Characterisation of soils under long-term crop cultivation without fertilisers: a case study in Japan

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Table 8 Biological properties of the soils sampled from Eniwa and Narita farms

Horizon	B _C (µg g⁻¹)	B _N (µg g⁻¹)	β-Glucosidase (µmol h⁻¹ g⁻¹)	Protease (µmol h⁻¹ g⁻¹)
E-UF
Ap	360.77 ± 19.15**	11.97 ± 1.24**	0.934 ± 0.12**	0.414 ± 0.04**
A1	289.68 ± 33.98	8.37 ± 0.90	0.615 ± 0.07	0.284 ± 0.02**
E-CF
Ap1	271.75 ± 43.02**	6.76 ± 2.45**	0.512 ± 0.08**	0.102 ± 0.05**
Ap2	250.19 ± 89.74	8.54 ± 2.29	1.194 ± 0.37	0.482 ± 0.07**
N-UF
Ap	247.51 ± 35.00*	11.26 ± 2.52	1.244 ± 0.24	0.123 ± 0.02**
A1	129.43 ± 3.38*	6.62 ± 3.98	0.685 ± 0.16	0.054 ± 0.02**
N-CF
Ap	161.07 ± 6.11*	10.24 ± 1.43	0.839 ± 0.04	n.d.
A1	106.48 ± 5.62*	1.74 ± 0.13	0.473 ± 0.10	0.018 ± 0.01**

n.d. not detected
*, ** Significant at the 0.05 and 0.01 probability levels among depths between UF and CF at the same location, respectively (Student’s t test)