Application of different foliar iron fertilizers for improving the photosynthesis and tuber quality of potato (Solanum tuberosum L.) and enhancing iron biofortification

Chemical and Biological Technologies in Agriculture

Table 2 Fv/Fm, Fv'/Fm', Φ_PSII, Y_(NO) of potato as affected by different iron fertilizer treatments

	Treatment	Fv/Fm	Fv'/Fm'	Φ_PSII	Y_(NO)
CY-1	CK	0.76 ± 0.0015d	0.69 ± 0.0085a	0.57 ± 0.0224a	0.26 ± 0.0138a
	T1	0.77 ± 0.0036c	0.68 ± 0.0111a	0.55 ± 0.0118a	0.26 ± 0.0028a
	T2	0.78 ± 0.0018bc	0.70 ± 0.0089a	0.57 ± 0.0137a	0.24 ± 0.0018a
	T3	0.80 ± 0.0001b	0.74 ± 0.0086a	0.64 ± 0.0103a	0.23 ± 0.0026a
	T4	0.78 ± 0.0001bc	0.70 ± 0.0192a	0.56 ± 0.0266a	0.26 ± 0.0032a
	T5	0.81 ± 0.0014a	0.75 ± 0.0050a	0.64 ± 0.0043a	0.22 ± 0.0042a
CY-2	CK	0.75 ± 0.0049e	0.66 ± 0.0495a	0.43 ± 0.0851c	0.32 ± 0.0103a
	T1	0.76 ± 0.0018de	0.69 ± 0.0113a	0.50 ± 0.0118bc	0.30 ± 0.0052ab
	T2	0.78 ± 0.0043c	0.71 ± 0.0207a	0.57 ± 0.0556abc	0.25 ± 0.0317b
	T3	0.80 ± 0.0018b	0.74 ± 0.0022a	0.68 ± 0.0184a	0.19 ± 0.0122c
	T4	0.78 ± 0.0019 cd	0.71 ± 0.0183a	0.59 ± 0.0242abc	0.24 ± 0.0054bc
	T5	0.82 ± 0.0027a	0.75 ± 0.0036a	0.65 ± 0.0052ab	0.19 ± 0.0009c

Data are mean ± standard error of the three replicates. Different lowercase letters in the same column indicate significant differences among treatments (P < 0.05). CK-No iron fertilizer, T1-Fe₂(SO₄)₃ fertilizer, T2-FeSO₄·7H₂O fertilizer, T3-CA/Fe₂(SO₄)₃ fertilizer, T4-CA/FeSO₄·7H₂O fertilizer, T5- (EDTA-Fe·Na) fertilizer. CY-1 (2020), CY-2 (2021)