Working Procedure - MACHEREY-NAGEL VISOCOLOR Manual

Manual VISOCOLOR

1.4 Working procedure

100 g soil +
100 mL extraction solution A
Stir for 2 min
Leave for 15 min
Filter with MN 616 ¼
Soil extract A
visual determination:
pH 2–9; pH 4.9–10.0
(see 2.6, page 24)
visual determination:
– –
NO (NO ); 2–125 mg N/kg
3 2
(see 2.7, page 25)
visual determination:
+
NH ; 10–300 mg N/kg
4
(see 2.8, page 25)
22
®
reagent case for soil analysis
Representative soil sample ~ 400 g
Screen non-dried soil
200 mL extraction solution A
Shake for 5 min
Leave for 15 min
Filter with MN 616 ¼
Soil extract AF
photometric determination with PF-3
NO
photometric determination with PF-3
NH
Calculation and correction for moisture content, area...
(see 4, page 31)
Sampling
100 g soil +
–
; 20–500 mg N/kg
3
(see 3.3, page 28)
+
; 0.2–4.0 mg N/kg
4
(see 3.5, page 28)
®
Manual VISOCOLOR reagent case for soil analysis 02.19
Precisely weigh 200 g
Dry for 24 hours
at ambient temperature
Weigh back for moisture content
Screen (2 mm mesh)
Soil density
Sedimentation analysis
10 g soil +
200 mL extraction solution B
Shake for 5 min
Filter with MN 616 ¼
Soil extract B
visual determination:
3–
PO ; 10–200 mg P/kg
4
(see 2.10, page 26)
photometric determination
with PF-3
3–
PO ; 20–500 mg P/kg
4
(see 3.7, page 29)
visual determination:
+
K ; 40–300 mg K/kg
(see 2.11, page 26)
photometric determination
with PF-3
+
K ;40–300 mg K/kg
(see 3.8, page 30)