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Seaweeds have been used for years as organic fertilizer due to their high amount of Growth Promoting Hormones (GPH) and other nutrients required by plants. In this experiment, identification of GPH compounds in Eucheuma cottonii sap has been carried out using HPLC. The results were then compared with those of the commercial seaweed fertilizers (based on secondary data). The results showed that the sap of E. cottonii contained gibberellin i.e. gibberellic acid, GA3 and GA7 with the concentration of 128 and 110 ppm, cytokinin i.e. zeatin and kinetin of 117 and 73 ppm, and auxin i.e. indole acetic acid (IAA) of 160 ppm. In general, the sap of E. cottonii showed a higher amount of GPH than those of some commercial seaweed fertilizers, and it demonstrated a potential use of E. cottonii to be developed as a plant growth stimulant in organic fertilizer. Nevertheless, production of Alkali Treated Cottonii (ATC) using the sap extracted seaweed resulted a poorer quality.

Identifikasi Hormon Pemacu Tumbuh Ekstrak Cairan (SAP) Eucheuma cottonii