Physiological responses of Brassica napus to fulvic acid under water stress: Chlorophyll a fluorescence and antioxidant enzyme activity
Ramin Lotfi, Mohammad Pessarakli, Puriya Gharavi-Kouchebagh, Hossein Khoshvaghti
The Crop Journal . 2015, (5): 434 -439 .  DOI: 10.1016/j.cj.2015.05.006