Posted by Ray Tractor on April 22, 2017 at 18:49:47 from (184.53.33.97):
In Reply to: Urea 46-0-0 posted by rrc300 u on April 22, 2017 at 17:49:38:
I can show you how I would calculate how much to use. Lets say trees are in rows 10 ft wide. 43560 sq ft/10 ft equals 4356 ft of row to an acre. if trees are say every 8 ft in the row, then 544 trees to the acre. Lets say you want to apply 50 lb actual N/acre(about what I would use at one time for blackberry bushes, but maybe repeated for 100 lb for the year)so that would require 50/.46 = 109 lb urea per acre. So that is 109/544 = .2 lb per tree. That would be probably a half cup per tree, or maybe one handful.
But you need to find how much N is really recommended for Christmas trees, as I am just speculating. Also, ammonium sulfate would be good if the pH is too alkaline, because it supplies sulfur and it is an acidic fertilizer. Sometimes yellow is a sulfur deficiency such as in blueberries. Also, Nitrogen and sulfur work together and compliment each other since both are needed for protein production in the plant.
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