Abstract
An important factor in the cultivation of <i>Gracilaria verrucosa</i> seaweed in extensive polyculture ponds is (i) the determination of the right density of polyculture commodities (ii) the provision of fertilizers as nutrients to support the life of seaweed and (iii) maintenance of the pond soil as a reservoir of nutrients and to maintain the stability of the pond during the cultivation process. These important factors are indicators of success in polyculture activities of extensive ponds in producing optimal quality agar rendement, viscosity, and gel strength. This research was conducted at ponds using a Completely Randomized Design (CRD) of 3 treatments and 3 replicates; treatment A (best density &#43; no vermicompost fertilizer &#43; pond soil substrate), B (best density &#43; vermicompost fertilizer &#43; pond soil substrate), and C (best density &#43; vermicompost fertilizer &#43; no pond soil substrate). The treatments in this study had a significant effect on growth, number of cells, carbon content, and quality of agar viscosity of seaweed <i>G. verrucosa</i> in extensive ponds with polyculture systems.
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