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I have mature az sweet, tangelo, grapefruit, tangerine and lemon trees.  I would like to formulate my own fertilizer.  I have access to high nitrogen bat guano.  Any Ideas of what to add to this to formulate a balanced general citrus fertilizer?  I am in tucson, AZ. with sandy soil.  

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To be quite honest, most soil in Arizona has great mineral content.  It is missing organic material and nitrogen.  I only add nitrogen (alfalfa pellets) and wood chips (organic) mulch to keep citrus happy.  On a rapidly draining sandy soil (if that is what you have) then possibly a lot of minerals have leeched out.  Have you tested your soil for trace minerals?

I guess my point is bat guano (nitrogen) may be all that you need.  Definitely want to get a nitrogen source down now.

Thank you Powell,  This forum is a jewel to me...learning how to grow trees in our climate.  I have learned the most from hours reading this forum...many of the posts yours,  thank you for responding.

Citrus Fertilization Chart for Arizona
https://extension.arizona.edu/sites/extension.arizona.edu/files/pub...

If not using packaged bat guano then bat guano is 7-10% nitrogen.  An arid natural source (local) is likely is on the low end. 

Fertilize your Citrus like an acid liking rhododendron and you'll be ok.

http://www.rhododendron.org/v47n4p202.htm
Or you can be lazy and just top dress with chicken manure every month.

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