Table 1: Chemical composition of the organic materials*.

SourcepHE.C.O.C.C/NPKCaMgBCuFeMnZn
dS m−1g kg−1g kg−1Mg kg−1

Sugar cane filter cake7.50.9263.71210.32.316.23.721605900557141
Peat5.50.2163.1240.81.41.71.7164563004736

E.C.: electrical conductivity; O.C.: organic carbon.
*Total elements concentration obtained by extraction with a mix of nitric and perchloric acids [17], results presented are the average of six replicates.