Grid mapping

Precision Farming

Grid mapping is where precision farming started in the UK. It is a basic yet very important part of precision farming.

Standard service includes:

  • P, K, Mg and pH maps
  • Four years of recommendations
  • Data interpretation
  • Application files
  • Soil variation scans NOT included

The process:

  • Map the boundary.
  • Set sampling points (generally 1ha but can be tailored). These are normally set in the office to ensure points are not too close to areas such as boundaries, pits and trees.
  • The operator is guided to each sample point to collect 16 sub-samples to make the 1ha soil sample. The operator logs the point, which might be different to the pre-determined point due to factors that could lead to inaccurate readings such as cattle feeders, muck heaps or wet holes.
  • Samples are logged and then sent to the laboratory.

Information the decision support team need:

  • Type of analysis – standard is S1 (P, K, Mg and pH). Further nutrients can be added for an additional fee. Two popular additions are Ca and OM.
  • Cropping – to create a fertiliser recommendation the decision support team require crop information, yield, target pH, muck information and straw policy.
  • Once these reports have been created it is then time for a discussion with the grower and agronomist.

Key Points to view in the results table:

The cropping form should be updated yearly for new recommendations. Four years of recommendations are supplied with this service.

For a greater depth of knowledge, it is suggested that a broad spectrum Solvita analysis is carried out for the whole field.


Application maps can be made for all major manufacturers’ equipment. Your decision support specialist can advise on file type and format.

scan image of a field showing different rates required for each area of the field colour coded with green and yellows