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Vermistabilization of seaweeds using an indigenous earthworm species, Perionyx excavatus (Perrier)

Author:
Ananthavalli, Ramachandran, Ramadas, Venkatasamy, John Paul, James Arockia, Karunai Selvi, Balan, Karmegam, Natchimuthu
Source:
Ecological engineering 2019 v.130 pp. 23-31
ISSN:
0925-8574
Subject:
Gracilaria, Perionyx excavatus, Turbinaria ornata, Ulva, carbon nitrogen ratio, coasts, cow manure, earthworms, electrical conductivity, laboratory experimentation, macroalgae, organic carbon, physicochemical properties, vermicomposting, vermicomposts, India
Abstract:
The seaweeds, Gracilaria edulis, Turbinaria ornata and Ulva reticulata collected from Mandapam East Coast region of Tamil Nadu, India has been subjected to vermicomposting in combination with cowdung (CD) in 1:1 combination for 60 days under laboratory conditions. The percentage decomposition was ranged between 83.70 and 87.00 in the vermicompost of seaweed + CD combinations while it was 30.71 and 35.12% in worm-unworked compost where the decomposition rate of substrates with earthworms is significantly (P < 0.05) higher than the substrates without earthworms after 60 days. The physico-chemical characteristics of the vermicompost showed increased levels of electrical conductivity, NPK, while organic carbon, C:N ratio and organic matter content showed reduction in all seaweed + CD substrates. A higher amount of NPK of 1.38, 0.69 and 2.41% respectively in the vermicompost of Turbinaria ornata + CD was recorded with the respective percentage increase of 50.00, 68.29, and 34.64 over compost, and the values were significantly higher (P < 0.05) than in the initial substrate as well as the worm-unworked compost of Turbinaria ornata + CD. The activity of earthworms during vermicomposting of seaweed substrates significantly increased the total microbial population.
Agid:
6304010