1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality. K6 Q, R3 I# U+ G. V; ?1 K2 [
2. Reduce the use of chemical fertilizer and use organic one instead.
( g- E2 V: b' [8 @3 a- }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.