Other than broad beans I've given up sowing seed direct. The soil is OK for fertility but it's not yet fine enough for small seeds and can be very dry so I sow seeds, prick out and plant bairns at the appropriate distance.
This also protects plants from OH who is an intermittent but blitz weeder, even stuff growing in straight rows. He does now recognise garlic, onion and leek babies and we have netting over the brassicas which gives him a clue and twisty metal posts next to the tomatoes, chillies and cucumbers.........