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Old 08-27-2007, 03:57 PM
trayz trayz is offline
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Soil test

Received soil test and it states my ph as 4.8. I have high magnesium and calcium levels, and very high potassium levels. I have low phosphorous levels. I am growing centipede and st. augustine grass. My CEC is 4.6-9.0 cmolkg. I have just added 50lb lime/1ooosqft of diplomic ( all we have here). I plan on adding 3lb/1000sqft bonemeal in fall. I am worried about the high magnesium and calcium levels. Would like all ideas on how to reach the perfect soil.
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Old 08-27-2007, 10:41 PM
Smallaxe Smallaxe is offline
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I always thought that high calcium equals high ph. Or at least a higher ph. Bonemeal is supposed add the phosphorus, of course, and perhaps being organic would encourage the friendly fungus that makes it available.
Being this far north I know nothing of your grasses, but will be interestted in theories about how correction may be made.
How does the grass look?
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Old 08-27-2007, 11:07 PM
trayz trayz is offline
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The grass is average, just not very aggressive. Had bad grey leaf spot this year but stopped it with cornmeal. I have not seen anything in my research with both high calcium and high magnesium; and low Ph. Would love ideas.
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Old 08-30-2007, 11:11 AM
Kiril Kiril is offline
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[QUOTE=trayz;1944445]I have high magnesium and calcium levels, and very high potassium levels. I have low phosphorous levels./QUOTE]

Is this your determination or the labs?
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Old 08-30-2007, 11:50 AM
trayz trayz is offline
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The labs , Calcium H 1110, magnesium H 158, potassium VH 403, phosphorous L 15. Came from Auburn University.
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Old 08-30-2007, 02:25 PM
Kiril Kiril is offline
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Well, first thing I would note is those numbers (other than phosphorus) don't jive with what is known about nutrient availability at a given pH. Based on the numbers I would expect the pH to be around 8 - 8.5, not 4.8.

Did you have the soil tested before or after you limed?
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Old 08-30-2007, 06:13 PM
trayz trayz is offline
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Had soil tested, then applied lime that was recommended (50lb/1000sqft). I plan on applying the bonemeal this fall. Then another 50lb/1000sqft of lime this spring. How can I reduce the mag. and calcium levels (if they are too high)? I had two samples done and both were similar(one for the Centipede and one for the St. Aug.). I used a six inch piece of PVC pipe to get the soil samples.
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Old 08-31-2007, 12:18 AM
Kiril Kiril is offline
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Depending on the type of lime, you made the Ca/Mg problem, if there is one, worse not better. I would be tempted to let it sit over the winter and have the soil tested again before you lime to see how effective your fall treatments were.

Also be very cautious with bone meal. Very easy to over apply.

Also, if you can afford it and are interested, send samples to 2 different labs so you can compare the results. Naturally the samples need to be relatively identical for the comparison to have any real meaning.
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Old 09-02-2007, 12:01 AM
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Grass Happens Grass Happens is offline
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I'm currently enrolled in a soils class, so I'm trying to apply my reading.
Would adding gypsum help? calcium is salt-like right? and one uses gypsum to changes the ionic exchange of salt in soil. Or do i need to check over my notes again?
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Old 09-02-2007, 02:59 AM
Kiril Kiril is offline
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Quote:
Originally Posted by Grass Happens View Post
Or do i need to check over my notes again?
What you said.
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