Deficient

Marginal

Satisfactory

Excess

Mineral % of DM of fresh grass prior to silage making
N% <2.0 >4.0
P% <0.20 0.20-0.25 0.25-0.45 >0.45
K% <1.80 1.00-2.20 2.20-3.00 >3.00
Mg% <0.10 0.10-0.20 0.20-0.30 >0.30
S% <0.15 0.15-0.20 0.20-0.30 >0.30
Na% <0.15 0.15-0.20 0.20-0.40 >0.40
Critical Ratios
N: K >1.7 1.3-1.7 0.9-1.3 <0.9
K:Mg >25 20-25 10-20 <10
N: S >15 13-15 9-13 <9
K: Na >25 20-25 10-20 <10