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Nitrogen deficiency: Older fronds light green throughout, new fronds remain dark green until deficiency is really severe
Potassium: Older fronds get translucent yellow/orange or dead spots on fronds, especially at the tips. Sometimes tips are curled or frizzled. Always starts at tips of oldest leaves, moving inwards
Magnesium: Yellow linear bands on leaves but generally transitions to solid green at the base of each leaf. Never causes leaf tip necrosis
Iron: Many times caused by overly mucky soil and root rot. Starts with new spear leaves with yellow-green or even white, possibly with spots of green.
Manganese: Lengthwise necrotic streaks in leaves with dead and curled leaf tips. Similar to bands showing Magnesium deficiency
Boron: Bent or necrotic or distorted leaf tips, distorted or bent spear, bands of dead spots on new fans, spears that won't fully open
Underwatering folding fronds, brown at the edges first, later followed by yellowing of the whole leaf. Overwatering can be drooping fronds turning yellowish and losing color