Best way to remove clover patches from a baseball field

Just about any weed killer will take out clover.

Nitrogen fertilizer should help. It really takes off when Nitrogen is low

If you don’t know the grass type, though I suspect it might be Bermudagrass given it is a sports field, you could use a Trimec herbicide which is effective on clover and numerous other broadleaf weeds and it’s safe for use on Bermudagrass, St Augustine, Centipede, and zoysia and other warm season grasses.

Given its a baseball field how don’t know how much product you require - quart, gallon, 2.5 gallons, etc….. - but numerous companies manufacture Trimec herbicide. Something like this LINK. Retail garden centers will usually sell smaller bottles, up to a quart for residential homeowners. You might find larger bottles of Trimec, 1 gallon or larger, at Feed & Seed stores, landscape supply companies, etc.

speedzone works well and quick.

Also, clover tends to grow where there is a nitrogen deficiency.

Fun fact, clover will actually add nitrogen to the soil. So it can be used in the right situations to help lower maintenance requirements for some grasses.

I like Image.

LINK