Fig. 1

Net photosynthetic rate, SPAD value, and antioxidant enzyme activity and soluble protein content of ‘Wufengyou 286’ under heavy nitrogen application before and after drought.aPn,bSPAD value,cSOD activity,dPOD activity,eCAT activity andfSoluble protein content. Values are averages ± SD (n = 3), and statistically significant differences are indicated by lowercase letters (p < 0.05)