Is houseplant fertiliser dangerous for a cat?

Firstly, a disclaimer: cat has not ingested anything. This is just about the precautions I need to take.

I (M42) am a plant enthusiast. I was putting some fertiliser (solid/powder) into a watering can when I accidentally dropped the fertiliser container and spilled a bunch on the carpet. I cleaned it off immediately (brush followed by vacuum), but obviouly it being carpet + vacuum, some particles are bound to be left over. How bad is this with a cat (F7, spayed) in the house?

Fertiliser contains nitrogen, phosphorus, potassium, magnesium, sulphur, boron, copper, iron, manganese, molybdenium, and zinc, in descending order. There are no warning labels. I spilled maybe two to three tablespoons' worth. Cat, being her curious self, took a whiff and left.

If it's relevant, I'm in Europe and vet is accessible if needed. Also, before anyone asks, all my plants are cat-safe.