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42
Maximum Yield
Solution testing
is particularly
important with
fruiting plants to
ensure sufficient
potassium is always
present for good
fruit quality.
Lab analysis of potting or container mixes
is often used in the nursery industry for
the production of ornamental plants.
Nutrient solution analysis returned from the lab usually
states the level of each element in either parts per million
(ppm) or mg/l (milligrams per liter) which are equivalent.
These, as well as pH and EC, should then be compared
back to the ideal levels of each element that the original
formulation or nutrient product contained. So, if a nutrient
solution was used that contained 150ppm N and the analysis
of the solution came back with 145ppm N, then this indicates
the initial level was approximately what the crop was taking
up. If the analysis report returned a much lower level, then
this indicates N needs to be increased in the nutrient solution
to account for the higher uptake rate. Along with nutrient
levels, unwanted elements such as the accumulation of
sodium or any trace elements in the water supply can be
checked with analysis reports, allowing replacement of
recirculating solutions when levels become too high, thus
reducing the risk of toxicity and growth issues.
“
KEEPING GOOD RECORDS of regular
laboratory analysis reports is another
important aspect of crop testing.”
Keeping good records of regular laboratory analysis reports
is another important aspect of crop testing and allows trends
to be seen as plants move through their life cycle or respond
to different growing conditions. If cost is an issue, the
most important lab test for any grower is the water supply;
this can determine if water treatment is necessary, if any
adjustment is required for nutrient solutions, and can help
identify potential growth issues before they occur.