NviroTek Laboratories
A multitude of laboratory tests are performed to assist with valuable decision making regarding the following:
Soil Sample
Analysis Packages |
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General |
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Standard Soil : pH (water or KCl), P (Bray I or II), Ca, Mg, K, Na, S (AmAc), Exchangeable Acidity, Density, Calculated Cation %, -ratios, S -and T-values. pH and P to be specified: 01ST01 pH (KCl) and P (Bray I) | 01ST04 pH (KCl) and P (Bray II) 01ST03 pH (water) and P (Bray I) | 01ST02 pH (water) and P (Bray II) |
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Mehlich III Basic : pH (KCl) or pH (water), Ca, Mg, K, P, S, Na, Fe, Mn, Cu, Zn, B |
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Mehlich III Standard: pH (KCl) or pH (water), P (Bray I/II), Ca, Mg, K, P, S, Na, Fe, Mn, Cu, Zn, B |
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Mehlich III Complete : pH (water), P (Bray I/II), Ca, Mg, K, P, S, Na, Fe, Mn, Cu, Zn, B, Carbon (LOI), Calculated TEC, H & Other Bases |
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Cape Standard: pH (water/KCl), P (Bray II), Ca, Mg, K, Na, S (AmAc), Eksteen Exchangeable Acidity, Density, Calculated Cation %, -ratios, S -and T-values, Resistance |
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Single Parameters |
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Additional P (Olsen/Truog/Bray I/II) |
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Additional pH (water/KCI) |
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Available Boron (Hot Water Extract) |
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Cl (Chloride) |
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Eksteen Exchangeable Acidity |
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Estimated Clay (Hand method) |
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Stone Fraction |
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C (Carbon - Walkley Black method) |
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C (Carbon - Loss on Ignition / Ashing method) |
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C (Total Carbon - Combustion / Dumas method) |
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Lime Requirement |
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CEC (Cation Exchange Capacity) |
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Micro's (HCl) (Cu, Fe, Mn, Zn) |
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Micro's (DTPA) (Cu, Fe, Mn, Zn) |
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Micro's (Mehlich III) (Cu, Fe, Mn, Zn, S, B) |
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Mo (Molybdenum) |
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S (CaPO4) |
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Ni (Nickel - DTPA) |
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Texture (Clay, Silt, Sand) |
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Sand Fractions (includes Texture analysis) |
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Extractable Nitrogen (NH4 + NO3) |
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N-Check (includes Extractable Nitrogen, Moisture and Density) |
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Total Nitrogen (Combustion / Dumas method) |
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Exchangeable Aluminium |
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Resistance (Saturated Paste) |
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Chemical Dispersion - pH, Conductivity, ESP, EMgP, SAR |
- Soil Sample Guidelines
General guidelines for soil sampling for laboratory analyses
- The sample must represent the fields to be fertilized
- Separate samples from each management or soil area:
- If the soil type and management is similar, a composite sample of a field of approximately 20 hectares can be taken.
- If soil areas differ significantly (color, slope, texture and drainage) the field should be sampled separately.
Follow a random pattern when sampling the area to ensure it is truly a representative sample (see example below):
- A soil probe is the best tool for obtaining a soil sample. Alternatively, a small shovel or spade is satisfactorily.
- Cores should be taken from surface to a depth of 24 to 30cm.
- Collect approximately 10 to 15 individual cores of uniform size and depth, should be composite in a clean plastic bucket.
- Mix all the cores thoroughly and take a sub-sample for the laboratory of 500g or 400ml.
- All samples must be mark clearly and complete the submission document.
NviroTek Laboratories supply small plastic sample bags on request.
Contact Leoni Erasmus on 082 889 0139 / [email protected] for more information.
Biological Sample
Our Biological analysis Packages includes the following tests
Analysis Packages |
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Nematodes - In Association with Nemlab |
| Routine Nematode Analysis - Vines, Stone Fruit, Nuts, Pastures, Turf Grass, Ornamentals, etc. |
| Root Nematodes - Citrus |
| Soil and Root Nematodes - Apples, Pears, Persimmons, Tomatoes, Tuberous Vegetables |
| Cyst Nematodes - Brassicas, Potatoes, Figs, Hops |
| Plant Associated Fungi |
| Phytophthora, Fusarium, Pythium, Sclerotinia / Other Bacteria / Fungi |
| Soil Health Biology Tests |
| Solvita (CO₂ Burst) |
| Active Carbon |
| Aggregate Stability |
| Potential Mineralisable N |
