Classification Table

Concentration in the
1:1.5 vv method

Optimum

Treated

Washed

Regular

E.C. (mS/cm)

< 0.6

0.6 – 1.0

1.1 - 1.5

1.6 – 2.0

NH₄⁺ + NO₃^- (mmol/liter)

< 8.0

< 9.5

< 11.0

< 15.0

K⁺ (mmol/liter)

< 6.0

< 6.0

< 6.0

< 6.0

Na⁺ (mmol/liter)

< 1.7

< 2.5

< 3.5

< 4.5

Ca⁺⁺ (mmol/liter)

< 3.0

< 6.0

< 6.0

< 6.0

Mg⁺⁺ (mmol/liter)

< 3.0

< 3.0

< 3.0

< 3.0

NO₃^- (mmol/liter)

< 6.0

< 7.5

< 9.0

< 11.0

Cl^- (mmol/liter)

< 1.7

< 2.5

< 3.5

< 4.5

SO₄^{- -}(mmol/liter)

< 3.0

< 6.0

< 6.0

< 6.0

P ^{- -} (mmol/liter)

<1.5

< 1.5

< 2.0

< 3.0

1:1.5 vv BaCl₂ Analyze

Optimum

Treated

Washed

Regular

Na (mmol/liter) in BaCl₂

< 1.7

< 2.5

< 3.5

< 4.5

Na (mmol/liter) in BaCl₂ minus Na in H₂O

≥ 1.0

≥ 1.0

≥ 1.0

≥ 1.0

K (mmol/liter) in BaCl₂

< 6.0

< 6.0

< 6.0

< 6.0

K (mmol/liter) in BaCl₂ minus K in H₂O

< 2.0

< 2.0

< 2.0

< 2.0

Or:

Ca (mmol/liter) + Mg (mmol/liter) in H₂O

≥ 1.0

≥ 1.0

≥ 1.0

≥ 1.0

pH Class

pH H₂O

Optimum, Treated

5.0 – 6.0

Washed, Regular

6.0 – 7.0

Trace elements

Concentration in the 1:1.5 vv method

Maximum

Fe (µmol/liter)

< 40

Zn (µmol/liter)

< 10

Cu (µmol/liter)

< 5

Mn (µmol/liter)

< 10

B (µmol/liter)

< 40

Heavy Metals

Element

Maximum

Cr (mg/kg of dry material)

< 50

Ni (mg/kg of dry material)

< 10

Cu (mg/kg of dry material)

< 24

Zn (mg/kg of dry material)

< 73

As (mg/kg of dry material)

< 21

Cd (mg/kg of dry material)

< 0.72

Hg (mg/kg of dry material)

< 0.23

Pb (mg/kg of dry material)

< 65