The surface a cricket match is played on is prepared over days, not laid down and left. The choices made during that preparation shape scoring, wear and the balance between bat and ball.
Soil composition sets the baseline
Pitch soil is selected for its clay content, because clay binds tightly when compacted and holds together as the surface dries.
High-clay soils produce hard surfaces that stay intact for several days. Lower clay content means the surface breaks up sooner and spin becomes influential earlier.
This composition is a property of the ground itself, built up over seasons of topdressing, and it cannot be changed in the week before a match.
Rolling compacts what moisture has softened
Water is applied to soften the surface, and heavy rollers then compress it. The combination drives out air and produces the hardness that makes a pitch fast.
Rolling a dry pitch achieves very little. The moisture has to be present at the right level for compaction to work at all.
Getting this wrong in either direction is difficult to correct, since a pitch cannot be un-rolled and there is rarely time to start again.
Grass cover controls early movement
Grass left on the surface holds moisture and gives the seam something to grip, which is what produces sideways movement in the opening session.
Shaving the grass closer removes that assistance and exposes the soil, which then dries and cracks more readily as the match progresses.
The decision is often made on the morning of the match, which is why the final appearance of a pitch can differ from how it looked days earlier.
Weather interacts with everything prepared
Cloud cover, humidity and wind all affect how quickly the surface dries and how the ball behaves in the air above it.
A pitch prepared for hot conditions behaves quite differently under overcast skies, because the moisture the curator planned to lose simply stays put.
Covers add another variable, since a pitch sweating under covers can retain moisture that changes its character for a full session.
Curators work to a brief
Grounds staff are usually given guidance about the kind of contest wanted, whether that means a surface lasting the full duration or one producing a result.
That brief is constrained by climate, soil and the time available between fixtures, so the result is a negotiation rather than a specification.
It explains why the same ground can produce contrasting matches within a single season without anything unusual having happened.