1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality. % M6 O- q- k/ W1 r$ _2. Reduce the use of chemical fertilizer and use organic one instead.
% t7 G) p5 s2 a! x4 vI 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.