Nitrogen for Trees

Philipsburg, MT

Hi. I have some young spruces and aspens, and was told they need some nitrogen added to the soil. I purchased some 20% nitrogen pellets online and the directions only said to add 1?16 to 1/8 tsp per gallon of water. Nothing about how much of the nitrogen water should be given to the trees. Can anyone advise? I want them to get enough to be helpful but not too much.

Thank you!

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