Application of calcium phosphate crystallization pellet recovering from fluidized-bed crystallizer on planting Ipomoea aquatica

• Main Authors: Yen-Kai Liao, 廖彥凱
• Other Authors: Chun-Sheng Wu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/39329178731592874439

碩士 === 立德大學 === 資源環境研究所 === 97 === ABSTRACT In this study, combination of different proportions of calcium phosphate crystallization pellet (CPCP), limestone sand, and quartz sand with red soil and general soil were used to plant Ipomoea aquatica (water spinach). The values of pH, calcium content, phosphorus content were analyzed; growth height and robust index of Ipomoea aquatica were measured; the effect of soil contents on the growing condition of Ipomoea aquatica was investigated. In addition, the effect of CPCP on improving soil quality was conducted, and feasibility of recovering CPCP was also assessed. The operation condition for cultivating water spinach were maintained in an average temperature of 23 ℃, an average relative humidity of 80 %, and an average soil moisture content of 15 % (m/m). After growing to 2-3 cm height, the water spinach was transferred to different pot and then began the growth experiment. During the course of 720 hours, soil samples were analyzed, and growth height and stem diameter of water spinach were measured. Judging by the robust index, the best conditions for cultivating Ipomoea aquatica were a combination 300 g CPCP with 200 g red soil or that of 100 g CPCP with 400 g general soil. According to the experimental results, the optimal environments of pH 7.1-7.3, 7.8-8.3 mg/l calcium, and 5.0-8.1 mg/l phosphorus resulting in growth height of 22.7-23.6 cm and robust index of 5.8-7.7 were found. Consequently, the red soil’s over-acidification problem can be improved with addition of CPCP. A more suitable environment was created and the growing conditions of Ipomoea aquatica were enhanced then. Keywords: calcium phosphate crystallization pellet (CPCP), robust index, soil environment, red soil, Ipomoea aquatica