I grow in manure myself. 400 gallon boxes I made ...however when working with any type of compost (manure or otherwise) adding synthetic nutes to it kills all the micros.
When starting with organic soils and composts it's better to amend the soil with organic dry nutes and then it's just a water and go. If anything needs an extra boost you can make teas. Of course there are tons of organic liquid ferts out there and most have added bacteria to keep your soil alive and thriving. If done right you really dont have to add any nutes if the soil is dialed in right. Might I suggest reading from the organic section.
P.s. here is mine from last yr...(just amended manure) my friend is 5 6
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