Table 2 Soil physical and chemical properties classification standards.

From: The difference in cultivated land soil quality: a comparison between the north and south sides of the Tianshan Mountains

Index

Grad

Xa

Xb

Xc

SOM (g∙kg−1)

10

15

20

TN (g∙kg−1)

0.3

0.7

1.0

pH

7.5

8.0

8.5

AP (mg∙kg−1)

10

20

30

AK (mg∙kg−1)

150

200

300

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