The leaves on my magnolia are starting to go yellow yet the surrounding trees look fine. What could cause this?

One of two possibilities exists. First, magnolia are extremely sensitive to iron and manganese deficiencies in the soil. A soil analysis will confirm if the soil is deficient and the rate and concentration of iron/manganese fertiliser to apply can be calculated. This in turn will alleviate your problem. Second, magnolia trees prefer to grow on acid soils with a low pH. If the pH of your soil has increased then this will also result in the yellowing symptoms you have described. As before, a soil analysis will confirm if this is the problem and remedial measures can be applied.

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