CaNO3 is where fertilizer manufacturers that include Ca in their soluble fertilizers get their Ca FROM. It is the only soluble source of Ca they use, so it is unlikely that you will encounter Ca deficiency induced BER while using it, unless it's a culturally induced case. That said, it's continued use w/o balancing the amount of Mg being supplied to the amount of Ca being supplied could easily lead to an antagonistic deficiency of Mg. If you are seeing actual benefit from your applications of this compound, there was something wrong with your fertilizer program from the very beginning. Either you were not supplying enough Ca or not enough N. You can't make plants use more Ca or N by simple virtue of the fact that you add more to the soil solution than plants need, so that they respond is indication that one or both of those elements were in short supply. The plants aren't growing at beyond their genetic potential, just growing at closer to their genetic potential, which they would already have been doing if your fertilizer was providing adequate nutrition.

I'm not a fan of adding elements or compounds to supply 1 or 2 elements to the plant unless they are missing from fertilizers. Ca and Mg are the two that are often necessary to supplement or to use to manipulate within the parameters of their actual presence, media pH, and the ratio between them. All the other elements plants use are better supplied in a fertilizer that provides them in an appropriate ratio and by trying to making sure the pH of the soil solution allows for the uptake of nutrients already present.

I'm not suggesting you change anything if you're happy, but I did want to present a few things others may wish to consider before they follow suit.

Al

Thanks Al!!! That is information I can keep on file for the 2010 season.

DL