Amarakoonge, K.Bambaranda, B.V.A.S.M.Jayamanne, S.C.Jayarathne, K.P.N.N.S.2022-01-242022-01-2420159789550481088http://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/8215/01-AQT-Determination%20of%20a%20suitable%20growing%20medium%20and%20a%20commercial%20.pdf?sequence=1&isAllowed=yAquatic Plant varieties have unique morphology and habitats as commercially important aquatic plants. Dissanayakel., 2007). The most popular ornamental aquarium plants genera are Anubias, Cryptocoryne, Echinodorous, Aponogeton, Hygrophyla, Bacopa, Hydrilla, Cabomba, Myriophyllum, Aponogeton and Echinodorous have important characteristics as aquarium plants in Sri Lanka. Echinodorus species have attractive green to mid green submerged leaves arranged in a rosette with beautiful, white flowers occurring in an inflorescence (Muhlberg, 1982). Aquatic plants play a significant role in the freshwater ecosystems worldwide. With time ecosystem may collapse without aquatic plants due to wild collection. Therefore growing plants is solution for that. An aquatic plant growing medium was essential for that. The growing mediums contain sand, silt and clay proportion according to the ratio of the medium. Four different ratios were used as treatments (T). T1- Boggy soil: Bricks particles T2- 3:1, Boggy soil 3: Sand 1, T3-Boggy soil: Top soil -3:1, T4-Top soil were treatments. Growing medium should balance the aeration and water for maximum root growth and physically support for the plant. Practical size of the growing medium should be with adequate pore spaces between the particles (Bilderbackl., 2005) Nutrition is a major factor for the plant growth. Therefore nutrient should be supplied in optimum level at the correct time as fertilizers. Methodology The present study was carried out to investigate the effect of growing medium and fertilizer for the growth of Echinodorus parviflorus‘Tropica’ National Aquaculture Development Authority (NAQDA) Ornamental Fish Breeding and Training center in Rambadagalle Sri Lanka. Experiment one was conducted to find out a suitable nursery medium for the E.parviflorus ‘Tropica’ plant. Boggy soil, brick particles, sand and top soil were used. Using those growing substrate four types of media used as treatments (T), T1- Boggy soil: Bricks particles T2- 3:1, Boggy soil 3: Sand 1, T3-Boggy soil: Top soil -3:1, T4-Top soil were treatments. Experiment two four fertilizer mixture used as four treatment of fertilizer, T1-N: P: K -4:2:1, T2- N: P: K -5:2:3,T3- N: P: K -3:1:1and T4- N: P: K - 20:20:20 were used during this study. Uniform Echinodorus parviflorus ‘Tropica’ about 4.5 cm -6.5 cm heights, same age plants were selected for the experiment. Old and rotted leaves were removed; leaving 5- 6 laves to remain. Old and rotted roots also were trimmed, leaving the only healthy roots. Initial weights between 0.5 g - 1.5 g of plants were selected.Experiment one and two results were analyzed by using Minitab 16 computer package and significant differences between treatments were identified using Analysis Of Variance (ANOVA) produce at 5% probability level. In experiment one T4-Top soil and experiment two T4- N: P: K -20:20:20 were used as control of the both experiments. Results According to experiment one, Boggy soil 3: sand 1(T2) growing medium was most suitable growing medium among other used media for the E.parviflorus ‘Tropica’.In the experiment one, there was significant difference (P< 0.05) among four treatments regarding increment of plant height, weight, dry weight and root length. As indicated Table1, the maximum growth was observed in T2.enAnimal SciencesAquatic ResourcesExport AgricultureAgriculturePlantOther