If it is the lowest and oldest fronds turning yellow, it is likely nature taking course.
There are several nutrients that if the palm is deficient in, would cause yellowing. The yellowing caused by the nutrient deficiency is distinct to that nutrient as well.
Also, often the nutrient is there for the tree, but it cannot utilize them (the nutrients) due to the pH of the soil being too far from out. Most often in TV, the soil would be too far on the alkaline side.
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