Sufficiency Ranges

Table. 1. Sufficiency ranges for creeping bentgrass greens. (Modified from Campbell and Plank, 2000)

Element Category Low Sufficient High Nitrogen (N), % <4.00 4.00 - 5.00 >5.00 Phosphorus (P), % < 0.30 0.30 - 0.60 >0.60 Potassium (K), % <2.20 2.20 - 3.50 >3.50 Calcium (Ca), % <0.25 0.25 – 0.75 >0.75 Magnesium (Ca), % <0.20 0.20 – 0.40 >0.40 Sulfur (S),% <0.25 0.25 – 0.75 >0.75 Boron (B), ppm <3 3 – 20 >20 Copper (Cu), ppm <5 5 – 15 >15 Iron (Fe), ppm <50 50 – 300 >300 Manganese (Mn), ppm <25 25 – 300 >300 Zinc (Zn), ppm <20 20 – 70 >70 Important Ratios: The N:S ratio should be 10 to 18:1. N:S ratios greater 20:1 signify potential sulfur deficiency. The N:K ratio should be 1.2 to 2.2.

Table 2. Sufficiency ranges for  Tifgreen (or Tifton 328) bermudagrass greens . (Modified from Campbell and Plank, 2000 and Snyder and Cisar, 2000)

Element Category Low Sufficient High Nitrogen (N), % <3.00 3.00 - 4.30 >4.30 Phosphorus (P), % < 0.20 0.20 - 0.40 >0.40 Potassium (K), % <1.60 1.60 - 2.25 >2.25 Calcium (Ca), % <0.25 0.25 – 0.50 >0.50 Magnesium (Ca), % <0.15 0.15 – 0.30 >0.30 Sulfur (S),% <0.15 0.15 – 0.65 >0.65 Boron (B), ppm <5 5 – 60 >60 Copper (Cu), ppm <5 5 – 20 >20 Iron (Fe), ppm <50 50 – 500 >500 Manganese (Mn), ppm <20 20 – 300 >300 Zinc (Zn), ppm <15 15 – 200 >200 Important Ratios: The N:S ratio should be 10 to 18:1. N:S ratios greater 20:1 signify potential sulfur deficiency.

Table 3. Sufficiency ranges for perennial ryegrass (Modified from Mills and Jones, 1996)

Table 4. Sufficiency ranges for St. Augustinegrass (Modified from Mills and Jones, 1996)

Table 5. Sufficiency ranges for ’Emerald’ Zoysiagrass (Mills and Jones, 1996)

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