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Better Farming
October 2016
Farm News First >
BetterFarming.com49
CROPS:
THE
LYNCH
FILE
(phosphorus) and K (potassium)
levels. This can be partially explained
by seasonal changes. What was really
dramatic was the change in pH. It
varied by a whole point and ranged
from 7.4 to 8.4 over the 12 months.
At the time I was working with
Dale Cowan, CCA ON, who was man-
ager-owner of Agri-Food Laborato-
ries. He graciously also sent me the
results of the standard. Every sample
that is analyzed is placed on a tray
with a check sample, which is the
standard. This check sample is taken
from a tub of soil and used to detect
any abnormalities in the tests. It was
interesting that the analysis of this test
soil also varied over time.
How could the check sample vary
in its analysis? The answer is lab
variability. “The best a lab can do is
have 25 per cent variation in samples,”
says Cowan.
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