Answer: I'd go ahead and feed as usual. The root system is still the same size as it was before and will need the usual amount of food and water. Citrus trees grow be leaps and bounds and yours should recover from the damage. To avoid this type of damage in the future, you may have to thin the fruit or use 2x4" lengths of lumber sort of like a crutch to shore up the branches that are heavy with fruit. Best wishes with your lemon tree!
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