The Grass Doctor

Is it bad for horses to graze grass that has had chemical fertilizer applied?

The fertilizer is standard lawn fertilizer/weed killer containing Ammoniacal Nitrogen, Urea Nitrogen, Phosphate, and Potash. It was applied well over a month ago, there has been abundant rain, and the grass has been mowed several times since application. The concern is whether any potentially-harmful chemical remains in the grass plant that could be bad for our horses if we let them graze on the lawn.

Public Comments

1. Your grass has had plenty of time to recover from the fertilizer. We'll usually let our horses back out in the grass after a good rain (or lots of watering), providing it's been at least 48 hours.
2. yes it is bad, it can go into there system's and shut down there kidney's liver's..etc. its like poison
3. I've got a feeling the time after application of fertiliser is something like 4-6 weeks, so it should be alright by now - especially if it's been raining. I'd be inclined to wait a couple of weeks longer though, if you're not desperate to get the horses back on, just to be sure.
4. After one good rain the fertilizer in deep in the ground and far away from the grass stems.
5. yes it is very bad becausse your horse will start puking up blood and then get very ill and skinny trust me im studying to be a vet
6. Yes its bad! Its like poison! Yikes.
7. read the bag.
8. it has been long enough, so it is fine. but be carefull and monitor your horses carfully
9. Yes, it is bad but considering its been over a month I think you should be safe.