1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality." c4 B1 G6 V9 ^4 v( T% t7 U
2. Reduce the use of chemical fertilizer and use organic one instead.
3 L% ~) a$ ?, ]& [- i8 Y& J
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.