“…Studies have shown that moderate foliar application of fulvic acid can improve rice growth, yield, and quality (Goutam et al, 2018;Bama, 2009;Tao et al, 2006). In addition, humic acid can promote the uptake of nutrients (e.g., nitrogen, phosphorus, potassium, and magnesium) (Hasegawa and Yazaki, 1988; Ehsan et al, 2015;Khamene et al, 2014;Ghorbani et al, 2014) and increase leaf chlorophyll content and net photosynthesis rate (Lot et al, 2018;Fan et al, 2014;Bi et al, 2008), thereby further enhancing rice growth.…”