Bio-decomposer of seaweed composting

Abstract

The potential for seaweed in agriculture has not been utilized optimally. The existence of growth-stimulating activity from the seaweed-based formulation can be used as a biostimulant to increase crop productivity. The research objective was to find bio-decomposer isolates and formulas for composting seaweed. The research was conducted at the Biology Laboratory of ISRI at April-September 2018. The research was started from selection of 191 isolates to get the promising isolates as bacterial consortium (BC) inoculation. The second activity was to evaluate the effect of formulation of BC inoculation. The completely randomized design with 6 replications was applied, whereas the treatments tested were inoculation seaweed without BC, inoculation seaweed by BC1, BC2, BC3, BC4. Parameters measured were CO2 evolution rate, organic C, CN ratio, humic acid, and Seaweed dry weight of seaweed. The results showed that the BC formula consisted of GK5.7, SW2.1, and NP2.4 isolates were the best formula for decomposing Sargassum. The BC formula consisted of NP1.2, SW2.4, and GK 6.4 isolates were the best formula for decomposing Gracillaria. Inoculating of Bacterial Consorsium to the Sargassum and Gracillaria seaweed increase the CO2 evolution rate, humic acid content, and decrease the substrate dryweight and C/N.