UNESCO Chair in Hydrological Changes and Water Resources Management, RWTH Aachen University, Aachen, Germany.
Center for Applied Research on the Environment and Sustainability (CARES), School of Science and Engineering, The American University in Cairo, AUC Avenue, P.O. Box 74, New Cairo, 11835, Egypt.
Sci Rep. 2022 Jun 30;12(1):11093. doi: 10.1038/s41598-022-15291-7.
This study investigated the utilization of fish effluents as irrigation water and nutrient sources to close the crop yield gap and increase Swiss chard productivity in a closed-loop sandponics system. The experiment was operated using desalinated water from a Reverse Osmosis plant. The study followed a completely randomized design with four variants, i.e., an aquaponic system (T1) and three sandponics systems; October (T2), Benu Suef (T3) and Fayoum (T4). Results indicated that T2 and T4 significantly recorded the highest plant heights in all cuts. The number of leaves per plant decreased with the increase in cut number. Leaf area and chlorophyll was significantly different between the treatments. T1 significantly had low biomass yields in cuts one and two, almost 40% less than T3 and T4. The various systems efficiently minimized water consumption ranging from 1.5 to 1.96 L/m/day. The crop protein content ranged from 11.84 to 18.72 mg/100 g dry weight. Mineral composition in cut one was significantly higher compared to cuts two and three. The study recommends a novel technique for increasing crop production using fish effluents under sandponics systems while increasing water and fertilizer efficiency to close the crop yield gap.
本研究探讨了利用鱼类养殖废水作为灌溉用水和养分来源，以在封闭沙培系统中缩小作物产量差距并提高瑞士甜菜的生产力。该实验使用反渗透工厂的脱盐水进行操作。该研究采用完全随机设计，有四个变体，即水产养殖系统（T1）和三个沙培系统；十月（T2）、贝努苏夫（T3）和法尤姆（T4）。结果表明，T2 和 T4 在所有切割中均显著记录了最高的植物高度。随着切割次数的增加，每株植物的叶片数量减少。叶片面积和叶绿素在处理之间有显著差异。T1 在第一和第二切割中的生物量产量明显较低，比 T3 和 T4 低近 40%。各种系统有效地将用水量最小化，范围从 1.5 到 1.96 L/m/天。作物蛋白质含量在 11.84 到 18.72 毫克/100 克干重之间变化。与第二和第三切割相比，第一切割的矿物组成明显更高。本研究建议在沙培系统中利用鱼类养殖废水增加作物产量的新技术，同时提高水和肥料效率以缩小作物产量差距。
