The Q&A Archives: Using Magnesium Fertilizer

Question: What role does magnesium play in having good watermelons? Does it make them sweeter or affect the size? Can you have too much magnesium in your soil? Where can you purchase magnesium and what form does it come in?. Ellen Craven Excelsior Springs, MO

Answer: The factors most affecting the size of watermelons is the variety and the availability of adequate water and nutrients. I have not heard of magnesium being a factor in either sweetness or size. It's best to have a soil test done before applying magnesium fertilizer; too much magnesium may affect the availability of calcium to plants. You can contact your Cooperative Extension Service for soil testing information; their number is (816) 792-7787. A good source of magnesium for acidic soils is dolomitic limestone. For alkaline soils, use epsom salts (magnesium sulfate)..

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