Stosujemy obornik w dawce 20t/ha :
Potas: 1kg 138,2mg
20000kg X
X = 2764000mg = 2764g = 2,76kg
Fosfor: 1kg 136mg
X = 2720000mg = 2720g = 2,72kg
Miedź: 1kg 0,82mg
X = 16400mg = 16,4g = 0,0164kg