Table 1 Characteristics of original soil.

Soil texture

Clay loam

Clay (%)^a

22.8 ± 0.8

Silt (%)^a

43.2 ± 1.2

Sand (%)^a

34.0 ± 0.5

pH

8.07 ± 0.07

Organic matter (g·kg⁻¹)^a

19.0 ± 0.2

Total N (g·kg⁻¹)^a

1.34 ± 0.06

Alkali-hydrolyzable N (mg·kg⁻¹)^a

116 ± 4

Olsen-P (mg·kg⁻¹)^a

105 ± 3

Rapidly available K (mg·kg⁻¹)^a

248 ± 8

Available Cu (mg·kg⁻¹)^a

3.35 ± 0.07

Available Zn (mg·kg⁻¹)^a

5.64 ± 0.06

Available Ca (mg·kg⁻¹)^a

3560 ± 42

Available Fe (mg·kg⁻¹)^a

31.4 ± 1.3

Available Mn (mg·kg⁻¹)^a

4.21 ± 0.07

Available Mg(mg·kg⁻¹)^a

2370 ± 35