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

Table 4

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

Parameter	Compartment	Analysis	Treatment	𝑓(𝑥)	𝐹	𝑟^2	𝑑𝑓	𝑃
Soil-Zn	Peripheral	Pre-Experimental	Unseeded	1.015𝑥−1.45	5060	0.99	1,14	<10^−3
		Post-Experimental	Unseeded	−(4.7^𝑒−4)𝑥^2+0.89𝑥−1.46	2573	0.99	1,14	<10^−3
			Hyphosphere	−(4.7^𝑒−4)𝑥^2+0.86𝑥−3.76	618.8	0.98	2,13	<10^−3
			Mycorrhizosphere	−(7.5^𝑒−4)𝑥^2+0.97𝑥−8.48	475.9	0.98	2,13	<10^−3
			Rhizosphere	−0.001𝑥^2+0.91𝑥−5.20	249.7	0.97	2,13	<10^−3
	Central	Pre-Experimental	Unseeded	(1.0^𝑒−7)𝑥+0.06	0.10	0.01	1,14	.75
		Post-Experimental	Unseeded	(1.0^𝑒−7)𝑥+0.04	1.29	0.08	1,14	.27
			Hyphosphere	(1.0^𝑒−7)𝑥+0.03	1.46	0.09	1,14	.25
			Mycorrhizosphere	(1.0^𝑒−7)𝑥+0.03	1.52	0.10	1,14	.24
			Rhizosphere	(1.0^𝑒−7)𝑥+0.07	0.01	0.01	1,14	.96

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