Soil Analysis

Plant Tissue Analysis

Water Analysis


Fertilizer, Compost & Manure

Soil Analysis Methods Used at Best-Test Analytical Services

Parameter

Units Reported

Methods

pH

Unit

(1:1) Soil:Water Ratio

Buffer pH

Unit

SMP or Adams-Evans

Electrical Conductivity

mmhos/cm

(1:1) Soil:Water Ratio

Organic Matter

%

Walkley Black

Lime

%

Acid (HCl) Titration

Effervescence

Scale 1-7

3N HCl

Nitrate Nitrogen NO3-N

ppm = mg/kg

Chromatropic Acid

Ammonium Nitrogen NH4-N

ppm = mg/kg

1N KCl Extraction

Phosphate-Phosphorus (PO4-P)

ppm = mg/kg

Olsen (0.5N NaHCO3)

Phosphate-Phosphorus for Acid Soils (<5.5 pH)

ppm = mg/kg

Bray (NH4F,HCl)

Potassium

ppm = mg/kg

Olsen (0.5N NaHCO3)

Calcium

ppm = mg/kg

1N KCl Extraction

Magnesium

ppm = mg/kg

1N KCl Extraction

Sodium

ppm = mg/kg

1N KCl Extraction

Zinc

ppm = mg/kg

DTPA Extractable

Manganese

ppm = mg/kg

DTPA Extractable

Copper

ppm = mg/kg

DTPA Extractable

Iron

ppm = mg/kg

DTPA Extractable

Sulfate-Sulfur

ppm = mg/kg

Ca(H2PO4)2 * H20

Boron

ppm = mg/kg

Ca(H2PO4)2 * H20

Texture

%

Hydrometer Method

Cation Exchange Capacity

meq/100g = cmol/kg

Sodium Acetate / Ammonium Acetate Method

Total Phosphorus

%

Nitric-Perchloric Acid Digestion

ESP = % Na of CEC

Percentage of Sodium of CEC

Chloride

%

Water extraction

Total Kjeldahl Nitrogen (TKN)

ppm = mg/kg

Kjeldahl Method

Gypsum Requirement

lbs/ac

Calculation from ESP

Moisture

inches/depth

Gravametric

Saturated Paste Extract

Vacuum Filtration (Water)



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