In order to study the change of the SOC's

Nitrogen's

SMBC's and SMBN's contents in soil

a experiment on the long-term locating field plots was performed smoothly on the semi-humid areas of the west of the Henan province.The results suggested that organic carbon in soil and nitrogen in soil are both increased under the sub-soiling tillage and no-tillage.Comparing with the other tillage patterns

the sub-soiling tillage have a highest SOC contents in soil

that is 6.79 g/kg

13.82% improved comparing to the traditional tillage.Nitrogen contents in soil under no-tillage have a highest contents among the above tillage patterns that is 0.797 g/kg

10.42% improved comparing to the traditional tillage.SOC and nitrogen is decreasing with soil layer being deepened.In the 0~20 cm soil layer under the sub-soiling tillage and no-tillage

SMBC and SMBN contents have been 79.3%

19.9% and 17.92%

8.13% improved comparing to the traditional tillage

and then the phenomenon of the bacterial enrichment was occurred under the low sloping soil.The positive co-relation distinguishedly was appeared between the SMBC and nitrogen in soil

SMBN

SMBC

and SMBN can be considered as the biological indexes to estimate the quality of the soil

for which have a distinguished relation.Hence

the subsoiling tillage and no-tillage have perfect future in appliance.