Chrysanthemums in Aberdeen

by Eric Anderton

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- Electrical Conductivity 

- Nutrition

- Osmosis

- pH Control

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Date last updated: 
03 April 2012


Chrysanthemum Hydroponics
By Eric Anderton

Electrical Conductivity

Hydroponic growers must understand this important subject. It enables us to regulate very accurately the strength of the nutrients in water solution that we apply to our plants.

In very simple terms water conducts electricity to different levels due to the amount of salts dissolved in it. The levels can be measured with an EC meter made specially for the purpose.

The meter is one of the few essentials for hydroponic growers. Two suitable and convenient types for small growers are shown in the photographs. The truncheon type does not require calibration, the other does frequently and has a battery. The unit of measure on this type of meter is usually expressed as milli siemens (MS).

Pure water gives a reading of 0.00 MS

Reverse osmosis water gives a reading of 0.00 (not filtered water !)

Rain water varies a little depending on amount of salts acquired passing through the sky, different locations etc, mine reads 0.02 MS.

Tap water varies quite a lot depending on source and how treated by Water Undertaking. Mine reads 0.06 MS. Some tap water has a much higher EC.

Salty water would have a very high EC, not suitable for plants and humans to drink.

The amount of salts contained in tap water and rainwater have little or no value for the nutrition of plants, but they do need consideration in the final and total solution strength administered to plants.

Obviously special hydroponic nutrients for plants are added to the water supply source and again this can be accurately measured and regulated continually at each and every phase and stage of growth.

The residual level of the water supply must be accounted for in the final total EC value as mentioned above.

i. e. If the value of the solution required for feeding the plants at a particular stage of growth is say 1.00 MS then only enough nutrient must be added to the residual water to bring the total to 1.00 MS.

Example: Residual water source 0.10 MS, nutrient source 0.90 MS =1.00 MS total.

Chrysanthemums require feeding at different strengths at different stages of growth. This will be discussed under NUTRITION. 


Links to pages where you can view magnified images of Eric's Anemone Seedlings.

Anemone Close-ups

Diamond encrusted Anemones


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Copyright 2012 Paul Barlow/Eric Anderton.