Cover the planted SEEDS with a board until they germinate to maintain a moist soil. Uncovered soil dries quickly (which is why we use mulch to cover them as well). Seeds will not sprout when stressed by dry soil. You barely cover the carrot seeds with soil since they are so small. Good luck!
A board such as a 1 X 3" is simply to keep rain from dislodging the tiny seed from the soil and retain moisture. I check my seed germination after a week then daily until the seedlings are about 1". Then I remove the board, thin the seedlings and cover with a floating row cover. I plant them right next onions and have no problem with flies.
You only cover with a board temporarily as to keep the seeds from washing away and from birds eating them. After a week or more, You are to begin checking for sprouts. Within a week to 10 days, if it’s getting hotter in your climate, you elevate the board above the sprouts by placing a rock at each end of the board length and place the board on top of the two rocks. This keeps it a bit shaded since carrots are cool weather. Then as they get larger ferns and safer to expose, you remove the board. I hope that’s helpful.
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