Combination of Vermicompost Fertilizer, Carbon, Nitrogen and Phosphorus on Cell Characteristics, Growth and Quality of Agar Seaweed Gracilaria verrucosa

摘要

Seaweed is one of the marine and fishery commodities which encounter many problems in spurringgrowth and obtain high quality of agar, especially in Takalar District South Sulawesi Province, Indonesia.The combined use of vermicompost organic fertilizer, carbon, nitrogen and phosphorus are a sourceof much-needed nutrients by the seaweed to expand the network of cells that affect the growth andquality of agar. The purpose of this study was to see the influence of the combination of vermicompostfertilizer, carbon, nitrogen and phosphorus on the characteristics of the cells, the growth and thequality of agar seaweed G. verrucosa. This study was conducted for 42 days. The treatment ratio ofcarbon% : nitrogen% : phosphorus% are 93:6:1, 92:7:1, 91:8:1, 90:9:1, 89:9:2 and 88:10:2. Treatmentratio of fertilizer was best obtained at treatment 91:8:1, the cell number 39-104mm -2 , cell size from 25.189 to 400.213 ?m, cell shape oval and cell wall thickness, weight biomass 0.65to 2.14 g, the daily specific growth from 2.29 to 7.99%, thallus length from 2.5 to 3.8 cm, quality of agarfrom 9.98 to 26.52%, quality of agar viscosity of 43-90 cps, quality of agar gel strength of 49.0 to 80.4g/cm 2 . The range of water quality during the study was 25-26°C for the temperature, water salinitywas 25 ppt, pH 7.50 to 7.87, carbon 734.51 to 4754.12 ppm, nitrogen from 14.91 to 98.91 ppm, andphosphorus of water from 19.84 to 38.39 ppm.