Table 1: Chemical properties of the soil used for the experiment.

Biosolid treatment pHTotal concentration (mg kg−1)

135 Mg ha−16.91124318888120559
1,080 Mg ha−16.1265964782153961466

Obtained at Moreno Field Station of the University of California, Riverside, CA. From 1976 through 1981, composted biosolids were applied at dry weight rates of 0 (control), 22.5, and 180 Mg ha−1 yr−1, respectively.
1 : 1 w/v ratio.