[tturc]

Yesterday, rather foolishly, I sprinkled 5kg of Magnesium Sulphate to the ground between my potatoes (4mx4m), and watered it in.  There was no information on the packet about quantities and I couldn't find anything in the books or online.  The yellow and brown leaves closely match the symptoms of magnesium deficiency, and there's nothing to suggest blight.  But now I'm worried I may have overdone it, help!  Does anyone know what's the recommended quantity, and what the impact of applying too much would be?

[noshed]

5 kilos is a lot. A handful per sqm would probably have done. Let us know what happens - you have an experiment on your hands!

[karooba007]

in the long run your soil will be fine as it will wash out 

[karooba007]

i wasn't sure how much to use as well. the site manager told me to use an ounce per square yard. i think that was two little and I ended up using more.

[Aunt Sally]

The only harm you've done is wasting money 

It can be used as a foliar feed at 2oz per gallon of water.

[tturc]

Thanks, but will the excess Magnesium wash away or might be children grow two heads if they eat them?!

[Aunt Sally]

It will wash away,  it's quite safe to eat 

[8doubles]

Magnesium sulphate aka epsom salts. I think two heads would be preferable to the effects of an overdose.