Table 2.

Two- way analysis of variance of different water salinity levels and N application rates for maximum leaf area index (LAI_max), leaf water potential (LWP), photosynthesis rate (A_n), and leaf transpiration rate (T_r), stomatal conductance (g_s), leaf transpiration efficiency (A_n/T_r), and intrinsic water use efficiency (A_n/g_s), mean root length density (RLD), root weight density (RWD), and specific root length density (SRL)

Variable				N application rate (N)	Water salinity (S)	N×S
df				3	2	6
Trait
LAI max		Mean squares		18.98	2.18	0.32
		F-value		37.96**	4.36**	0.64 ns
LWP		Mean squares		0.12	0.21	0.035
		F-value		5.06*	8.79**	1.47 ns
An		Mean squares		32.88	14.5	0.79
		F-value		75.33**	33.22**	1.82 ns
Tr		Mean squares		14.98	2.15	0.20
		F-value		43.36**	6.22**	0.58 ns
gs		Mean squares		0.03	0.005	0.001
		F-value		205.21**	31.55**	7.13**
An/Tr		Mean squares		0.034	0.12	0.05
		F-value		1.80 ns	6.42 **	2.93 *
An/gs		Mean squares		116.65**	60.78	229.9
		F-value		18.67**	1.02 ns	3.84*
RLD		Mean squares		4.76	8.32	0.43
		F-value		39.77**	69.44**	3.61**
RWD		Mean squares		3.60	1.64	0.23
		F-value		64.78**	29.60**	4.21**
SRL		Mean squares		0.38	0.55	0.45
		F-value		4.54*	6.57**	5.36**

^ns not significant 

^**Significant at the 0.01 probability level

^*Significant at the 0.05 probability level