. 2020 Nov 17;10:19965. doi: 10.1038/s41598-020-77038-6

Table 5.

Linear regression analysis of dry matter yield and macronutrient extraction capacity by plants submitted to fertigation with raw sanitary sewage (dependent variables "y") as a function of the distance from the beginning of the furrows in meters (independent variable "x").

Treatments	Adjusted equation	R²	P-value	Significance
DM yield (Mg ha⁻¹ year⁻¹)
TFN	y = − 0.37 x + 27.59	0.8895	0.0014	*
TFA	y = 0.04 x + 29.09	0.2231	0.2845	ns
Total N (kg ha⁻¹ year⁻¹)
TFN	y = − 14.65 x + 711.01	0.8778	0.0019	*
TFA	y = 1.59 x + 655.24	0.0531	0.6190	ns
Total P (kg ha⁻¹ year⁻¹)
TFN	y = − 2.04 x + 113.13	0.6746	0.0235	*
TFA	y = 0.66 x + 88.31	0.1815	0.3405	ns
Total K (kg ha⁻¹ year⁻¹)
TFN	y = − 5.29 x + 388.98	0.8348	0.0040	*
TFA	y = 1.19 x + 484.93	0.1356	0.4164	ns

Statistical analysis by the F-test (p < 0.05; n = 21), where: *—significant regression adjustment; ns—data showed no significant regression adjustment; R²—determination coefficient; P-value—probability results of the F-test; TFN—Fertigation treatment with RS, without alternation in the application position in the furrows; TFA—Fertigation treatment with RS, with alternation in the application position in the furrows.