1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality.4 w- w2 H3 }% w$ o v/ f0 O8 x
2. Reduce the use of chemical fertilizer and use organic one instead.
' ^9 U# b9 U. `3 K9 ?* q4 [& V9 t# L2 FI 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.