Unearthed "covered" refers to the phenomenon that cotyledons are unearthed with seed coats. When unearthed, there are two kinds of seeds holding cotyledons, which are difficult to open. It has a great influence on the growth of seedlings. The reason is that the soil on the seed is too thin, and the gravity of fine soil is not enough to remove the seed shell. In addition, when the seeds are planted vertically in the soil, it is also easy to happen. Seeds of Cucurbitaceae, Zinnia, Dahlia, Abelmoschus manihot, ornamental pepper, milk eggplant, etc. are easy to be unearthed with caps. See a "hat" unearthed, immediately covered with fine soil; If it is too high to cover the soil, spray it with a sprayer in the morning to make the seed coat moist, and then gently take it off by hand.