1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality. 5 L9 j, X+ M; f1 q) M8 N0 T4 ~4 I2. Reduce the use of chemical fertilizer and use organic one instead.
$ }: C5 P/ ]/ w" b0 P
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.