Don't station sow your next batch. Do as DD says and broadcast sow or sow in lines thinly. I grow in raised beds and I guess that the principles will be similar.
Everything is sown much closer together than the packets suggest. It is also sown equidistant to each other. I do thin my veg, but it really depends on how large I want it to get before harvest and the type it is. As sunshineband says, radish and beetroot push others away and don't mind a bit of crowding.