Table 1.

The pH, soil electrical conductivity (SEC), soil water content (SWC), soil nitrate-N content (SNNC), soil ammonium-N content (SANC), soil available potassium (AK), soil available phosphorus (AP), soil alkali-hydrolyzable nitrogen content (SAHC), soil organic matter (SOM) in different irrigation amount (W), fertilizer rates (F) and potato varieties (V) at the tuber maturity stage.

Treatments	Soil layer (cm)	pH	SEC (US cm−1)	SWC (%)	SNNC (mg kg−1)	SANC (mg kg−1)	AK (mg kg−1)	AP (mg kg−1)	SAHC (mg kg−1)	SOM (g kg−1)
T1	0–20	8.10 d	407.67 ab	9.27 a	130.54 a	3.02 c	131.01 ab	23.18 bc	44.74 ab	8.13 a
	20–40	8.14 de	314.83 abc	12.40 a	88.35 a	2.56 bc	121.83 ab	14.35 bc	31.01 abc	7.89 a
	40–60	8.34 c	173.22 abc	11.43 a	16.94 a	2.64 a	92.17 a	8.86 a	16.45 a	3.25 a
T2	0–20	8.53 b	162.63 c	7.73 b	120.84 a	2.92 c	136.33 a	24.73 bc	33.89 cd	8.41 a
	20–40	8.66 b	132.72 f	10.77 b	85.27 ab	2.55 bc	91.33 abc	16.68 abc	23.55 cde	6.35 abc
	40–60	8.74 b	99.38 c	11.23 ab	15.75 ab	2.82 a	64.17 c	7.00 b	12.05 ab	2.92 a
T3	0–20	8.29 c	359.67 b	9.08 a	105.66 ab	2.26 d	121.83 abc	21.19 c	31.53 cd	6.27 c
	20–40	8.48 c	244.60 cde	12.73 a	77.27 ab	2.07 c	109.23 abc	17.72 abc	19.08 de	4.65 c
	40–60	8.64 b	150.83 abc	10.51 bcd	15.15 ab	2.14 a	83.00 ab	5.59 c	11.26 b	3.01 a
T4	0–20	7.98 d	577.67 a	9.10 a	120.97 a	2.97 c	133.83 a	22.65 bc	39.11 bc	7.25 ab
	20–40	8.27 d	297.32 abcd	11.98 a	87.56 ab	2.52 bc	125.13 ab	18.59 ab	32.26 ab	6.27 abc
	40–60	8.33 c	212.48 a	10.88 abc	14.79 ab	2.46 a	95.00 a	6.55 bc	15.78 ab	3.87 a
T5	0–20	7.70 e	356.17 b	7.66 b	118.18 ab	3.02 c	136.83 a	20.40 c	30.71 cd	6.36 c
	20–40	8.09 e	169.40 ef	10.05 bc	80.79 ab	2.80 ab	100.33 abc	13.71 c	26.13 bcd	6.36 abc
	40–60	8.42 c	109.45 bc	11.66 a	14.58 ab	2.39 a	70.50 bc	7.75 ab	14.01 ab	3.44 a
T6	0–20	8.32 c	359.33 b	6.97 b	94.58 b	2.59 cd	111.67 bc	21.90 bc	28.03 d	7.22 ab
	20–40	8.67 b	200.58 def	9.46 cd	73.53 ab	2.68 b	67.67 c	14.73 bc	15.93 e	6.18 abc
	40–60	8.80 b	191.62 a	10.28 cd	13.14 b	2.69 a	63.17 c	7.08 b	11.23 b	3.32 a
T7	0–20	8.32 c	513.50 ab	6.91 b	128.65 a	3.85 a	135.00 a	30.52 a	37.80 bc	6.45 c
	20–40	8.48 c	351.17 ab	7.95 e	81.97 ab	3.24 a	95.33 abc	18.31 ab	35.03 a	6.42 abc
	40–60	8.64 b	164.40 abc	9.65 de	13.14 b	2.66 a	72.67 bc	7.80 ab	15.24 ab	3.99 a
T8	0–20	8.30 c	523.33 ab	6.97 b	125.90 a	3.58 ab	124.02 abc	27.21 ab	49.76 a	7.96 a
	20–40	8.44 c	394.50 a	8.79 de	83.53 ab	2.7a ab	142.17 a	20.39 a	33.80 ab	6.88 ab
	40–60	8.77 b	218.62 a	9.36 e	14.39 ab	2.05 a	71.67 bc	5.20 c	12.70 ab	2.94 a
T9	0–20	8.69 a	574.50 a	6.87 b	117.78 ab	3.10 bc	105.17 c	23.91 bc	32.11 cd	7.54 ab
	20–40	9.01 a	262.15 bcde	8.22 e	69.29 b	3.07 ab	89.37 bc	15.40 bc	22.34 de	4.99 bc
	40–60	9.10 a	188.77 ab	9.92 de	13.91 b	2.21 a	62.67 c	7.60 ab	13.09 ab	3.18 a
	Significance test
	W	**	**	**	ns	**	ns	**	**	ns
	F	**	**	**	**	**	**	*	**	**
	V	**	ns	ns	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).