ANALYSIS – Feed Water Analysis

Feed Water Analysis

Feed water analysis involves analysing the actual feed water contained in the feed tank or drain water that has passed through the substrate. Feed water can also be taken directly from a substrate, such as rock wool slabs, using a sample syringe. Analysis of drain water allows you to determine what the plants have absorbed and what that have not absorbed, which is often more important.

This type of analysis determines the following values.

Acidity

pH

EC – Electrical Conductivity

mS/cm 25°C

 

 

Cations – mmol/l

 

Ammonium

NH4+

Potassium

K+

Sodium

Na+

Calcium

Ca+

Magnesium

Mg+

Silicon

Si+

 

 

Anions – mmol/l

 

Nitrate

NO3

Chloride

Cl

Sulphur

S

Bicarbonate

HCO3

Phosphorus

P

 

 

Trace elements µmol/l

 

Iron

Fe

Manganese

Mn

Zinc

Zn

Boron

B

Copper

Cu

Molybdenum

Mo

 

 

For this analysis, we need 250 ml of the type of water you want to have analysed, such as feed water or drain water. Remember to give the sample a name such as ‘drain water, young chrysanthemums’ or ‘tomato drain greenhouse 1’. We will then add a number code. The name and number will then be stated on the analysis results.

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