Table 3. Soil physicochemical and biological properties under different fertilizer treatments in 2018 and 2019.

□	□	CK	RSMT	SBMT	CMT
pH	2018	6.81 ± 0.03bA	6.92 ± 0.06bA	6.94 ± 0.03bA	7.18 ± 0.05aA
	2019	6.80 ± 0.03cA	7.01 ± 0.01bA	7.01 ± 0.01bA	7.10 ± 0.00aA
SOM (g kg−1)	2018	13.38 ± 0.36cA	14.89 ± 0.17bB	17.36 ± 0.66aB	16.82 ± 0.09aB
	2019	11.12 ± 0.51dB	17.16 ± 0.52cA	22.49 ± 0.67aA	20.85 ± 0.12bA
TN (g kg−1)	2018	0.78 ± 0.02cA	0.93 ± 0.02bB	1.07 ± 0.01aB	0.96 ± 0.02bB
	2019	0.63 ± 0.01cB	1.08 ± 0.01bA	1.20 ± 0.03aA	1.17 ± 0.01aA
TP (g kg−1)	2018	0.74 ± 0.03bA	0.83 ± 0.05bB	1.02 ± 0.09aA	0.81 ± 0.03bA
	2019	0.68 ± 0.03cA	0.99 ± 0.01bA	1.13 ± 0.02aA	0.98 ± 0.02bA
TK (g kg−1)	2018	17.25 ± 0.12bA	17.49 ± 0.15bA	18.62 ± 0.29aA	17.43 ± 0.27bB
	2019	17.04 ± 0.34bA	17.89 ± 0.15aA	18.34 ± 0.25aB	17.75 ± 0.13abA
AN (mg kg−1)	2018	48.15 ± 2.28cA	63.75 ± 2.73bB	79.54 ± 3.48aB	71.92 ± 4.51abB
	2019	43.04 ± 2.10dA	74.90 ± 2.56cA	90.06 ± 1.14aA	82.06 ± 2.01bA
AP (mg kg−1)	2018	49.22 ± 2.87dA	68.22 ± 2.87cB	109.29 ± 3.33aB	80.73 ± 3.33bB
	2019	39.53 ± 2.66dA	90.64 ± 1.18cA	122.60 ± 2.00aA	99.56 ± 1.35bA
AK (mg kg−1)	2018	128.76 ± 1.59dA	142.72 ± 1.64cB	162.31 ± 0.34aB	158.23 ± 0.72bB
	2019	123.28 ± 1.93cA	237.95 ± 5.00bA	263.01 ± 5.66aA	229.88 ± 0.91bA
MBC (mg kg−1)	2018	88.22 ± 2.11cA	115.98 ± 5.13bB	125.24 ± 0.82bB	138.76 ± 4.95aB
	2019	79.62 ± 2.98cA	137.56 ± 1.28bA	238.05 ± 3.19aA	245.54 ± 6.85aA
MBN (mg kg−1)	2018	12.93 ± 0.04cA	18.87 ± 1.28bB	21.79 ± 1.12abB	22.93 ± 1.26aB
	2019	13.40 ± 0.62dA	22.91 ± 0.54cA	38.10 ± 0.22bA	40.00 ± 0.66aA
Bacteria (nmol g−1)	2018	8.27 ± 1.39bA	9.46 ± 0.20abA	12.79 ± 1.25aA	11.42 ± 0.79abA
	2019	6.94 ± 0.94bA	9.38 ± 0.23abA	11.95 ± 1.16aA	10.70 ± 0.26aA
Fungi (nmol g−1)	2018	0.90 ± 0.16aA	1.01 ± 0.05aA	1.13 ± 0.11aA	1.09 ± 0.08aA
	2019	0.66 ± 0.11cA	0.94 ± 0.04bA	1.20 ± 0.08aA	1.14 ± 0.05abA
Actinomycetes (nmol g−1)	2018	0.55 ± 0.10bA	0.69 ± 0.19bB	1.60 ± 0.14aA	0.99 ± 0.25bA
	2019	1.00 ± 0.13bA	1.34 ± 0.05abA	1.75 ± 0.21aA	1.58 ± 0.06aA
AMF (nmol g−1)	2018	0.35 ± 0.07bA	0.42 ± 0.00abA	0.57 ± 0.06aA	0.54 ± 0.04aA
	2019	0.28 ± 0.05cA	0.42 ± 0.03bA	0.58 ± 0.05aA	0.52 ± 0.01abA
Total PLFA (nmol g−1)	2018	9.72 ± 1.52bA	11.16 ± 0.09bA	15.52 ± 1.50aA	13.50 ± 0.91abA
	2019	8.60 ± 1.18bA	11.66 ± 0.31abA	14.89 ± 1.45aA	13.42 ± 0.33aA
Soil aggregate fractions	M	41.13% ± 0.04b	57.46% ± 0.00a	60.93% ± 0.01a	59.02% ± 0.0a
	m	39.99% ± 0.02a	30.74% ± 0.01b	29.01% ± 0.03b	28.42% ± 0.01b
	S + C	18.88% ± 0.02a	11.80% ± 0.01b	10.06% ± 0.02b	12.56% ± 0.02b

Notes.

Data were means ± standard error (n = 3). Different lowercase letters indicate significant differences at P < 0.05 level among the four treatments in the same year. Different capital letters indicate significant difference at P < 0.05 level between 2018 and 2019 in the same treatment. CK, RSMT, SBMT and CMT represent no organic fertilizer treatment, rapeseed meal treatment, soybean meal treatment and cattle manure treatment, respectively.

SOM

soil organic matter

TN

total nitrogen

TP

total phosphorus

TK

total potassium

AN

available nitrogen

AP

available phosphorus

AK

available potassium

MBC

microbial biomass carbon

MBN

microbial biomass nitrogen

AMF

arbuscular mycorrhizae fungi

M

large macroaggregate + small macroaggregate

m

microaggregate

S + C

silt + clay