Table 1.2-9. Typical crop nutrient removal for phosphorus and potassium.

Crop (units) Per unit of yield Typical yield/A Removal for given yield
P205 K20 P205 K20
  1. 65% moisture.
  2. For legume-grass mixtures, use the predominant species in the mixture.
  3. 10% moisture.
  4. Includes straw.
Corn (bu) 0.4 0.3 125 (bu) 50 40
Corn silage (T)1 5.0 11.0 21 (T) 105 230
Grain sorghum (bu) 0.6 0.8 125 (bu) 75 100
Forage sorghum (T)1 3.0 10.0 15 (T) 45 150
Sorghum/sudangrass1 7.0 7.0 15 (T) 105 105
Alfalfa (T)2,3 15.0 50.0 5 (T) 75 250
Red Clover (T)2,3 15.0 40.0 3.5 (T) 55 140
Trefoil (T)2,3 15.0 40.0 3.5 (T) 55 140
Cool-season grasses (T)2,3 15.0 50.0 4 (T) 60 200
Bluegrass (T)2,3 10.0 30.0 2.5 (T) 25 75
Wheat/rye (bu)4 1.0 1.8 60 (bu) 60 110
Oats (bu)4 0.9 1.5 80 (bu) 70 120
Barley (bu)4 0.6 1.5 75 (bu) 45 110
Soybeans (bu)4 1.0 1.4 40 (bu) 40 55
Small grain silage (T)1 7.0 26.0 6 (T) 40 160