On Apr 6, 7:51 am, "skunker" wrote:
Okay folks,
Sent some soil out to get tested by my local Extension and I am a
little confused about what the results mean. I've linked them here.
Can someone go through each one and tell me if it's bad/good and what
I need to do?

From the top:

- pH is high, not dramatically so but at 7.9 there are quite a number
of plants that will not thrive. pH is a measure of acidity going from
0 (toxic acid) to 7 (neutral) to 14 (toxic alkali), many plants like
slightly acid (6-6.5) to absorb nutrients well, some like it lower
(4.5-5.5). I don't know about the grass you have but you need to
check out what it likes. A few plants will like your alkaline
conditions. As the bottom line says DO NOT add lime, it will make it
worse. I don't know San Antonio, is it a limestone area or an
evaporation basin? The high pH and high Calcium suggest that it may
be.

- Conductivity This is a measure of the total soluble salts. High
levels kill plants (eg by the seaside) but yours is OK if I am reading
the units right

- The major nutirents (Nitrogen down to Sulphur) are all above the
critical level except N which they recommend you add a Nitrogenous
fertiliser to correct. This is a generalisation as different plants
like more or less of these nutrients and I cannot tell if they took
into account what you are growing to set this level, I suspect not.
Grass likes Nitrogen but don't overdo it.
- Minor nutrients, Iron to Boron, tests don't seem to have been done.

- Limestone is not required as I said your soil is already alkaline

- Organic matter 5% Is a bit low. Good rich soil it would be higher.

What to do? To grow grass add a Nitrogenous fertiliser. When you cut
it mulch it up and leave it to rot in, thus improving the amount of
organic matter. If you want to topdress use a compost that has NOT
got lime added, you don't care if it is somewhat acid (which most
compost will be naturally) as your soil will improve if it is.

If you have garden beds and not just grass you may need to take
further steps to increase acidity to grow acid-loving plants, it may
be simpler to just plant lime-loving plants instead.

David