1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality.2 ]# _" U; k* ?8 T/ Y
2. Reduce the use of chemical fertilizer and use organic one instead.
1 }6 r) j# i2 ~I 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.