Thus application of biochar
must compare with sustainable soil remediation practices such as biodynamic
farming which have advantages in crop productivity too. The use of cow dung,
poultry manure or pig manure during biodynamic farming replenishes soil
organic matter content which binds with heavy metals as well as increase
nitrogen content in the field. Since these methods use by-products of livestock,
the remediation process is economically feasible. Papermill sludge and
water treatment sludge are also low-cost ecofriendly amendments that bring
down soil heavy metals in the soil