[Retracted] Effects of Different Soil Modifiers on Salt Improvement and Distribution, Crop Growth of the Gully Land Consolidation on Loess Plateau

Table 4

The effects of different soil modifiers on leaf photosynthetic characteristics.

Year	2019				2020
Plot	Pn/(μmol CO2/(m^2·s))	Gs/(μmol/(m^2·s))	Ci/(μL/L)	Tr/(mmol H2O/(m^2·s))	Pn/(μmol CO2/(m^2·s))	Gs/(μmol/(m^2·s))	Ci/(μL/L)	Tr/(mmol H2O/(m^2·s))
CK	^e	^c	^a	^d	^e	^c	^a	^d
MS	^d	^b	0^a	^c	^d	^b	^a	^c
YK	^d	^b	^b	^b	^d	^b	^b	^c
HA	^c	^b	^b	^b	^c	^b	^b	^b
HK	^b	^a	^c	^a	^b	^a	^c	^a
NB	^a	^a	^d	^a	^b	^a	^d	^a

Note: Data in the table are . Different letters in the same column represent significant differences between different treatments at the 0.05 level (Duncan’s method). indicates that there is a very significant correlation between experimental factors and results ().