Peas, carrots, and radishes can go in the ground at the same time. Radishes come in two basic forms; round and long. Long radishes and carrots need the same basic type of soil... loose loose loose. If you don't have loose soil the roots don't grow well. Peas are just not particular about the soil as long as it isn't wet and muddy. These are three cool season crops that can be put in the ground early.
Planting Peas, Carrots, and Long Radishes
in a Raised Bed Garden
Step One: Add in some peat moss and moisten it
Step Two: Add in one bag of the composted humus and manure
Step Three: Plant you seeds. In this case it is peas
Step Four: Plant your seeds. In this case carrots
Preparing the planting area for carrots (and long rooted crops)
Add an inch or so of composted organic matter or in this case the mixture of peat and composted humus and manure down the length of the row. When in doubt use more then you think. Mix this in with your hand shovel to about 8 - 12 inches.
Planting the carrot seeds (the same for long radishes)
The tips of my fingers are one spot each. There are 2 or 3 seeds in a spot. Each spot will have to be thinned to one plant if more then one emerges. Do not stress about the spacing... 2 inches in either direction is fine. Just dont forget to thin. You might even go 4 carrot spots across if you furrow is wider.