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Can this be accurate- Soil Test

Posted by foodeefish z8SC (My Page) on
Sun, Jan 26, 14 at 12:43

I just received my Vegetable Garden Soil test from Clemson University and their suggestion is to add NO lime, and to only add 6#s Calcium Nitrate per 1000 Square Feet.
I was going to add composted oak leaves but now I don't know what to do.

Here are the results:

PH- 7.4

lbs per acre

Phosphorus(P) - 166 Excessive
Potassium(K) - 430 Excessive
Calcium(Ca) - 9868 Excessive
Magnesium(Mg) - 1081 Sufficient
Zinc(Zn) 336 Sufficient
Maganese(Mn)-121 Sufficient
Boron(B) - 5.7 Excessive
Copper(Cu) - 0.2
Sodium(Na) - 90

Any ideas as to what I should do or if this can be accurate? PH 7.4 and don't add any Lime?? I thought Lime decreased the PH and that I needed a PH of 6.8-7.2 for vegetables? If I add composted leaves won't that just raise the PH even higher?

Follow-Up Postings:

RE: Can this be accurate- Soil Test

If your soil test is fairly accurate, you should not add calcium lime as that raises the ph. Sulfer lowers ph. I don't know how to lower boron except by water leaching.

Leaves likely are neutral to slightly acidic....ok.

RE: Can this be accurate- Soil Test

  • Posted by ericwi Dane County WI (My Page) on
    Sun, Jan 26, 14 at 16:50

Composted oak leaves should add vegetable fiber, also called organic matter, to the soil, and this is usually a good thing. It is possible to have too much organic matter in the soil. Have you grown vegetables in this plot before? If so, what were the results? Based on the soil test results, I agree, no lime should be added. If you think that nitrogen is needed, then ammmonium sulfate will provide nitrogen, and also lower soil pH. However, the indicated pH = 7.4 is good for growing vegetables, and I might not do anything to lower it, if it were my garden.

RE: Can this be accurate- Soil Test

  • Posted by glib 5.5 (My Page) on
    Sun, Jan 26, 14 at 17:34

Looks like the place has been overmanured for a long time. Yes, add leaves only for five years, and urea or other N only fertilizer.

RE: Can this be accurate- Soil Test

I guess the chicken manure the last couple of years may have been too much. I have plenty of leaves composting and I just added some alfalfa pellets as greens to get it composting.

I'll wait a few weeks and add them to the garden.


RE: Can this be accurate- Soil Test

A soil pH of 7.4 is not really all that far off the optimal 6.0 to 6.8 pH so it is not something that I would be too concerned about. Lime, Calcium Carbonate, is used to raise a soils pH not decrease that pH.
What is the amount of organic matter in that soil?
How much chicken manure, over how much area, has been added?

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