best fertilizer for orange lime bonsai

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hello. I am working on orange, mulberries and mexican oleander. And waiting to germinate tamarind and banyan. I dont know what type of fertilizers should i buy. I mean which ratio is best for me, N:P:K . ? I cant get bonsai fertilizer, as it is not available in my city. Just a few people know about bonsai. Even i am new to this concept. I am reading about it from last 2 years.now i decide to give it a try. So plz advice me which ratio is best. As orange tree needs nitrogen more, i think. Thanx.