Yeah, you can definitely burn plants with organics. Some organics are hard to burn with, but for the most part the more nutrient it has for growing the more you have to be careful feeding it to your plants.

AN nutrients are super-potent so it's easy to end up over feeding your plants if youre not careful. Especially in soil you want to start out a little lighter than you'd think necessary since the dirt probably has some nutes in it already.

How old are your plants, anyway?

Oh, and you can always call AN, they got a tech support line and know tons about growing in hydroponics or soil, and especially how to get the nutrient feeding right for your plants.