Table 5.

The SSA in different irrigation amounts (W), fertilizer rates (F), and potato varieties (V) during S1, S2, S3, S4, and S5.

Treatments	Soil layer (cm)	S1	S2	S3	S4	S5
T1	0–20	17.96 ab	24.96 bc	20.54 b	21.22 abc	16.10 abc
	20–40	14.87 ab	17.39 d	17.79 a	16.09 ab	13.58 bc
	40–60	11.60 a	13.63 ab	9.74 a	12.38 a	10.77 ab
T2	0–20	19.76 a	28.25 ab	17.21 cd	22.45 abc	18.48 a
	20–40	18.47 a	23.70 ab	16.13 a	14.81 bc	13.05 c
	40–60	10.65 a	13.16 ab	9.94 a	12.41 a	9.90 b
T3	0–20	17.36 b	25.19 bc	19.36 bc	20.73 abc	12.96 d
	20–40	17.01 ab	19.98 bcd	16.58 a	13.78 c	14.06 abc
	40–60	12.27 a	12.89 ab	10.42 a	12.76 a	10.01 ab
T4	0–20	17.22 b	23.55 c	23.34 a	24.35 a	15.44 bc
	20–40	15.44 ab	19.78 bcd	16.57 a	16.10 ab	15.23 a
	40–60	12.59 ab	12.25 ab	9.56 a	12.52 a	10.92 ab
T5	0–20	16.02 bc	30.18 a	23.57 a	24.85 a	18.20 a
	20–40	14.49 ab	22.76 abc	17.82 a	16.85 a	14.95 ab
	40–60	11.36 a	13.82 a	9.55 a	13.22 a	10.59 ab
T6	0–20	20.10 a	29.93 a	17.86 bcd	24.02 ab	17.81 ab
	20–40	17.15 ab	24.41 a	17.99 a	15.67 abc	13.62 bc
	40–60	11.67 a	13.70 ab	10.12 a	13.20 a	10.59 ab
T7	0–20	16.44 bc	23.48 c	16.41 d	18.98 bc	16.11 abc
	20–40	15.79 ab	20.41 abcd	16.96 a	14.36 bc	13.25 c
	40–60	11.26 a	10.49 b	10.37 a	10.05 a	10.39 ab
T8	0–20	16.26 bc	24.80 bc	19.04 bcd	18.70 c	13.99 cd
	20–40	15.04 ab	20.77 abcd	17.79 a	14.27 bc	13.78 bc
	40–60	11.84 a	10.86 ab	10.35 a	11.02 a	11.37 a
T9	0–20	14.21 c	25.05 bc	16.61 cd	18.27 c	14.30 cd
	20–40	13.59 b	18.77 cd	15.44 a	15.25 abc	12.84 c
	40–60	11.89 a	11.17 ab	8.99 a	10.33 a	9.89 b
	Significance test
W		*	**	**	**	**
F		ns	**	ns	ns	**
V		ns	ns	ns	ns	ns

Different letters indicate significant difference at P < 0.05. ** indicates a remarkably significant difference (P < 0.01), * indicates a significant difference (P < 0.05), and ns indicates no significant difference (P > 0.05).