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Low PH and wet soils
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southernokie
Posted 10/22/2012 13:39 (#2654653 - in reply to #2650961)
Subject: RE: You nailed it Hayinhere.........


rebuilder - 10/20/2012 07:38

....and I have the soil tests to prove you right!

New farm for me and very wet! Very little tile added (yet there were three large county tile running through to hook to)! I have a field next to this which I would routinely be planting or harvesting, on mine while the new field would have a couple of feet of water standing.

To add to that.... other than Nh3 & some starter for corn.........I never remember seeing a dry spreader there in my memory ( well over 30 years).

I have attached the soil test results below......


Looks like I have my work cut out for me......

Note: sample with an (s) denotes a subsoil sample.

Note2; tile was installed on this farm this spring every 60 foot. (see pic)

Note 3: Cyst nematodes are through the roof. Samples contained counts of 212 cysts/42,000+ eggs  (anything over 10 cysts & 2,000 eggs is considered High)!! My lowest sample contained 37 cysts/ 6,600 eggs!



If one takes the time to sort that spreadsheet data by %Mg and then by %Ca then it is obvious Mg is holding up the pH until Ca hits 80+%. On the low end of pH both Mg and Ca are quite deficient. So my guess it that dolomitic lime has been used on this field exclusively? Or there are over-riding soil factors precluding the leaching of excess Mg?....sulfate program?...gypsum program?

Here....I can find the depth of Mg problem with a sharp probe (like a skewer) in summer when soils are beginning to dry pretty good...like hitting the proverbial 'brick wall'....Ca not Mg makes a huge difference in tilth here....a BIG reason we forego the dolomite quarries in favor of high cal lime even if grind is a bit coarse. But in contrast to your soils we have too high native Mg levels....soils are loams to silt loams with 50s% silt, 4% OM and 10-15 CEC.

Mg holds water and some blame magnesium ortho phosphate-22H2O http://blog.calciumproducts.com/posts/calcium-magnesium-ratio.cfm I don't know about that....all I do know, there is a difference in tilth above and below 15% Mg based on what I see and feel. Tile is not an option!
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