Total C (mg∙kg−1)

Total N (mg∙kg−1)

Total P (mg∙kg−1)

Total K (mg∙kg−1)

C/N ratio

NO− 3-N (mg∙kg−1)

NH+ 4-N (mg∙kg−1)

Available phosphoric acid (mg∙kg−1)

Exchangeable potassium (mg∙kg−1)

pH

EC (mS∙cm−1)

Black soil

59,520

±

8.16Z

2692

±

0.12

677

±

1.63

1106

±

2.45

22.1

±

0.08

9.0 ± 0.8

0 ± 0.0

12.0 ± 2.45

57 ± 1.63

5.5 ± 0.1

0.14 ± 0.02