Question
Raised beds contain 1/2 top soil and 1/2 Mushroom Compost. Got results from Tennessee Ag.  1. Said tests do not work with organic material, i.e. Mushroom Compost.  PH 7.4 Phosphorus Very High 120+, Potasium High 245. Test report suggested 15-15-15, then the Manager said do not use 15-15-15?, which makes sense with high phosphorus and potasium. They also Suggested Amonium Nitrate? can't find i.e. Oklahoma situation.  I plant most vegetables including Potatoes.  What do you suggest, Thank You

Answer
Well this is most definitely confusing, my friend.  I'd be dizzy reading that report.

My concern is -- did they really state the tests 'do not work with organic material'????  Huh?

Perhaps this qualifier was intended to point out that by waiting for Organic Materials to decompose, rather than doing a test on just-amended Soil, you get a more legitimate reading of plant-available nutrients.  That would be a good point to make.

Your pH does sound high at first glance.  But consider that Most crops are healthiest in Soil with a pH from 6.5 to 7.5.  They get everything they need out of the Soil in that range.  Don't sweat the pH.  No Ammonium Nitrate -- NH4NO3 -- 33.5-0-0.  That's 33 1/2 percent
Nitrogen.  Half of it in Nitrate form.  That N leaches right through the Soil INSTANTLY away from your crops and next thing you know BAM! it's in your local water supply.  Runoff of excess Ammonium Nitrate is a major pollutant source.

No word about salinity or CEC?

What are these folks in the Agricultural Extension doing there in Tennessee?  First they tell you yes, 15-15-15.  Then they tell you no, 15-15-15.  I agree, NO.

What you do next depends really on what you grow.  The Nitrogen your crops need depends on yield and what's available in the Soil today.  Corn shows optimal growth in Soil with an N-P-K ratio of 1.25-0.5- 1.5.  Excessive levels of P can interfere with the Copper and Zinc; too much K slows uptake of Mg, Mn, Zn and Fe.  But boosting the N in your Soil can diminish the imbalance of nutrients.  Red Clover is commonly interseeded in Corn, Squash, Pumpkins, etc., to boost N levels.  Potatoes and Tomatoes actually PREFER Nitrate as their source of Nitrogen.

Please tell me what you're growing, and I'll be more helpful.  Thanks for writing; now, rsvp.