Cassava peels, poultry droppings, pig manure are common wastes with resourceful fertilizer value but often indiscriminately discarded, thereby constituting environmental pollution. Earthworms often neglected helps to convert these wastes into valuable resources containing plant nutrients and organic matter (OM) which are important for maintaining soil productivity. A potted experiment was conducted using four different compost materials and a control and ten [10] pieces of earthworm was introduced to each pot, the treatments were replicated four times. The compost materials were; Cassava peel compost (CP); pig manure + cassava peel compost (GC), poultry manure + cassava peel compost (PC); pig manure + poultry manure + cassava peel compost (PGC) and polluted soil (DO). The essence was to evaluate the efficiency of cassava peel compost and earthworm cast on the rheological, physical and biological properties of a polluted soil. The result obtained showed that the treatments enhanced the plastic limit and liquid limit of the polluted soil and the liquid limit of GC and PC were statistically similar. The pots amended with GC enhanced the shrinkage limit of the polluted soil by 3.60% followed by CP with 7.40% but that of control (DO) was very high which is not ideal. The addition of earthworm and compost application fail to significantly (P<0.05) improve the mean weight diameter and dispersal ratio of the soil, but significantly reduced the aggregated silt + clay content of the polluted soil. The microbial biomass result showed that the microbial biomass of all the treated pots were significantly increased relative to the polluted soil pots. The result of the study also revealed that the GC compost performed competitively better than any other treatments in most of the parameters assessed in this trial. The findings from the study, then suggest that compost inoculated with earthworm and used as soil amendment will help to remediate and improve an impaired soil like oil polluted soil as the amendments have enhanced the physical and biological parameters of the polluted soil.
Cassava Peel, Compost, Rheology, Polluted Soil, Soil Properties
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