No.Do you reckon turkeys "gravel" on fertilizer and it kills them? Seems like there are some well read folks on here so thought I'd ask.
Fertilizer grains are too small to be terribly interesting to a turkey. The P and K are minerals that must break down / dissolve and it would take a lot to even have the potential of causing a problem. N absorbs moisture and dissolves pretty quick but if a bird picked up a few pieces it would likely not continue as it would be irritating to the mouth and esophagus. I made compost ( thousands of tons ) for years and have looked for sources for manure everywhere. Turkeys like horses have a poor conversion rate and their poop is not fuel for composting ( almost no nitrogen) This means that whatever they consume gets deposited pretty quickly and is low in key microbials and nitrogen. So if they did ingest a couple mouthfuls of fertilizer they would likely develop the squirts and it would be gone same day.