If its just seedlings, water 1 time per day with 1/3 liter. after a week just water 1 time real good and then let the soil dry out, might take 4 or 5 days to get dry, then water vigorously and let dry . lather. rinse. repeat. You do not want the soil to be moist all the time. It is VERY important that the soil get dried out. the roots must have oxygen to survive and mud does not hold oxygen.