Slownickel lounge, pull up a chair. CEC interpretation

[Hermen_eutics]

Ca-85.8
Mg-9.4
K-3.7
Na-.94

Buffer pH isn't calculated when the pH is @ 7.

Ca is based on [email protected], K and Mg are M3. Na is highest whether m3 or [email protected].

Calcium numbers on the m3 tests are over estimated, that is why the USGA started using AA for Ca numbers in the base.

Looking at Hermans results, You need lots of P, Your micro's are crazy high... Cu is way high and Zn is above the normally rec. maximum...

Add P, a touch of K to get to 4.5%, run it and see what happens.

Thanks so much GC. I took me a while to grasp these basic calculations but i finally ended up with the same sums you show. An actually hugely useful lesson for which i am very grateful.

Im puzzling over how i got Zn level so high. Also with my Ca at 85% should i still microdose Ca through veg and initial flowering?

Thanks bro

 

[bsgospel]

http://documents.crinet.com/AgSourc...nomy/F-10944-15-v2Base-Saturation-GENERIC.pdf

Here's another one-sheet which puts the calculations into a digestible table. Take the fert recommendations with a grain of salt (haha) and also note that Spectrum will calculate/factor slightly differently for their methods. The over-estimation of Ca is noted here and that is why you use the AA8.2 number. Thanks for explaining growing crazy. I forgot that Slow used that number and I never really knew why.

 

[Guest]

https://documents.crinet.com/AgSour...nomy/F-10944-15-v2Base-Saturation-GENERIC.pdf

Here's another one-sheet which puts the calculations into a digestible table. Take the fert recommendations with a grain of salt (haha) and also note that Spectrum will calculate/factor slightly differently for their methods. The over-estimation of Ca is noted here and that is why you use the AA8.2 number. Thanks for explaining growing crazy. I forgot that Slow used that number and I never really knew why.

Link doesn’t work for me on iPhone

 

[Bradley_Danks]

I'm starting a new project on a native soil plot and this is the lab results that I got back. It blows me away that the iron level is over 500 PPM. I'm hoping if I balance the zn, mn, b, cu and add a lot of gypsum it won't be too bad. This property had been farmed on and off over the last century but it has sit fallow with a top cover for the last few years. It doesn't seem like much leaching has occurred and its a few years ahead of the Virgin native soil I tested in the past. Not sure why my partner got an irrigation test from this lab but I'm going to get the water retested at Spectrum. I wonder if the water spiked the iron or if the lab test is erroneous. I'm thinking about retesting the soil too. Thoughts or ideas?

 

[growingcrazy]

What depth was that sample taken at?

 

[Bradley_Danks]

What depth was that sample taken at?

I used a soil probe with about a 7 inch depth from 6 sample areas in about an acre that had similar soil type. Then I used a kitchen sifter to sift my sample once I dried it then I sent in a hundred grams to the lab.

 

[slownickel]

I used a soil probe with about a 7 inch depth from 6 sample areas in about an acre that had similar soil type. Then I used a kitchen sifter to sift my sample once I dried it then I sent in a hundred grams to the lab.

Not only is your iron high, but look at the aluminum.

Don't ignore that aluminum.

What color is this soil?

As well, you need to request the indexed Mn and Cu. Then run your ratios, with and without Al.

(Fe+Al)/Mn

 

[slownickel]

Using what I think is the correct method to calculate
K 932=3%
Mg 1136=9%
Ca 16200=84%
Na 753=3%

IF I calculate correctly. Na is high but I have been leaching soil and have cut run off numbers for conductivity and salinity by almost half.

K% Mg% Ca % Na %
2.49% 9.75% 84.35% 3.42%

I think your sample was full of gypsum.

There is more Na than K. Not good.

 

[Hermen_eutics]

Hey Mike,

I asked spectrum to post my followup anslysis to your account. Could you please take another look and share your thoughts on this newer data.

 

[lockjack]

agreed, the foliar will be super happy - but once flowering then options change - attack from all sides, for sure

Slow, Have you ever used this product

https://andersonshumates.com/products/#HumicDG

..

I am using this. It is suppose to be 70% humic acid and soluble enough to spray. The dg is the dispersing granule technology for golf greens. Since it is for golf it comes in greens grade of 100sgn or 75sgn if you can find it which is nice. Spreads evenly on little pots in flats but I am probably using too much.

Greens grade gypsum is nice to work with too. I use Kelly's don't know if it is any good.

 

[Guest]

K% Mg% Ca % Na %
2.49% 9.75% 84.35% 3.42%

I think your sample was full of gypsum.

There is more Na than K. Not good.

Yesterday I dumped bags on a big tarp and added about another cup per CF of gypsum and put back in bags. I’m running 2 gallons of distilled/RO water through each slowly.

Checking run off the conductivity and salinity are still coming down. Seedlings are a week or so away from needing to go into the bags so I figure I can do this at least twice more.
Reading up on what I can add for K that won’t add more Na. My ppm of Ca, K, P, and Mg is high regardless of the percentage ratio but I’m guessing that doesn’t matter unless I can get more Na leached out. Quickly.

Maybe MPK since it’s got a low salt index.

 

[Arnold.]

Guys,

Could you look at my reasoning here beneath?
My calculations says I need to use only this little gypsum to the potting soil. But I’m doubtful if I can trust them.

I tried to calculate how many gypsum (and TSP) I would need to add to my potting soil which I got tested. These calculations says to use about 17g of gypsum on 5 gallons of potting soil. This seems a lot less than I would have imagined after reading this thread
I’ve seen Slow mentioning 300g of gypsum for 7 gal. Or 1 cup for 5gal.

My reasoning (with fault??):
I want to add 1845ppm of Ca to this potting soil. With gypsum being 22% of Ca in weight I have to add 8380ppm of gypsum.
Since the K3 procedure measures ppm in weight. This means I have to add 0.008380g of gypsum for each g of dried and sieved soil (just like the sample I sent in).
Then I weighed a sample volume of soil, oven dried and sieved it before weighing again. This way I could calculate the conversion factor from the dry, sifted soil to the wetter soil straight out the bag.
5 gallons of soil would weigh 2kg, thus needing 16.7g of gypsum.

Am I overthinking this and does this soil indeed only needs a dust of gypsum?

 

[Arnold.]

BASE SATURATION
Ca 64.7%
K 10.1%
Mg 16.3%
Na 2.6%

with the CEC +12(bpH-7) like on the spectrum pages.

 

[Arnold.]

I'm thinking about adding this to this soil, then mix it with low EC coco and pumice.
1164ppm P with tripel super phospote
3370ppm Ca with TSP, gypsum, Mearl (CaCO3)
2.6ppm B
100ppm Mn (+ in feeding)
50ppm ZN (+ in feeding)

 

[Bradley_Danks]

Not only is your iron high, but look at the aluminum.

Don't ignore that aluminum.

What color is this soil?

As well, you need to request the indexed Mn and Cu. Then run your ratios, with and without Al.

(Fe+Al)/Mn

I thought the Al wasn't available but there must be more to it. Soil color is brownish reddish like typical native Jory soil around here.

The indexed manganese is 39.2 and the indexed copper is .8

When I called Spectrum and got the indexes I asked them what you meant about running your ratios and that equation they didn't know what you mean and I don't either. What's it all mean slow?

 

[Hermen_eutics]

These beans were popped in the soil that has the feb 2018 test. Seeds planted in soil on 2/2, broke ground on 2/6. This is nice root growth that is gonna blow up as i pot up.







In my experience plants growing under 3500k start a little slower than 5-6k but these still will get to be full 7-10 gal frosty beauties.

 

[EasyGoing]

Guys,

Could you look at my reasoning here beneath?
My calculations says I need to use only this little gypsum to the potting soil. But I’m doubtful if I can trust them.

View Image

I tried to calculate how many gypsum (and TSP) I would need to add to my potting soil which I got tested. These calculations says to use about 17g of gypsum on 5 gallons of potting soil. This seems a lot less than I would have imagined after reading this thread
I’ve seen Slow mentioning 300g of gypsum for 7 gal. Or 1 cup for 5gal.

My reasoning (with fault??):
I want to add 1845ppm of Ca to this potting soil. With gypsum being 22% of Ca in weight I have to add 8380ppm of gypsum.
Since the K3 procedure measures ppm in weight. This means I have to add 0.008380g of gypsum for each g of dried and sieved soil (just like the sample I sent in).
Then I weighed a sample volume of soil, oven dried and sieved it before weighing again. This way I could calculate the conversion factor from the dry, sifted soil to the wetter soil straight out the bag.
5 gallons of soil would weigh 2kg, thus needing 16.7g of gypsum.

Am I overthinking this and does this soil indeed only needs a dust of gypsum?

View Image

I fart more gypsum than that daily.

 

[Badfishy1]

I'm starting a new project on a native soil plot and this is the lab results that I got back. It blows me away that the iron level is over 500 PPM. I'm hoping if I balance the zn, mn, b, cu and add a lot of gypsum it won't be too bad. This property had been farmed on and off over the last century but it has sit fallow with a top cover for the last few years. It doesn't seem like much leaching has occurred and its a few years ahead of the Virgin native soil I tested in the past. Not sure why my partner got an irrigation test from this lab but I'm going to get the water retested at Spectrum. I wonder if the water spiked the iron or if the lab test is erroneous. I'm thinking about retesting the soil too. Thoughts or ideas?


View Image

View Image

Do you know if said land grew same crop year after year or were the crops rotated? In the south of murica when cotton was grown year after year, the soil became depleted of certain nutrients and created the ‘dustbowl’ It wasn’t until booker t Washington introduced peanut farming to these lands that they were able to support cotton growth again. Not positive but perhaps this could be the reasoning behind such high levels of iron. Just a thought

 

[Arnold.]

I fart more gypsum than that daily.

Haha
That's what I thought.

But if I can't calculate how many gypsum this soil need, I have to get back to guessing. I like the calculating better. Did you see a mistake in my reasoning?

 

[jidoka]

I forget your numbers. But you gotta also add enough to run off excess k, mg, na

Plus dirty little secret, all of the organic material holds both anions and cations. It goes unaccounted for in cec calculations

If you are feeding like slow suggests plan on adding the equivalent of 1000 lbs/acre yearly