Soil Preparation and Analysis
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Subject: Penn State Results; also how do you convert to ppm
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From
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Location
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Message
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Date Posted
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korney19 |
Buffalo, NY
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Has anybody else used Penn State for soil testing? How do you compare their results to many other results posted here that are in ppm?
They have a section "SOIL NUTRIENT LEVELS" with #'s in pounds per acre and a bar graph, followed by recommendations, and at the bottom of the sheet they have "LABORATORY RESULTS." Some units are meq/100g, some are %, and P is lb/A.
Is there a conversion between lbs/A, meq & ppm somewhere? I'll try to post #'s after I find out what they all mean, so please help on this. Thanks in advance.
Mark
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4/28/2005 1:45:53 PM
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Stunner |
Bristol, ME (stunner906@roadrunner.com)
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Divide lb/A by 2 to get ppm
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4/28/2005 2:12:01 PM
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Andy W |
Western NY
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except for phosphorus (4.6), and Potassium (2.4).
that's based on a 6-8 inch plow depth.
i'm not too keen on penn state tests (or cornell for that matter)
umass is the only college extension i would use, but i like the A+L's best. there are other good ones, too but those aree the big ones.
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4/28/2005 2:40:26 PM
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korney19 |
Buffalo, NY
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Thanks. Then maybe some of my #'s are off the charts.
When you say phosphorous & potassium, are you talking just P & K or P2O5 & K2O or don't it matter? Under the Soil Nutrient Levels, it lists P2O5 & K2O but in the Lab Results it lists P lb/A using the Mehlich 3 method.
Thanks. Mark
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4/28/2005 2:48:22 PM
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korney19 |
Buffalo, NY
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Here are the complete results, comments appreciated.
pH: 7.1
BELOW ARE lbs/A.
P2O5: 1855 K2O : 1320 Mg : 3682 Ca : 18689
LAB RESULTS:
pH: 7.1 using 1:1 soil:water pH P lbs/A: 810 (using Mehlich 3)
Exchange Cations (meq/100g):
Acidity 0.0 K 1.4 Mg 9.2 Ca 33.6 CEC 25.7
% Saturation of the CEC:
K 5.5 Mg 36.0 Ca 58.5
Organic Matter: 36%
Any help appreciated.
Mark
P.S. Andy, I'm right in the city, that means NO plow depth... but I did take samples at over 6" deep.
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4/28/2005 5:22:30 PM
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Tremor |
Ctpumpkin@optonline.net
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Andy's got it. Divide by 2 for 9" (plough depth).
Divide by 2.7 for true acre feet (12").
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4/28/2005 10:44:37 PM
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Tremor |
Ctpumpkin@optonline.net
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Ironically Penn State developed the finest testing methods in use today. But due to budget constraints, they don't use their own superior processes.
As for how they report, I prefer Pounds Per Acre to PPM as I can expalin the results & make recommendations to clients easier this way. As for the accuracy, there is no difference whatsoever.
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4/28/2005 10:46:48 PM
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korney19 |
Buffalo, NY
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So then what would you recommend?
Thanks. Mark
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4/28/2005 11:19:09 PM
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korney19 |
Buffalo, NY
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Can someone make comments on my results plus any recommendations?
Thanks in advance. Mark
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4/30/2005 3:28:31 PM
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Total Posts: 9 |
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