IJEP 41(6): 613-620 : Vol. 41 Issue. 6 (June 2021)
1. Universitas Muhammadiyah Gresik, Aquaculture Study Programme, Faculty of Agriculture, Gresik, Indonesia
2. Universitas Halu Oleo Kendari, Faculty of Forestry and Environmental Sciences, Kendari, Indonesia
Abstract
The development of profitable Gracilaria verrucosa seaweed cultivation is possible because of the high market demand for gelatine (agarose). These advantages make Gracilaria verrucosa cultivation attractive but problems of decreasing productivity are encountered, due to the use of chemical/inorganic fertilizers. In this study, we investigated the use of vermicompost fertilizer, from different organic wastes feed waste, reed waste (Imperata) and banana stem waste and their effect on the productivity of Gracilaria verrucosa seaweed. The data were analysed using ANOVA and the Tukey test. The results showed that the lengths of the short and long axes of the seaweed cells were 165.0-227.3 mm and 170.3-253.7 mm, respectively. The daily growth rate was 0.95-1.61% per day. The agar yield quality on day 0 was 12.4-16.0% and on day 42, it was 24.6-30.6%. The nitrogen content of Gracilaria verrucosa seaweed on day 0 was 1.50-1.86% and 2.93-3.60% on day 42 while the phosphorus content on day 0 was 0.13-0.22% and 0.41-0.61% on day 42. Treated banana stem waste is the best waste to increase the growth and quality of seaweed.
Keywords
Gracilaria verrucosa, Mineral content, Growth, Cell size, Vermicompost
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