Determining the Impact of the AM-Mycorrhizosphere on “Dwarf” Sunflower Zn Uptake and Soil-Zn Bioavailability

Table 5

Regression models for soil-pH as a function of soil-Zn treatment.

Parameter	Compartment	Analysis	Treatment	𝑓(𝑥)	𝐹	𝑟^2	𝑑𝑓	𝑃
Soil-pH	Peripheral	Pre-Experimental	Unseeded	−0.002𝑥+6.31	65.5	0.82	1,14	<10^−3
		Post-Experimental	Unseeded	(3.8^𝑒−6)𝑥^2−(2.8^𝑒−6)𝑥+5.78	205.1	0.97	2,13	<10^−3
			Hyphosphere	(3.7^𝑒−6)𝑥^2−(2.6^𝑒−6)𝑥+5.71	205.1	0.95	2,13	<10^−3
			Mycorrhizosphere	(2.8^𝑒−6)𝑥^2−0.0021𝑥+5.63	76.5	0.92	2,13	<10^−3
			Rhizosphere	(1.9^𝑒−6)𝑥^2−(1.6^𝑒−6)𝑥+5.49	87.9	0.93	2,13	<10^−3
	Central	Pre-Experimental	Unseeded	(1.0^𝑒−4)𝑥+6.34	1.72	0.11	1,14	.21
		Post-Experimental	Unseeded	(1.0^𝑒−4)𝑥+5.78	1.65	0.10	1,14	.25
			Hyphosphere	(3.7^𝑒−5)𝑥+5.59	0.30	0.02	1,14	.59
			Mycorrhizosphere	(3.2^𝑒−5)𝑥+5.59	0.24	0.02	1,14	.64
			Rhizosphere	(2.8^𝑒−5)𝑥+5.57	0.15	0.01	1,14	.71

Polynomial equations [f(x)], Fisher values [𝐹], coefficients of determination [r²], degrees of freedom [df], and estimates of 𝑃-value are shown.