What Fertilizers Should I Not Use on Sago Palms
Sprayed my sago with ironite lawn fertilizer and now my palm is yellowing.
The following article might help: https://www.gardeningknowhow.com/ornamental/trees/sago-palm/how-to-care-for-sago-palms.htm
I would suggest a well-balanced fertilizer made for houseplants, used according to package directions. While Ironite is made specifically to "green up" lawns, it may not be entirely suitable to a cycads preferance.