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What causes this type of yellowing leaves on my mandarin?

I understand that there are many factors that cause citrus leaves to turn yellow but anyone able to tell what the problem is by looking at the pattern of the yellowing? Ive been fertilizing every 3-4 weeks 1/2 tablespoon per gallon of water (3-4 weeks because it takes that long until the mix dries out). So I don't think it's salt buildup. Could it be because I'm allowing this 2 and a half year old tree(potted in December of 2016) to grow fruits and taking away energy?? I've got 2 green fruits on it now.

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