How much Mg/Cal to add to a normal feed.

[Masdyman]

Hi , I have run out of MSU feed and cannot get any for a few months .
So am going to use a tomato feed or another feed over winter and add Magnesium & Calcium .How can i work out how much of the two is required so the levels are roughly the same as the MSU feed ?
What should i do to get me by ?

[kavanaru]

why don't you use Peters Excel fertilizer? It's very similar to MSU and available in Europe... a link where to buy it from Germany Artikelübersicht Dünger - Orchideen Zentrum Wichmann

I am sure you can also get it in UK!

[Masdyman]

i will consider this thanks

[Orchid126]

It's my understanding that most tap water sources contain calcium. Therefore, it's only necessary to add magnesium, in the form of epsom salts. Usually it's a tablespoon to a gallon of tap water. Someone please correct me if I'm wrong.

[got ants]

Using the search function, this is the latest thread regarding the use of Epsom Salts. I am considering it because of a few factors...

A month ago I over fertilized and burnt many plants. After flushing heavy, I have not fertilized in 30 days (normally once weekly/weakly)

We've had monsoon rains and the only water I've been using is collected rain water.

And since some of the leaves look yellowish, I wanted to give a green boost without fertilizer.

So I am considering using Epsom Salts as a boost, and return to my routine of fertilizing in a week or two. One tablespoon per two gallons/ 2.5 tablespoons to 5 gallon bucket.

Yeah, or nay?

[johnblagg]

I use epsom salts about once a month while chids are outside perhaps twice a month indoors in winter ..lol dont know why I do more indoores but I do ...

I use a teaspoon per gal and the reason is I do s/h so it stays in the res for a while so they actuaslly have a long time to adsorb it and dont need so much

[got ants]

Thanks John, it poured again last night, hopefully they'lll dry out today, it's supposed to be dryer over the next couple of days. All I seem to be doing is fungicide every two or three weeks.

[Ray]

I have an article on my "Free Information" page on Magnesium Supplementation that explains how to match the MSU formulation with Epsom Salt. You can use a similar calculation for the calcium.

[got ants]

A little late Ray, I had a dry day and went ahead and did 2 Tbspn to 5 gallons of rain water.

Do I need to flush this out?

[Ray]

Naaahhh. Epsom salt is a relatively innocuous chemical. I've used a tablespoon per gallon without issue.