http://www.hardwarestore.com/media/msds/134130.pdf

I dont know, its not ideal, but it not gonna kill it either so....... I know one thing though, when looking for a good N source its good for it to be chelated rather than non-chelated. The plant does not have to break it down as much when the N is chelated. (this goes for all nutes by the way) Note to self, when it says N source is from urea, thats urine dude.......