I am not familiar with that plant's suitability to being put into bonzai culture. If you have provided appropriate nutrition as you indictated the problem must lie in the roots being injured. Soggy wet conditions (ususally due to poor drainage) cause iron deficiency and other such problems. Watch the soil moisture carefully and hopefully it will run around in time. Try switching to a fertilizer without the middle number, phosphorus, as high levels of phosphorus lock up iron making it unavailable.
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