I've started a garden for the first time in my life and this is one of the problems I've faced. My blueberry bush leaves on some of my plants have turned yellow. I did just prune them at the start of this year. I'm no expert, but I think I did all right. I've also added horse manure and, when they turned yellow, chicken manure with wood chips. Does anyone have any advice on how to fix and/or save them?