Greenhouse Growing Log
Turn a greenhouse from a place things happen into a place with a record, so a bad germination or a lost crop can be traced back to the week it went wrong.
GG-03 1 page
Growing results and crops · GR-17
Hydroponic Nutrient Solution Log
A free printable hydroponic log: pH, EC and solution temperature for one reservoir, against your own target ranges, with top-ups, full changes and calibrations.
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2 pages. Choose your paper size — both versions are laid out identically, so neither one gets shrunk to fit.
Print it and write on it
Fill it in type and save
The fillable versions have real form fields — open them in any PDF reader, type into them and save. Printing help.
What this sheet is for
Spot pH and EC drift in a reservoir before the plants show it, with every reading on one log. Clean-outs and meter calibrations are kept with the readings they affect.
Who it is for
Home and small commercial hydroponic growers running NFT, deep water, drip or ebb and flow systems.
How to use it
- Write the system, reservoir volume, crop and nutrient, and your own target ranges, from the nutrient maker or the guidance you grow by.
- Read pH, EC and temperature at the same time each round, before adding anything.
- Note the water, nutrient and pH adjuster added, and mark any full change.
- Tick when the meter was calibrated, and note what the plants are showing.
- On page two, log clean-outs and calibrations.
What is on the sheet
2 pages, in this order:
Page 1
Printed under the title: One reservoir's solution read at the same time each round: pH, EC and temperature, what was added to it and every full change, so drift shows up in the numbers before it shows in the leaves.
Your ranges, written in. No target pH, EC or temperature is printed here. The right ranges depend on the crop, its stage, the system and the nutrient, so take them from the nutrient maker or the guidance you grow by, write them in the boxes below, and change them as the crop moves on.
Write-on lines: System and type · Reservoir volume · Crop · Nutrient product · Meter make and model · Last calibrated · Your pH range · Your EC range · Your temperature range
Readings and additions — readings first, then what you added
Table, 26 rows: Date · Time · pH · EC · Temp · Water · Nutrient · pH adjust · Change · Cal. · Plants
Page 2
Clean-outs and calibrations — the reservoir emptied and cleaned, or the meter checked
Table, 7 rows: Date · Job · What was done · Product or standard · By
Questions
Why are no pH or EC ranges printed?
Because they depend on the crop, its stage, the system and the nutrient, and different makers give different figures. Write your own ranges in the boxes at the top and change them as the crop moves on.
Why read before adding anything?
Because the reading before a top-up is the one that shows drift. A reading taken just after adding water or nutrient shows the correction, not the trend.
Why log meter calibrations?
A meter that has drifted gives readings that look fine and are not. Noting each calibration beside the readings shows which figures you can trust.
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