While carrots are germinating the soil should never be allowed to dry out. This was the first year I planted parsnips and I treated them the same way as the carrots.

Beans require consistent warm soil temps to germinate.

In my area (Central Maine) I planted carrots in late April and beans at the very end of May.

Jon

If you add a little vermiculite to the holes/rows you put the carrot and radish seeds in, this will help keep them moist. If you cast your seeds on the ground, you could always try working the vermiculite into the soil first. You can also pre-germinate them in a moist paper towel in a ziploc and stored in a warm spot...

With my green beans, I had better success with pre-germinating over direct sowing.

Spray them with a spray bottle to keep them moist. That way they don't get washed away, but the soil still remains moist.

I second pre-sprouting beans. Just be careful when planting that you don't break the sprout. And by pre-sprouting you won't have blank spaces from seeds that didn't germinate. Try putting a piece of shade cloth or something over your carrots to keep the sun from drying out that top bit of soil til they sprout. I also heard that some people put burlap on top of their carrots til they sprout.

Oh yea. Like gardener1908 said, topping the carrot seeds with burlap. A plank of wood helps too... The wood prevents birds/bugs taking the seeds, and from being washed away if it rains.