Hello,

I did a leaf analysis on one of my trees, a honey crisp, and it showed a need for Nitrogen, Mag, and Zinc. I addressed the Mag. with epson salts. The nitrogen is low and I know it and don't plan on adding much....

But, how do you add Zinc to your soil? need to add it to about 50 trees.

dan or
Trees are located in Umatilla, OR

Nitrogen can be added by supplying urea. Perhaps you can think of a convenient way to do this.

Zinc is a trace mineral. Some people assure trace minerals by making sure that their full soil food web is active. Mushrooms can also set up a wide ranging mycelium that gathers trace minerals from afar.
John S
PDX OR

Some of us are at a disadvantage there.

True, but Paul Wheaton has a whole podcast and email about women peeing outdoors on permies. com.

Kind of amusing. In a way.
John S
PDX OR

I'm in the process of adding the zinc a soil test indicated I needed. I bought zinc sulfate, and am sprinkling it on the ground around the trees.

You could try a zinc foliar spray.
Check out this link for addressing specific deficiencies in fruit trees:
http://www.tfrec.wsu.edu/horticulture/nutspray.html
Chris