The phrase "a bit of soil" is correct and usable in written English.
It can be used when referring to a small quantity of soil, often in contexts related to gardening, agriculture, or environmental discussions.
Example: "To start the garden, we only need a bit of soil to plant the seeds."
Alternatives: "a small amount of soil" or "a little soil".
After showering one table with a blizzard of white truffles, Mr. Zakarian spotted a bit of soil on a black carpet runner in the kitchen.
On rocky slopes and peaks, plants are found in scattered patches where there is a bit of soil and some snow cover in winter.
When that is completed, the Argosy will stand alone on the block of massive structures, like a wildflower that has found a bit of soil in a crack in the pavement.
A little cold weather will not bother them, and with a bit of soil preparation, you can create a cottage-style garden border or a wildflower meadow that's blooming by midsummer: try Pictorial Meadows (pictorialmeadows.co.uk) or Nicky's Nursery (nickys-nursery.co.uk) for hardy annual seed mixes.
Just add a bit of soil from your local meadow.
Then remove part of the enclosed wax and collect a bit of soil to measure the water content.
The root seeks a bit of penetrable soil, bores in, gets a grip, then pulls the bulbil in after it.
The vineyard site is full of rocks and iron, with a bit of alluvial soil over the top.
Historic space is given a feminist twist in Aleksandra Mir's sly video "First Woman on the Moon," which shows the artist planting a flag on a bit of Dutch soil that has been temporarily refashioned by bulldozers to resemble the moon's surface.
He guessed that they had arrived at their particular spot when the road was being built and a bit of limestone soil containing orchid seeds had found its way into the road margins.
One gives directions for a woman who has lost a child and buried it: the grieving woman takes from the grave a bit of the soil, which she wraps in black wool and sells to a merchant, saying, "I sell it; you buy it / this black wool and this grain of sorrow".
