1. Excavate the top 4-6 ins layer of dirt and fill back up with new topsoil of good quality.* l; E3 c( ]' U& x! b
2. Reduce the use of chemical fertilizer and use organic one instead.
& u# a/ Q% \" `0 a - m% g4 t% ^4 A( A4 P- y n! \可是我已经铺上了大概3IN 的COMPOST 土,要挖起来就费劲了。不过还要谢谢您的回复。* J8 w4 `: R- E' W/ N
BIGWOOOL 发表于 2010-1-4 23:21
+ j6 F" |* z5 m/ H) V; FI 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.