Magnesium Source for Tomato Plants
Name: Albert D.
the glasshouse to growing tomatoes organically. At present the whole
nursery is under hydroponics with a complete nutritional feed formula
that includes magnesium sulphate for supplying magnesium to the plants
which they need in fairly high quantities for high production. This will
not be permitted under the rules for growing organically but if the raw
material from which MgSO4 is extracted does not contain material which is
deleterious to the plants then this crude material may be used. It will
be less potent but will nevertheless supply the element required. Do you
know the contents of the crude material and even where it is "mined"
these days. It used to be in the Epsom area of England hence it's common
name of Epsom salts. An answer to this query will be greatly
Not being familiar with the "organic growing" rule book, I can't comment
specifically; however, magnesium is available in many "naturally-occurring"
minerals. The web site is a definitive reference regarding these mineral
sources of magnesium.
Click here to return to the Botany Archives
Update: June 2012