Does excess nitrate resulted in calcium deficiency?

Hi,

many aquarists have reported that some sensitive species of aquatic plants, e.g. Rotala macrandra, showed growth stunt or distorted new leaves when nitrate levels were too high. I know some people don't agree with me, but I did have the same experience on Rotala macrandra. Recently I have noticed a paragraph here:
http://en.wikipedia.org/wiki/Calcium_deficiency_%28plant_disorder%29

"Calcium (Ca) deficiency is a common disorder of plants on acidic soils, but more usually caused by unavailability rather than a shortage. This may be due to water shortages, which slow the transportation of calcium to the plant, or can be caused by excessive usage of potassium or nitrogen fertilisers."

Wow, excessive usage of K or N fertilizers may resulted in calcium deficiency!

I did an internet search and found an interesting article (65 years ago!) "EFFECT OF THE FORM OF THE AVAILABLE NITROGEN ON THE
CALCIUM DEFICIENCY SYMPTOMS IN THE BEAN PLANT"
http://www.plantphysiol.org/cgi/reprint/16/1/145

"In the absence of calcium much better growth was made with urea than with nitrates. With urea the calcium deficiency symptoms were much delayed, and when they became evident they were very much less severe."

Therefore I assume that nitrate may be a better nitrogen source for the plant, however, calcium supplement would be indispensable to alleviate the calcium deficiency in the plant.

Like to hear more comments on that. Thanks.