Clay content tells you more than the grass ever will

How a surface breaks up on day four is decided by soil chemistry, not by anything you can see on the morning of the match.

Ask what makes a pitch turn and you will get answers about grass, watering and rolling. Those matter at the margin. The thing that decides how a surface behaves in the second half of a long match is the proportion of clay in the soil it was made from, and that decision was taken years before anybody arrived with a camera.

Clay shrinks when it dries. High clay content, above about half by weight in the strips that produce the sharpest deterioration, means the surface binds hard under the roller, then cracks as it loses water through a match. Those cracks are the story of every day four. They give the spinner something to land on, they cause uneven bounce as the edges break away, and they are why a pitch that looked identical on Monday and Thursday is a different game.

Low clay soil with more silt or sand behaves the opposite way. It does not bind as tightly, so it does not crack in the same pattern. It wears rather than fractures, the top loosens, the ball skids and holds up, but you rarely get the shooter that keeps low or the one that leaps. That is the surface people call slow and it is a chemistry outcome, not a preparation failure.

Which is why the trade in imported soil bothers me. Grounds around the world now buy pitch soil from a small number of quarries known to produce good cricket surfaces, and it works, in that pitches are more reliable and fewer matches are ruined. It also nudges every venue towards the same behaviour. Home advantage in cricket has historically been about surfaces being genuinely local, and a shared supply chain flattens exactly that.

The reply is that nobody wants unplayable pitches, and there is a safety argument, and both are fair. There is also a middle position, which is that a country should be free to prepare surfaces that suit its own players from its own ground, and that the sport is poorer when every Test is played on something close to a neutral surface.

If you want to know what a match will look like, do not photograph the grass.

Ask what the soil is made of and where it came from. Somebody at the ground knows, and almost nobody is asked.