Originally Posted by shilala

Sawdust jacks the ph all out of whack, Lance. Turns the soil acid. That's why we put it on blueberries, they love acid. Test it and adjust it and you'll be golden. I never heard about sawdust tying up nitrogen. I can't think of a mechanical reason for that to happen.
A bunch of dolomite lime and you'll be good to go.
You're lucky, it's a cheap fix. You can't use too much, either.
If you think your nitrogen is tied up, top dress the lime with compost or composted cow manue. It's cheap, too.
The rain will leech all the nutrients to the plants and you'll be double golden.
I wish I'd have caught you before you used sawdust. It's the worst organic material you can use in a garden. You're seeing that now. Sorry, brother.