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Root zone
Monitoring
Many growers growing in media are
overly focused on the irrigation water EC and pH whereas
it is much more important to consider is the EC, pH and
moisture content of the root zone. By measuring the
root-zone variables the irrigation EC, pH and quantity
can be adjusted to suit.
Interestingly, the root zone (and run-off) EC is
affected by both the irrigation EC and the irrigation
quantity. If irrigation quantity is reduced then salts
build up in the root zone and the EC rises. Normally the
run-off EC can be expected to be as much as about 1ms/cm
(10CF) greater than the irrigation EC but if it rises
much more than this it can severely stress the crop and
even cause it to wilt.
Click
For full article by Jeff
Broad
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