TABLE 5.

Pearson’s correlation coefficients matrix (r) between photosynthetic indices, RUE, RWC, RDW, and P-uptake in grains (PUG) of maize and wheat.

	PUG	PAR@FL	PR	TR	TE	SC	RDW	PHI	ICO2–C	SLI	PCPULA	RUE	RWC	GY
In maize
PUG	1.000	0.708	0.798	0.700	0.711	0.709	0.691	0.209	0.292	−0.318	0.704	0.680	0.799	0.856
PAR@FL	0.708	1.000	0.769	0.788	0.570	0.782	0.712	−0.224	0.375	−0.378	0.706	0.618	0.802	0.826
PR	0.798	0.769	1.000	0.871	0.897	0.870	0.833	−0.268	0.352	−0.361	0.800	0.860	0.896	0.860
TR	0.700	0.788	0.871	1.000	0.565	0.913	0.807	−0.339	0.303	−0.306	0.740	0.722	0.871	0.782
TE	0.711	0.570	0.897	0.565	1.000	0.632	0.675	−0.146	0.303	−0.316	0.676	0.794	0.716	0.731
SC	0.709	0.782	0.870	0.913	0.632	1.000	0.778	−0.310	0.483	−0.488	0.755	0.761	0.863	0.798
RDW	0.691	0.712	0.833	0.807	0.675	0.778	1.000	−0.357	0.272	−0.285	0.692	0.728	0.702	0.832
PHI	0.209	−0.224	−0.268	−0.339	−0.146	−0.310	−0.357	1.000	0.057	−0.086	−0.308	−0.170	−0.180	−0.085
ICO2-C	0.292	0.375	0.352	0.303	0.303	0.483	0.272	0.057	1.000	−0.997	0.119	0.455	0.438	0.439
SLI	−0.318	−0.378	−0.361	−0.306	−0.316	−0.488	−0.285	−0.086	−0.997	1.000	−0.114	−0.475	−0.441	−0.454
PCPULA	0.704	0.706	0.800	0.740	0.676	0.755	0.692	−0.308	0.119	−0.114	1.000	0.521	0.716	0.654
RUE	0.680	0.618	0.860	0.722	0.794	0.761	0.728	−0.170	0.455	−0.475	0.521	1.000	0.803	0.751
RWC	0.799	0.802	0.896	0.871	0.716	0.863	0.702	−0.180	0.438	−0.441	0.716	0.803	1.000	0.842
GY	0.856	0.826	0.860	0.782	0.731	0.798	0.832	−0.085	0.439	−0.454	0.654	0.751	0.842	1.000
In wheat
PUG	1.000	0.783	0.919	0.802	0.816	0.901	0.729	0.406	0.343	−0.358	0.801	0.448	0.881	0.930
PAR@FL	0.783	1.000	0.814	0.728	0.715	0.824	0.738	0.153	0.469	−0.483	0.685	0.457	0.837	0.836
PR	0.919	0.814	1.000	0.862	0.918	0.884	0.780	0.257	0.416	−0.430	0.878	0.477	0.893	0.898
TR	0.802	0.728	0.862	1.000	0.599	0.833	0.650	0.318	0.682	−0.689	0.633	0.647	0.823	0.832
TE	0.816	0.715	0.918	0.599	1.000	0.728	0.757	0.163	0.118	−0.132	0.894	0.252	0.762	0.765
SC	0.901	0.824	0.884	0.833	0.728	1.000	0.587	0.348	0.482	−0.486	0.801	0.567	0.830	0.868
RDW	0.729	0.738	0.780	0.650	0.757	0.587	1.000	0.208	0.265	−0.283	0.642	0.330	0.749	0.774
PHI	0.406	0.153	0.257	0.318	0.163	0.348	0.208	1.000	−0.047	0.057	0.148	0.078	0.250	0.409
ICO2-C	0.343	0.469	0.416	0.682	0.118	0.482	0.265	−0.047	1.000	−0.998	0.193	0.844	0.614	0.507
SLI	−0.358	−0.483	−0.430	−0.689	−0.132	−0.486	−0.283	0.057	−0.998	1.000	−0.206	−0.831	−0.629	−0.519
PCPULA	0.801	0.685	0.878	0.633	0.894	0.801	0.642	0.148	0.193	−0.206	1.000	0.351	0.718	0.753
RUE	0.448	0.457	0.477	0.647	0.252	0.567	0.330	0.078	0.844	−0.831	0.351	1.000	0.653	0.555
RWC	0.881	0.837	0.893	0.823	0.762	0.830	0.749	0.250	0.614	−0.629	0.718	0.653	1.000	0.925
GY	0.930	0.836	0.898	0.832	0.765	0.868	0.774	0.409	0.507	−0.519	0.753	0.555	0.925	1.000

Boldfaced italics and boldfaced values indicate that correlation is positive and highly significant at p < 0.01% and p < 0.05% level of probability (2-tailed); the color assigned to a point in the heat map grid indicates the strength of a correlation between the soil parameters, and r-values correspond directly to the color codes ranging from green to yellow and red, respectively.