I have asked many people in the Ag business but none of them really know what type of fertilizer would be best for trees. I have a mixture of oaks, spruce, all types of maples and some fruit and nut trees. For some reason, this last year has been hard on my spruce trees. I did a test for aphids but they are free of that. So I plan to put down some fertilizer, 15 acres, to maybe help them out. I know the ground is not dead as we have ran a soil test and there is still life. Certain spots seem water washed and that is mostly where the spruce trees are.
So I can but Urea (46% Nitriogen) for $850.00 a ton or 13-13-13 for $950.00 a ton. The potash will take about 4 months to breakdown and be usefull so I will not see much benifit from that this year. I am torn. Will the high notrogen in the urea cause the trees to grow and not fill out cause a weak trunk? I do not know what one is a smarter choice....... Anyone?