Home advantage in cricket is stronger than in most sports, and it is produced deliberately rather than by crowd noise. The pitch is prepared to suit the home attack, and the preparation happens over days.
Moisture is the primary lever
Water content in the surface determines how the ball behaves off the pitch. A damp surface holds together and offers seam movement, because the ball grips briefly on landing and deviates.
Withholding water produces the opposite outcome. The top layer dries, loses cohesion and begins to break up, which creates the rough patches and uneven bounce that spinners exploit.
Because moisture leaves the surface gradually under sun and wind, a groundstaff decision made three days before a match still shapes what happens on the fourth afternoon of it.
Grass cover does two jobs at once
Grass left on the surface binds the soil, which keeps the pitch intact for longer and slows the arrival of turn and variable bounce.
The same grass also holds moisture beneath it and presents a slightly uneven surface for the ball to land on, which assists seam movement early in a match.
Shaving the grass removes both effects together. That is why a bare pitch tends to be slow at first and unpredictable later, while a green one is lively immediately and settles down.
Rolling changes the timing of deterioration
The heavy roller compresses the surface and binds loose material, producing a firmer, faster pitch that stays consistent for longer.
A lighter roller, or less rolling, leaves the surface looser, and loose material lifts out under the impact of the ball and the pressure of bowlers' footmarks.
Captains are given a rolling choice between innings for exactly this reason, and the option is used to accelerate or delay the breakdown of the surface depending on who benefits.
Preparation is matched to the attack
A team built around fast bowlers wants pace and carry, so the surface is rolled hard with grass retained and moisture managed to keep it firm.
A team built around spin wants the top to break early, which means less water, less grass and less rolling in the days before play.
The instruction is rarely explicit, but the groundstaff knows the squad, and the preparation reflects it.
Why the advantage can rebound
An extreme surface shortens the match, and short matches carry more variance because a single session can decide them.
A pitch prepared to turn sharply also removes the home batting side's usual conditions, and touring spinners can exploit it just as effectively.
Boards therefore preparing surfaces on the edge accept a real chance of losing quickly, which is why the most extreme pitches appear when a series is already at stake.