Interactive effects of nitrogen and potassium on photosynthesis and photosynthetic nitrogen allocation of rice leaves

Table 1 Interactive effect of nitrogen and potassium on leaf dry mass, leaf area, chlorophyll content, nitrogen content (N_a) and potassium content (K_a)

Treatments		Leaf dry mass g plant⁻¹	Leaf area cm² plant^− 1	Chlorophyll mg m^− 2	N_a g m^− 2	K_a g m^− 2
N0	K0	3.16 ± 0.18 bC^a	602 ± 36 cB	146.9 ± 1.5 aB	1.14 ± 0.02 aC	1.05 ± 0.05 bA
	K120	4.52 ± 0.11 aC	859 ± 47 bC	125.2 ± 8.9 bB	1.02 ± 0.01 bC	1.10 ± 0.01 bA
	K180	4.86 ± 0.15 aB	942 ± 48 aB	118.1 ± 1.3 bB	1.01 ± 0.03 bC	1.17 ± 0.01 aA
N180	K0	5.04 ± 0.18 bB	1114 ± 65 cA	155.6 ± 6.1 aB	1.34 ± 0.04 aB	0.88 ± 0.02 cB
	K120	5.85 ± 0.17 aB	1297 ± 77 bB	143.6 ± 5.9 abA	1.27 ± 0.03 bB	0.96 ± 0.02 bB
	K180	6.11 ± 0.22 aA	1553 ± 132 aA	140.4 ± 6.4 bA	1.25 ± 0.10 bB	1.06 ± 0.04 aB
N270	K0	8.06 ± 0.21 bA	1220 ± 145 bA	175.8 ± 3.7 aA	1.45 ± 0.05 aA	0.77 ± 0.02 cC
	K120	8.80 ± 0.28 aA	1708 ± 72 aA	144.1 ± 2.8 bA	1.41 ± 0.02 abA	0.91 ± 0.01 bC
	K180	8.69 ± 0.39 abA	1660 ± 97 aA	141.5 ± 13.5 bA	1.36 ± 0.02 bA	0.99 ± 0.02 aC
N		**^b	**	**	**	**
K		**	**	**	**	**
N × K		*^c	**	*	*	*

^a Different small letters were used to show the significant differences between three K rates of the same N rate. Different large letters were used to show the significant differences between three N rates of the same K rate
^b ** means significant difference at P ≤ 0.01
^c * means significant difference at P ≤ 0.05, ns means no significant difference

ISSN: 1471-2229