Not that I want to open this back up, but there are agronomists pushing high single application rates of potash to test the efficacy of getting to optimum base saturation immediately to facilitate better total plant nutrient uptake driven by base saturation balance. I went 800 lbs potash to try to get into that 6% range to optimize mine. When I said I earned my manganese boost, I didn't apply any. The increase in K made the manganese already in the soil "plant available."
The Ag Phd guys went as high as a single application of 1400 lbs/acre. Here's a link to the article:
http://www.agphd.com/ag-phd-newslet...ese-the-silver-bullet-for-high-yielding-corn/
As long as you're not growing in beach or blow sand, that potassium isn't going anywhere. It's as good as money in the bank. Brian and Darren actually make a half hearted joke that they feel they should be allowed to claimed banked soil K as an asset on their balance sheet. I used to be a vocal critic of heavy potash fertilization and would chew my brother's butt over it. And we argued. It wasn't until many soil work shops later that I grasped the concept of base saturation and how that order affects what's attached to soil particles. The reason I aimed for 6% was to get in that ideal range and to be able to stay in that 4-8% range for years before I'd have to worry about adding more.
A grazing deer is going to surely carry some nutrients off your plots. At the same time, that deer is also going to carry some on. Deer spend 90% of their day bedded. The 10% they are on their feet is likely going to be spent standing in your plots a good portion of that time hoovering it in on the front end, but also shooting it out the back end. So the rate of removal is at best unknown. I've got the deer poo smeared on my boots every spring walking through my plots, and I know you do to. This is a big reason I test my stuff almost every single year. I am as curious as anyone if my nutrients are leaching or being carried away. So far, I have not found that to be true, or even observed a measurable drop in K.
This is far from widely accepted science at this point. Not all ag professionals subscribe to Mulders model of nutrient synergy and antagonism. Some ag pros still believe that balance is irrelevant as long as crop removal ppm is available to plant roots. I can personally attest to this balance system working based on the result of my manganese going from 8 ppm Mn to 68 ppm Mn having applied none, but aggressively having raised my K levels.
A high rate of broadcasted potassium is really no different than banding a crop removal amount. Whether you spread 800 lbs over the entire soil surface, or you put 80 lbs in a 3" strip every 30" it's the same rate where that product actually lands.