Trees 1 to 2 years old, apply one-fourth cup of fertilizer per tree;
Trees 3 to 4 years old, apply one-half cup per tree;
Trees 5 to 10 years old, apply 1 to 2 cups per tree;
Trees more than 10 years old, apply 2 to 3 cups.
You may also use nitrate of soda (16-0-0) but double the rate recommended above. If a soil test calls for phosphorus and potassium, use a 10-10-10 but triple the rate.
On apple trees, last year's growth should be 8 to 10 inches, cherries should have 10 to 12 inches, and peaches should equal 12 to 15 inches of terminal growth. If less than this, apply the higher rate of fertilizer, and if more, apply the lesser amount.
Spread all fertilizer evenly on the ground away from the trunk of the tree and to the outer spread of the branches. Water in the fertilizer with at least 1/4 inch of water if rain does not do the job for you. (Ward Upham)