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I know how fish emulsion works as a foliar spray on deciduous shrubs, but will it work on needle leaved evergreens such as mugho pines and junipers? If not, what should be used for comparable result?

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Yes it does. Just add a small amount to water and do a light mist over the leaves when it is not sunny. If it is sunny your spray will cause black spots on the leaves. The result would be leaves that are a little bit larger.

Most foliar fertilizers should be rich in micronutrients, Nitrogen(N) and Phosphorus(K). Here is a powerpoint that explains how foliar feeding works

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There is nothing in the powerpoint reference that refers to evergreens. The plants they refer to are annuals and perennials. The question is about evergreens which have a thick waxy cuticle which is a factor that reduces the effectiveness of foliar sprays. Can you provide a reference for foliar sprays on evergreens? –  kevinsky Dec 15 '13 at 15:49
    
Yes it does p 10, and p22. Citrus sinensis is considered an evergreen. –  user3084006 Dec 15 '13 at 18:06
    
The question is about needle leaved evergreens. Citrus sinenesis is an evergreen that is hardy to zone 9 and considered frost tender. I cannot find anything that says that foliar sprays on needle leaved evergreens are very effective due to the waxy cuticle. –  kevinsky Dec 15 '13 at 18:24
    
Agree with kevinsky - my answer to this question would be no, the spray will be ineffective. –  Bamboo Dec 17 '13 at 13:52
    
@Bamboo Where is your evidence the spray is ineffective for conifers I found an article saying it is effective for absorbing nitrogen from the University of Washington –  user3084006 Dec 17 '13 at 23:38
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