This was a good read thankHere is what Craig Harper says about it:
This was a good read thank youThis doesn't directly answer your question, but is a good read regarding the subject.
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://fwf.tennessee.edu/wp-content/uploads/sites/24/2020/07/Effects-of-fertilization-and-thinning-FEM-2018.pdf
No fair, you live down in bluegrass country with that highly fertile silt loam phosphatic limestone topsoil that grows big heavy racks (and drops acorns like peanuts on jimmy carters farm)This slightly less than 18 foot DBH white oak and others in my yard produce well without fertilization.
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Jimmy's peanuts and Billy's BeerNo fair, you live down in bluegrass country with that highly fertile silt loam phosphatic limestone topsoil that grows big heavy racks (and drops acorns like peanuts on jimmy carters farm)
Poor soils and only two big oaks on an 80 acre property with fertilizer only being $18 for 50 lbs makes this common sense decision easy for me, in fact, it isn't really a decision, it's just another line item on my list of things to do such as mineral licks, trimming trees, clearing roads and fixing water bars, but I only throw a bag out to the white oaks every five years or so.I would suggest there is a difference between young trees we plant that are trying to establish and put on initial growth. I think fertilizer benefits them, because the root system is limited. Mature oaks have huge root systems. I believe that is the likely reason studies show no benefit from adding fertilizer. The other interesting believe that was debunked a number of years ago is that if you fertilize an oak, the acorns will be more attractive to deer than the unfertilized acorns nearby.
You can find any opinion you want on the internet. There are lots of habitat things we can spend our money on. I think that when we follow the science, we waste fewer dollars allowing more to be applied to the things we know work. There are many things that have not been studied. I think this is the area where the best you can do is use anecdotal evidence and testimonials from others to decide what opinion you want to follow.