curves to nitrogen (N), phosphorus (P) and potassium (K) applications. Applied urea-N rates were 0, 56, 112, 224, 336 and 448 kg ha^-1 alone as well as 224-11-83, and 224-22-166 kg N, P, and K ha^-1 to two field sites in 2003 with N split into 3 applications—mid March, June and August. In 2004, the 56 kg ha^-1 rate was replaced with a 2 way split of 896, plus the addition of a 3 way split of both the 672 and 896 N rates (Dairy #1) and also a 2 way split of 672 kg N ha^-1 rate (Dairy #2). The 2-way split of N applications was in mid March and July whereas P and K were applied only the first year. Irrigation or rainfall occurred within 1-2 days after fertilization and soil samples were taken 3-4 days later in depth increments of 0-15, 15-30, 30-60, and 60-90 cms from the 3 replications of the 0, 224, 448, 672, and 896 kg N ha^-1 rate treatments 3 to 4 times per year. Between 8 and 12 forage harvests were taken from the two sites each of the two years. Yield responses were 4500 and 6000 kg DM ha^-1 for the 448 and 672 kg N ha^-1 rate in 2003 and 2004 respectively at Dairy #1 and 3500 and 4000 kg DM ha^-1 for the 448 and 672 kg N ha^-1 rate in 2003 and 2004 respectively at Dairy #2. Soil nitrate-N concentrations in the 60-90 cm depth seldom exceeded the 10-15 mg kg^-1 level.