Table 4.

Percent of variance explained by each factor (Rootstock and Irrigation) and the interaction (RxI) for the maturity variables in each cultivar and season.

Season	Days post-Veraison	Variable	Cabernet Sauvignon			Syrah
			R	I	RxI	R	I	RxI
S1	15	TSS	26.9	33.2			30
		TA	22.9	41.1			47.6
		pH
	24	TSS		56			21.4
		TA		53.4			24.8
		pH		25.2
	32	TSS		35.4			34.7
		TA		74.7			52.4
		pH		36.1
	37	TSS		32.1			26.5
		TA		43.7			45.7
		pH
S2	5	TSS					14.6
		TA
		pH						47
	12	TSS					16.7
		TA
		pH
	24	TSS				38.3	11.7
		TA		23.8		44
		pH		26.7		37.9
	32	TSS
		TA	35.5			42.2	13.6
		pH	41.2
S3	4	TSS
		TA
		pH
	12	TSS
		TA					21.6
		pH
	22	TSS
		TA		21.9	35.1		17.8
		pH
	30	TSS		21.9			28.9
		TA		23	35.5		50.3
		pH

Only factors which explained a significant portion of the variance (p < 0.05) are plotted. The percent variance explained by each factor is indicated using the value (%) and color. Darker colors explain a higher variance in each cultivar and season.

R, Rootstock; I, Irrigation; S1, 2018–2019 season; S2, 2019–2020 season; S3, 2020–2021 season; TSS, Total soluble solids; TA, Titratable Acidity.