Nutrient availability versus total sampled levels?

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Green
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Nutrient availability versus total sampled levels?

Postby Green » June 15th, 2018, 11:57 pm

Andy, for the tests that Logan does, and the interpretations using your method, how do you differentiate between total soil levels of something like P, K, or Ca, versus the actually plant available levels? I keep reading articles that say that much of the nutrient reserves in soil may not be actually available because they might be bound to other things. But surely your analysis method in combination with Logan's testing tries to predict what's actually available, and optimize availability over the long-term.

Can you shed a little more light on how big a deal this topic is in lawn care?
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andy10917
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Re: Nutrient availability versus total sampled levels?

Postby andy10917 » June 16th, 2018, 12:46 am

It's way too complex for a mid-season topic. I could go on for quite a while.

Save this one for November, when the site is quiet. We'll discuss it in detail...
Green
Posts: 5880
Joined: September 14th, 2012, 10:53 pm
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Re: Nutrient availability versus total sampled levels?

Postby Green » December 1st, 2018, 2:05 am

Andy,

Bringing this back so I can learn some of the background over the coming months. Feel free to jump in whenever you're ready...
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andy10917
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Re: Nutrient availability versus total sampled levels?

Postby andy10917 » December 1st, 2018, 10:01 am

Good idea! I'm in - and it's a really good time to explain some of the "philosophy" that I use in the overall recommendations that I create. You may be disappointed in that there aren't strict formulas that you can execute yourself - my approach is I call "HELM", which is my last initial (first letter of my last name plus "Empirical Level Management"). That means that I don't blindly look at numbers on the Logan tests and automatically translate them into recommendations. Why? Because it doesn't work. What DOES work is listening to what happens when we apply nutrients and seeing how the turfgrass responds. For my own lawn I measure the presence of sugars being produced by the grass plants as an indication of whether the lawn is responding or not.

This is going to be a long thread - I hope that's what you're looking for, and not easy-peasy quick formulas to apply...
Green
Posts: 5880
Joined: September 14th, 2012, 10:53 pm
Location: CT (Zone 6B)
Grass Type: KBG, TTTF, TTPR, and FF (various mixtures)
Lawn Size: 10000-20000
Level: Some Experience

Re: Nutrient availability versus total sampled levels?

Postby Green » December 1st, 2018, 7:03 pm

andy10917 wrote:
December 1st, 2018, 10:01 am
Good idea! I'm in -
......
This is going to be a long thread - I hope that's what you're looking for, and not easy-peasy quick formulas to apply...
Yes, that's the idea. Go as far in depth as you'd like, as long as it's presented in a logical way that builds on previous concepts. Also, feel free to mention the sources you're most interested in that helped you learn and eventually create your own method...whatever you want to do, is fine with me. As much as you want to talk about, and I'll read it.

Now, just so you know...I may not generate a lot of responses initially or at regular intervals after you make each post. Feel free to keep going whenever you think of something that makes sense to post. That said, I WILL be reading and re-reading and processing what you're writing on a regular basis, even if I don't reply immediately all the time.

That said, I'll definitely have lots of follow-up questions from time-to-time after I think carefully about some of the things you present. But there will probabably be intervals of nothing from me at times while I'm processing, looking up more info on certain ideas, or seeking definitions, etc.

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