I don't think chemical fertilizers are as problematic as insecticides or herbicides. Though I would avoid anything that was pelletized since chickens love to eat things that look like gravel.
If you've just recently fertilized, I would water the area with just water for a while first, then you should be fine.
If its rained since you fertilized I think that is okay.
The only thing that might be an issue is getting in contact with fresh fertilizer, but even that is probably not particularly dangerous.
If you've just recently fertilized, I would water the area with just water for a while first, then you should be fine.
If its rained since you fertilized I think that is okay.
The only thing that might be an issue is getting in contact with fresh fertilizer, but even that is probably not particularly dangerous.