1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality. 9 Y5 H7 m1 z- n- P, \2. Reduce the use of chemical fertilizer and use organic one instead.
" R0 h, }, h' _7 F2 Z* G8 [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.