From: Dryland soil chemical properties and crop yields affected by long-term tillage and cropping sequence
Tillage and cropping sequencea | Soil depth | |||||
---|---|---|---|---|---|---|
0–7.5 cm | 7.5–15 cm | 15–30 cm | 30–0 cm | 60–90 cm | 90–120 cm | |
Zn concentration (mg Zn kg−1) | ||||||
NTCW | 2.33abAc | 0.42B | 0.14B | 0.16B | 0.14B | 0.21B |
STCW | 1.88abA | 0.40B | 0.21B | 0.17B | 0.17B | 0.36B |
FSTCW | 1.71abA | 0.52B | 0.19B | 0.21B | 0.23B | 0.38B |
FSTW-B/P | 1.15bA | 0.56B | 0.25B | 0.21B | 0.18B | 0.20B |
STW-F | 0.96bA | 0.35B | 0.20B | 0.24B | 0.32B | 0.30B |
Contrast | ||||||
NT vs. T | 0.54 | −0.04 | −0.06 | −0.03 | −0.06 | −0.16 |
CW vs. W-F | 0.92* | 0.05 | 0.01 | −0.07 | −0.15 | 0.06 |
CW vs. W-B/P | 0.56 | −0.04 | −0.06 | −0.00 | 0.05 | 0.18* |
CEC (cmolc kg−1) | ||||||
NTCW | 14.3aC | 11.6C | 22.2B | 32.8A | 33.9A | 33.1A |
STCW | 14.5aC | 12.9C | 19.3B | 29.0A | 34.0A | 33.5A |
FSTCW | 14.6aC | 13.3C | 25.1B | 34.0A | 34.2A | 33.8A |
FSTW-B/P | 13.4aC | 14.2C | 23.5B | 30.0A | 32.0A | 33.9A |
STW-F | 11.9bC | 15.9BC | 24.3AB | 29.7A | 33.2A | 33.3A |
Contrast | ||||||
NT vs. T | −0.3 | −1.5 | 0.0 | 1.3 | −0.2 | −0.6 |
CW vs. W-F | 2.6** | −3.0 | −5.0 | −0.7 | 0.8 | 0.2 |
CW vs. W–B/P | 1.2 | −0.9 | 1.6 | 4.0 | 2.2 | −0.1 |