Table 5 Soil chemical properties in the 0–40 cm soil layer in experimental fields at Pengyang Experimental Station, Ningxia Province, China during 2013–2015.

From: Strategies for reducing the fertilizer application rate in the ridge and furrow rainfall harvesting system in semiarid regions

Year

Soil depth

TN (g kg−1)

SOM (g kg−1)

AN (mg kg−1)

AP (mg kg−1)

AK (mg kg−1)

2013

0–20 cm

0.86

12.3

52.1

8.8

106

20–40 cm

0.90

12.7

44.0

3.8

94

2014

0–20 cm

0.98

14.9

63.2

11.8

152

20–40 cm

0.90

13.4

49.5

4.0

113

2015

0–20 cm

0.85

12.3

33.9

6.5

139

20–40 cm

0.80

11.8

27.4

3.9

110

  1. Note: TN = total nitrogen; SOM = soil organic matter; AN = available nitrogen; AP = available phosphorus; AN = available potassium.
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