Ru Dongyun, Liu Jikai, Hu Zhen, Zou Yina, Jiang Liping, Cheng Xiaodian, Lv Zhenting
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
Environmental Management Committee Office of Dongping Lake and Nansi Lake, Jining, 272000, China.
Environ Sci Pollut Res Int. 2017 Jul;24(19):16328-16335. doi: 10.1007/s11356-017-9273-1. Epub 2017 May 25.
Aquaponics is one of the "zero waste" industry in the twenty-first century, and is considered to be one of the major trends for the future development of agriculture. However, the low nitrogen utilization efficiency (NUE) restricted its widely application. To date, many attempts have been conducted to improve its NUE. In the present study, effect of micro- and macro-nutrient addition on performance of tilapia-pak choi aquaponics was investigated. Results showed that the addition of micro- and macro-nutrients improved the growth of plant directly and facilitated fish physiology indirectly, which subsequently increased NUE of aquaponics from 40.42 to 50.64%. In addition, remarkable lower total phosphorus concentration was obtained in aquaponics with micro- and macro-nutrient addition, which was attributed to the formation of struvite. Most of the added micro-nutrients were enriched in plant root, while macro-nutrients mainly existed in water. Moreover, no enrichment of micro- and macro-nutrients in aquaponic products (i.e., fish and plant leaves) was observed, indicating that it had no influence on food safety. The findings here reported manifest that appropriate addition of micro- and macro-nutrients to aquaponics is necessary, and would improve its economic feasibility.
鱼菜共生是21世纪的“零浪费”产业之一，被认为是未来农业发展的主要趋势之一。然而，低氮利用效率限制了其广泛应用。迄今为止，人们已经进行了许多尝试来提高其氮利用效率。在本研究中，研究了添加微量和大量营养素对罗非鱼-小白菜鱼菜共生系统性能的影响。结果表明，添加微量和大量营养素直接促进了植物生长，间接促进了鱼类生理，随后鱼菜共生系统的氮利用效率从40.42%提高到了50.64%。此外，添加微量和大量营养素的鱼菜共生系统中总磷浓度显著降低，这归因于鸟粪石的形成。添加的大多数微量营养素富集在植物根部，而大量营养素主要存在于水中。此外，未观察到鱼菜共生产品（即鱼和植物叶片）中微量和大量营养素的富集，表明其对食品安全没有影响。这里报道的研究结果表明，向鱼菜共生系统中适当添加微量和大量营养素是必要的，这将提高其经济可行性。
