1. Abd-Alla MH, Yan F, Schubert S (1999) Effect of sewage sludge application on nodulation, nitrogen fixation, and plant growth of faba bean, soybean and lupin. Angew Bot 73:69–75
2. Ahmed D, Slima D (2018) Heavy metal accumulation by Corchorus olitorius L. irrigated with wastewater. Environ Sci Pollut Res 25:14996–15005
3. Allen S (1989) Chemical analysis of ecological materials. Blackwell Scientific Publications, London, p 368
4. Anonymous (1987) Asir: heritage and civilization. Obeikan Company for Printing and Publishing, Riyadh
5. Anonymous (2019) Asir agricultural terraces: artificialization of nature and basket of safe food. J Saudi Reg 5:1–2