1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality.2 M/ I4 K; p) H. x/ q: J! u; B
2. Reduce the use of chemical fertilizer and use organic one instead.
/ Q. y2 ~8 y' s# F4 R( `, L! TI 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.