Smoke from the fire drifted across both sides of the Solent, prompting fire crews to urge people to keep doors and windows shut.
The fire service said a large hose had been laid from Hightown Lake, just east of Ringwood, to supply water to crews tackling the blaze.
In some areas, the hose crosses tracks and passes through private property.
Residents have been urged not to drive over it, as doing so could damage the pipe and disrupt the water supply needed to fight the fire.
On Sunday, 26 fire crews alongside water carriers and specialist off-road units were sent to the scene as the flames quickly spread.
The fire service said the blaze travelled south-easterly from the A31 towards Backley Bottom.