How to Read Your Soil: Practical Field Checks That Actually Matter

Soil tests are important, but they don’t always tell the full story.

A farmer who understands how to “read” his soil in the field has a major advantage when making decisions about planting, fertiliser, and management.

Start with something simple: after a rain, walk into your field and observe how the water behaves. Are there puddles sitting on the surface?

Does water run off quickly? Or does it soak in evenly? Poor infiltration is often the first sign of compaction or weak soil structure.

Next, take a handful of soil and squeeze it. Healthy soil should form a loose ball that breaks apart easily.

If it feels hard, sticky, or forms tight clumps, that’s usually a sign of low organic matter or compaction.

Look at your roots. When pulling up a crop, are the roots growing deep and straight, or are they shallow and restricted? Shallow roots often indicate a compacted layer below the surface, which limits access to water and nutrients.

Earthworms are another strong indicator. If you’re not seeing any biological activity in your soil, it’s a sign that the system is not functioning optimally. Living soil supports better nutrient cycling and plant health.

Colour also matters more than most people think. Darker soils generally have higher organic matter and tend to be more productive. Pale or crusted soils often struggle with water retention and fertility.

In areas like Mpumalanga, where heavy summer rains can cause erosion, these small observations become critical. Knowing where your soil is weak allows you to act early.

Whether that means adjusting tillage, adding organic inputs, or improving ground cover.

The more time you spend observing your soil, the better your decisions become. Over time, you’ll start spotting problems before they show up in your yield.