Fertiliser Analysis

The Fertiliser Advisory Service also offers routine and supplementary analyses on liquid and granular fertilisers, urea, CMS, composts and manures.

Analysis of these nutrient sources is a critical element of proper soil nutrient management planning. Reliable data on the nutrient composition of products is essential for optimising yields and preventing environmental pollution by nutrient ‘overloads’.

What We Offer

Cost Per Sample

Total nitrogen, phosphorus, potassium.

SA

R279.00 (VAT incl)

SADC Countries

R334.00

Other Countries

R334.00

Cost Per Sample

Moisture, total nitrogen, phosphorus, potassium, calcium, magnesium and carbon/nitrogen ratio.

SA

R362.00 (VAT incl)

SADC Countries

R426.00

Other Countries

R426.00

Cost per element per sample

pH, sulphur, zinc, iron, manganese, copper, carbon.

SA

R132.00 (VAT incl)

SADC Countries

R138.00

Other Countries

R138.00

Where the material has been piled or stored in large heaps or windrows the following sampling procedure is advised:

  • As there can be high variation in the piled or heaped material is preferred that the piles/heaps be thoroughly mixed prior to sampling.
  • Several samples from different sampling locations and depths in the heaps must be collected.
  • Collect the sample as close to the time of field application for most accurate results of composition.
  • Samples can be collected using a spade or auger. Avoid galvanised sampling instruments as these can introduce zinc in the sample.
  • Avoid collecting samples too close to the soil surface where the heap is located as soil can be introduced into the sample. Even a small amount of soil can result in anomalous results.
  • Subsamples (20 – 30) can be placed and thoroughly mixed in a bucket before subsampling (about 500 grams) for analysis.
  • Break-up large chunks/aggregates into finer pieces before mixing.
  • Place subsample for analysis in a heavy-duty/thick-walled plastic-bag, squeezing all air from the bag before sealing tightly.
  • Label the sample with relevant information required by the laboratory to ensure proper identification of the sample.
  • If the sample cannot be sent for analysis immediately then store in a cool dark place (ideally in the fridge or cooler box with ice).

Where the material is spread-out across a large area (e.g. kraal floor, chicken house floor) it is preferable to collect the material into a large well mixed pile or heap before following the above sampling procedure. Where this is not possible, then 20 – 30 subsamples collected in a zigzag pattern from the area and composite into a single sample for subsampling. Special care must be taken not to scrape soil or floor material when collecting the subsamples.

If sampling from bags, then sub sample each bag and thoroughly mix to create a single composite sample. Subsample about 500 grams for submission.

  • Use clean, uncontaminated, sealable and non-breakable (plastic ideal) bottles that can hold at least 250ml of slurry.
  • Rinse the container with some of the slurry from the source that will be analysed.
  • Where slurry samples are to be collected from dams/ponds/canals then it is important to adhere to the following guidelines:
    • Avoid sampling close to the edge of the storage dam/pond.
    • Collect slurry from the outlet of the storage area.
    • If collecting from an open pond, sample from at least 0.2 m (20cm) below the slurry surface.
    • It is usually best to collect several samples and mix these to produce a single composite sample.
  • If the slurry is pumped then samples can be taken from the pump outlet. Run the pump for a short time to ensure old material is flushed out before sampling.
  • Fill the container to the top (to minimise headspace) and seal the container immediately.
  • Attach all relevant information required from the testing laboratory and label samples clearly with markings that will not readily degrade or be rubbed off.
  • If the sample cannot be sent for analysis immediately then store in a cool dark place (ideally in the fridge or cooler box with ice).

Irrigation Water
Analysis

Irrigation Water Analysis

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