1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality.# n3 l. d1 k+ z3 V) Z
2. Reduce the use of chemical fertilizer and use organic one instead.
4 G; m- E7 l5 |0 ?7 uI should tell a bobcat is required if you wanna do the whole front/back yard OR just spot-excavation (dig a bigger and deeper than normal hole, dump the old dirt and back fill w/ good topsoil when you want to plant a new tree) if you gonna do the job yourself.