Table 3 Effects of different levels of N forms and K supply on leaf photosynthetic rate (P_n), stomatal conductance (g_s), intercellular CO₂ concentration (C_i), transpiration rate (T_r), and relative chlorophyll content (SPAD value, n = 6) in wheat plants.

Treatments		P_n (μmol m⁻² s⁻¹)	g_s (mol H₂O m⁻² s⁻¹)	C_i (μmol CO₂ mol⁻¹)	T_r (mmol H₂O m⁻² s⁻¹)	Relative chlorophyll content (SPAD)
AN2	K0.5	16.96 ± 0.23 fgh	0.267 ± 0.005 cd	298 ± 1 b	4.80 ± 0.18 g	50.83 ± 2.51 a
	K5	17.40 ± 0.23 ef	0.282 ± 0.005 c	290 ± 5 bcd	5.02 ± 0.06 fg	50.32 ± 1.29 a
	K15	18.01 ± 0.21 de	0.288 ± 0.010 bc	281 ± 4 de	5.45 ± 0.16 de	49.80 ± 2.07 a
AN10	K0.5	16.03 ± 0.59 h	0.233 ± 0.014 e	319 ± 3 a	4.44 ± 0.22 h	50.42 ± 1.41 a
	K5	16.30 ± 0.17 gh	0.249 ± 0.006 de	312 ± 10 a	4.74 ± 0.31 gh	50.67 ± 3.23 a
	K15	16.75 ± 0.55 fgh	0.255 ± 0.008 de	296 ± 1 bc	5.07 ± 0.06 fg	49.58 ± 4.48 a
NN2	K0.5	17.02 ± 0.54 fg	0.307 ± 0.017 b	288 ± 6 cd	5.28 ± 0.30 ef	45.95 ± 1.91 b
	K5	18.56 ± 0.55 cd	0.336 ± 0.024 a	281 ± 6 de	6.05 ± 0.30 c	44.32 ± 1.15 b
	K15	19.29 ± 0.80 bc	0.347 ± 0.015 a	275 ± 4 ef	6.51 ± 0.19 b	44.27 ± 2.68 b
NN10	K0.5	18.75 ± 0.68 cd	0.333 ± 0.029 a	272 ± 5 f	5.72 ± 0.09 cd	51.06 ± 2.18 a
	K5	19.74 ± 0.82 ab	0.342 ± 0.010 a	267 ± 7 fg	6.53 ± 0.19 b	50.10 ± 1.55 a
	K15	20.30 ± 0.91 a	0.352 ± 0.012 a	259 ± 6 g	7.13 ± 0.13 a	49.75 ± 1.60 a
Significance ( P )
N form (NF)		<0.001	<0.001	<0.001	<0.001	<0.001
N rate (NR)		NS	<0.05	NS	NS	<0.001
K level (K)		<0.001	<0.001	<0.001	<0.001	NS
NF*NR		<0.001	<0.001	<0.001	<0.001	<0.001
NF*K		NS	NS	NS	<0.001	NS
NR*K		NS	NS	NS	NS	NS
NFNRK		NS	NS	NS	NS	NS

Data presented as mean ± standard deviation of three replicates (Mean ± SD, n = 3). Different lowercase letters in the same column indicate significant differences among treatments at P < 0.05 level.

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