Burr oak crack in trunk

Good advice I’ve seen is to analyze the soil content first and see what it is lacking before adding to the soil. My armchair analysis is that there is a lot of fert there already from all the years of agriculture, more than the tree wants or needs, perhaps.. not everything is a tomato. If it were in a forest, it would be completely sufficient nutritionally from the leaf litter / duff and its associated web of tiny buddies.
This is why I emphasize strongly that it isn't nutrients that you are after in compost, but microbes. If there is concern that there is too much nitrogen in the compost, then it isn't finished compost- it needs more carbon. If one is super concerned about adding nutrients, then make an extract/leachate of the compost and pour it around the dripline. The biology is where the magic is, not the nutrients.
 
I'd consider imidacloprid as well. Two-lined chestnut borer is pretty common with declining oak and can be one of the significant contributing factors a decline complex.
I’m thinking the same thing just to cover more bases. I was going to ask you if you think it’s too late in the season?
 
So as for treatments to help the tree along, what would you add to the list below?

- add mulch/compost out to the dripline (air knife or no air knife?)

- consider planting a cover crop

- Ask the farmer who leases the field to keep the crops planted further out from the dripline

- Basal bark spray of reliant
Add a fence to that list, sounds like he really loves that tree. With the ag lease on the land one would need to make a physical line, a split rail fence or such would help keep whoever is leasing the land away and remind them not to cross the line
@Stumpsprouts you beat me to it!
 
That looks interesting. I would very curious to look at it under the microscope. Do you have access to a scope, and maybe a soil microbiologist to help anylyze it? Diversity of species is what I would be most interested in.
I will ask if they can provide an analysis of their compost. There’s another company locally that sells the below. Still need more information about it.

There’s also the place where I dump makes their own mulch/compost I could ask the owner if he can give me more details.

 
I will ask if they can provide an analysis of their compost. There’s another company locally that sells the below. Still need more information about it.

There’s also the place where I dump makes their own mulch/compost I could ask the owner if he can give me more details.

The kind of analysis that is available through labs I find in a search all give data in terms of biomass, or other similar metric. What I want to know about a sample is the diversity of species, which you will only learn through field analysis, or if there is a lab nearby, bringing a sample directly to the lab to be scoped within minutes of sampling. If its less than an hour to a university, you may get lucky with finding someone to look at your compost.

I would say that in general, if you do PHC, getting a microscope for a few hundred bucks, and learning how to understand what you're looking at is possibly worth it.
 
I’m thinking the same thing just to cover more bases. I was going to ask you if you think it’s too late in the season?
I don't think it's too late. Adults are emerging now through July. They'll mate and lay eggs that will hatch later this summer. Imidacloprid will take +/- a month to get into the tree which means it's there for the larvae to hatch a s start feeding. My only concern with timing is when it will be too dry so the chemical won't move through the tree as well.
 
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I’m thinking the same thing just to cover more bases. I was going to ask you if you think it’s too late in the season?

[not an arborist (though a bit of a wanna-be) or tree worker; just an early retiree that is getting "into" arboriculture and geeking out on this thread]

But despite that I'll +1 ATH's reply. My bur and white oaks got their imidacloprid treatments for TLCB just yesterday morning. Davey does my PHC and their comment on the work order is "This application can be done Spring - Early Fall as requested." (this is in NE IL). They do try to schedule it for when rain is expected. So my $0.01 (not $0.02!) is it's not too late; as long as you think it's appropriate treatment do it as soon as you have a couple days of rain coming up.
 
We had good rainfall when I did the application, but it’s been enough days now that we need some more rain. Otherwise, I’ll be walking out to the middle of that field with 5 gallons at a time to dump around the trunk. Soy beans are planted so there’s no driving back there with any piece of equipment.

I made a three page report for the old farmer about bringing in compost and giving the tree more distance away from the trunk to where the crops are planted and considering a cover crop. He’s asking me about spreading horse manure? He says horse manure is not as high in nitrogen as cow manure. I haven’t had a chance to really look into it, but he has a way of spreading a soil amendment and planting a cover crop.
 
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Also, when I did the soil injection it was not nearly as compacted under the tree as I thought it would be. He also said the type of tilling they do to plant the crops only goes down a couple inches so that was good to hear that the lateral roots are not getting severed by a tilling machine that goes down a couple feet.
 
We had good rainfall when I did the application, but it’s been enough days now that we need some more rain. Otherwise, I’ll be walking out to the middle of that field with 5 gallons at a time to dump around the trunk. Soy beans are planted so there’s no driving back there with any piece of equipment.

I made a three page report for the old farmer about bringing in compost and giving the tree more distance away from the trunk to where the crops are planted and considering a cover crop. He’s asking me about spreading horse manure? He says horse manure is not as high in nitrogen as cow manure. I haven’t had a chance to really look into it, but he has a way of spreading a soil amendment and planting a cover crop.
I would definitely not spread manure yet. In the future maybe, but not now. You don't need yards of compost- you could innoculate the soil with a single bucket, but that it be some really good quality compost is more useful. I would even go with half worm castings. What you do, especially if you do have to go spread buckets of water, is put a pint or so- though more never hurts- of compost and castings each in a bucket of water and stir it for a minute and splash it out. It's the same area that you wanna be applying the biology anyway. You might ask the higher end nurseries in your area what compost and/or castings they use. Someone knows where the good stuff is at. Better compost yields more dramatic results. The mulch would go a real long way to aiding the biology in doing its job too, but I would wager that will have to wait for the soy to finish, unless you can haul it out in wheelbarrows... doesn't sound cost effective for the client.
 
That little bit of decay in oak isn't worth worrying about.. I didn't even bothger reading any replies... NEXT!!!

You time is better off evaluating the canopy for over-exented limbs, and other structural defects... that tree isn;t going anywhere
 

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