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Slownickel lounge, pull up a chair. CEC interpretation

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plantingplants

Active member
Your bed soil cec saturation using aa8.2 Ca:
Ca: 62.8%
Mg: 26.4%
K: 9.5%
Na: 1.3%

Native:
Ca: 71%
Mg: 17.3%
K: 11.1%
Na: 0.6%

And your native has a 1:3 fe:mn ratio!
 

led05

Chasing The Present
So I got the first two soil analyses back from Spectrum yesterday.

Here's the results for the amended beds:
View Image

And here is the native soil they're built on:
View Image

My first impression is that I need to be careful about adding lime, especially with Mg in it, and that I probably want to keep adding gypsum to knock off more K.

As this is my first go-round with testing, though, I could really use some input from those of you who've done it a time or two.

EDIT: The amended beds have received mostly a dairy-manure-based certified organic compost (also contains rice hulls), crushed cinders, oyster shell, gypsum, and a little bone meal. They have also been mulched with straw and cover cropped with clover and ryegrass.

You have near perfect Native soil (as good as anyone could expect) and if I recall you're water was like what, 42 TDS - where are you --- Lucky Dog !!!
 

mapinguari

Member
Veteran
You have near perfect Native soil (as good as anyone could expect) and if I recall you're water was like what, 42 TDS - where are you --- Lucky Dog !!!

"Lassen's Shadow" lol...western slope of the Sierra-Cascade interface, pretty good spot overall.

I must suck at growing because I haven't gotten the yields I'd like to see from this soil...

Thanks for the positivity.
 

jidoka

Active member
"Lassen's Shadow" lol...western slope of the Sierra-Cascade interface, pretty good spot overall.

I must suck at growing because I haven't gotten the yields I'd like to see from this soil...

Thanks for the positivity.

Dig up about 80 yards of that and send it to me for extensive testing :tiphat:
 

led05

Chasing The Present
"Lassen's Shadow" lol...western slope of the Sierra-Cascade interface, pretty good spot overall.

I must suck at growing because I haven't gotten the yields I'd like to see from this soil...

Thanks for the positivity.

I'm sure you don't suck!

In all seriousness though. Your water is so clean it's likely leeching some of that good you do have in your native and mix and somewhat negating each other at the root zones

Top dressing of Gypsum as Jidoka I think said is a good idea and maybe a couple other dressings annually could help balance out.

Your water is so clean I'd be spiking that as well but that's just me.
 

slownickel

Active member
ICMag Donor
Veteran
So I got the first two soil analyses back from Spectrum yesterday.

Here's the results for the amended beds:
View Image

And here is the native soil they're built on:
View Image

My first impression is that I need to be careful about adding lime, especially with Mg in it, and that I probably want to keep adding gypsum to knock off more K.

As this is my first go-round with testing, though, I could really use some input from those of you who've done it a time or two.

EDIT: The amended beds have received mostly a dairy-manure-based certified organic compost (also contains rice hulls), crushed cinders, oyster shell, gypsum, and a little bone meal. They have also been mulched with straw and cover cropped with clover and ryegrass.

Wow! Get a mix and bagging line started!

Unbelievable analysis of native soil.

There is a lot of carbonate in there. Do not add lime by any means.

How loose is this soil? Does it come out in clumps?
 

mapinguari

Member
Veteran
Wow! Get a mix and bagging line started!

Unbelievable analysis of native soil.

There is a lot of carbonate in there. Do not add lime by any means.

How loose is this soil? Does it come out in clumps?

What a nice surprise to see how well the native is balanced.

This is Cohasset gravelly loam, which is usually fairly acidic according to the series description.

Nearly pullled the trigger last week on some local lime that's got a fair amount of Mg in it. That looks like it would have been a mistake.

Reviewing Solomon to figure out how to proceed, it looks like a good bit of gypsum is in order. Sulfur's already pretty high, but he says there's only a minimum S number for calcareous-type soils.

On the other hand, he says to limit gypsum applications to 1 ton/ac, which is far too little for my situation. Some guy named Mike Kraidy is quoted there as saying that multiple tons of gypsum per year are sometimes appropriate, so that's where I think I'm headed.

As to the clumpiness: the samples I pulled for the test had a decent crumb to them, but in some areas I've encountered a tendency to form heavy clumps with this soil.

Thanks to those who've chimed in, I appreciate the feedback. :tiphat:
 

slownickel

Active member
ICMag Donor
Veteran
On the other hand, he says to limit gypsum applications to 1 ton/ac, which is far too little for my situation. Some guy named Mike Kraidy is quoted there as saying that multiple tons of gypsum per year are sometimes appropriate, so that's where I think I'm headed.

You should ask Steve Solomon what he thinks now about my recommendations of multiple tons after having run tests in his yard haha....
 

mapinguari

Member
Veteran
slow, do you personally abide by an annual limit on additions of gypsum?

In my case, should I just figure out how much I think I'll need to get the excess cations off and add it all at once?
 
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