Balls...I got end rot on my zucchinis!

I was able to harvest only 2 real good ones. I read I have to add calcium to the garden? What's best since it's pretty much established at this point?

Here's a good article on how to prevent and combat blossom end rot, Cheese http://www.suite101.com/article.cfm/edible_gardening_plus/73178

On another website, it suggests thoroughly spraying the plant with a solution of 1 T. Epsom salt to 1 gallon of water (a calcium solution).

Lee