The N,P, and K are stable minerals. I am assuming that you are using this as a plant fertilizer?

The brand manufacturer's website, if not the label, should provide that info. It likely varies from product to product.

If nothing else, give them a call for a definitive answer.

Dave

Dave is right....check with the manufacturer. By the way, it's important to mix only what you need for any garden product. Some things (insecticides, fungicides, and herbicides for example) begin to lose efficacy soon after mixing.

A few years ago I bought a packet of Sea Magic (?), and mixed it up into the concentrate as stated on the packet. I used it all that summer but had some left over, so I put it on a shelf in my basement that stays a constant 60* and no sunlight. I used it the following summer, but toward the end of the summer it really smelled funky, so I no longer used it as a foilar spray and only as a soil drench with no ill effects. I now use the Neptune's Harvest and put the gallon jug on the same shelf in the basement, I'm a believer in the constant cool temperature and no sunlight.