Organic carbon and total nitrogen stocks in a Vertisol following 40 years of no-tillage, crop residue retention and nitrogen fertilisation · Knowledge Library

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Organic carbon and total nitrogen stocks in a Vertisol following 40 years of no-tillage, crop residue retention and nitrogen fertilisation · Knowledge Library

soil total N stocks

↑ 6= 713

no effect
NT vs. CTnot significant · 0–30 cm · May2008 · Hermitage Research Station · Tillage maineffect, reportedSTNstockevaluation0–30; no unavailablegroupmeans.
Source · p. 5
“tillage practices had no significant effect on total N after 40 years.”
increase
CRR vs. CRBsignificant · 0–10 cm · May2008 · Hermitage Research Station · Fig5i CRR0b/CRB0a =>significantincreasewithoutN, contraryabstractonlywithN; reviewerattention.
Source · p. 5
“The crop residue N fertiliser interaction effects on soil total N stocks at the 0–0.1 m depth are presented in Fig. 5.”
no effect
CRR vs. CRBnot significant · 0–30 cm · May2008 · Hermitage Research Station · CUMULATIVE0–20/0–30 only;Fig5iiab/a,iiia/a; surfaceexceptionkeptseparate.
Source · p. 1
“CRR increased SOC and soil total N only when N fertiliser was applied”
Source · p. 5
“cumulative amounts of STN at the 0–0.2 m and 0–0.3 m depths were significantly higher in the”
increase
CRR vs. CRBsignificant · 0–10 cm · May2008 · Hermitage Research Station · Fig5i CRR30c/CRB30ab.
Source · p. 1
“CRR increased SOC and soil total N only when N fertiliser was applied”
Source · p. 5
“The crop residue N fertiliser interaction effects on soil total N stocks at the 0–0.1 m depth are presented in Fig. 5.”
no effect
CRR vs. CRBnot significant · 0–30 cm · May2008 · Hermitage Research Station · CUMULATIVE0–20/0–30 only;Fig5iib/ab,iiia/a.
Source · p. 5
“cumulative amounts of STN at the 0–0.2 m and 0–0.3 m depths were significantly higher in the CRR-90N treatment than any other treatment”
increase
CRR vs. CRBsignificant · 0–30 cm · May2008 · Hermitage Research Station · CUMULATIVE0–10/0–20/0–30;Fig5d/ab,c/ab,b/a.
Source · p. 1
“CRR increased SOC and soil total N only when N fertiliser was applied”
Source · p. 5
“CRR-90N treatment than any other treatment”
no effect
30N vs. 0Nnot significant · 0–30 cm · May2008 · Hermitage Research Station · CUMULATIVE0–10/0–20/0–30;Fig5allburnedpairs sharea.
Source · p. 5
“Soil total N increased with N fertiliser application rate when the crop residue was retained but had no effect when the crop residue was burned”
no effect
90N vs. 0Nnot significant · 0–30 cm · May2008 · Hermitage Research Station · CUMULATIVE0–10/0–20/0–30;Fig5allburnedpairs sharea.
Source · p. 5
“Soil total N increased with N fertiliser application rate when the crop residue was retained but had no effect when the crop residue was burned”
increase
30N vs. 0Nsignificant · 0–10 cm · May2008 · Hermitage Research Station · Fig5i c/b,LSD74kgN/ha.
Numbers
- mean_difference 80
Source · p. 5
“Soil total N increased by 80 kg N ha 1 with 30 kg N ha 1 year 1 fertiliser N application”
no effect
30N vs. 0Nnot significant · 0–30 cm · May2008 · Hermitage Research Station · CUMULATIVE0–20/0–30 only,Fig5iib/ab,iiia/a; notsurface.
Source · p. 5
“cumulative amounts of STN at the 0–0.2 m and 0–0.3 m depths were significantly higher in the CRR-90N treatment than any other treatment”
increase
90N vs. 0Nsignificant · 0–30 cm · May2008 · Hermitage Research Station · CUMULATIVE0–10/0–20/0–30,Fig5d/b,c/ab,b/a; LSD74surface/233profile.
Numbers
- mean_difference 209 · 0–10 cm
- mean_difference 352 · 0–30 cm
Source · p. 5
“Soil total N increased with N fertiliser application rate when the crop residue was retained”
Source · p. 5
“CRR-90N treatment than any other treatment”
increase
90N vs. 30Nsignificant · 0–30 cm · May 2008 · Hermitage Research Station · CUMULATIVE 0-10, 0-20 and 0-30 cm stocks, averaged over tillage. Fig.5 retained-residue 90N/30N letters d/c, c/b, b/a, respectively. No chart means or subtraction of reported 0N-reference effects.
Source · p. 5
“Soil total N increased with N fertiliser application rate when the crop residue was retained”
Source · p. 5
“cumulative amounts of STN at the 0–0.2 m and 0–0.3 m depths were significantly higher in the CRR-90N treatment than any other treatment”
no effect
CRR vs. CRBnot significant · 10–30 cm · May 2008 · Hermitage Research Station · INDIVIDUAL 10-20 and 20-30 cm layers, two-level residue main comparison across tillage/N; no group means or separate display supplied. Distinct from cumulative conditional stock findings.
Source · p. 5
“There was no significant treatment effect on STN at the 0.1– 0.2 m and 0.2–0.3 m depths.”
Source · p. 6
“but generally not at 0.1–0.2 m and 0.2–0.3 m depths.”

d15N values of soil total N

↑ 1↓ 3= 48

no effect
NT vs. CTnot significant · 0–30 cm · May2008 · Hermitage Research Station · Table3two-leveltillagens ateachdepth, LSD.23/.23/.20.
Numbers
- treatment 10.02 vs. control 9.89 per mil (+1.314 %) · 0–10 cm
- treatment 9.44 vs. control 9.28 per mil (+1.724 %) · 10–20 cm
- treatment 9 vs. control 9 per mil (0 %) · 20–30 cm
Source · p. 5
“The d15N values of STN were not affected by the tillage practices at any depth”
increase
CRR vs. CRBsignificant · 0–20 cm · May2008 · Hermitage Research Station · Residueenrichment,Table3LSD.23 eachdepth.
Numbers
- treatment 10.27 vs. control 9.64 per mil (+6.535 %) · 0–10 cm
- treatment 9.49 vs. control 9.24 per mil (+2.706 %) · 10–20 cm
Source · p. 6
“residue was retained than where crop residue was burned at both the 0–0.1 m and 0.1–0.2 m depths”
no effect
CRR vs. CRBnot significant · 20–60 cm · May2008 · Hermitage Research Station · ActualTable3LSD.20ns at20–30;30–60nullinprose,data not reported.
Numbers
- treatment 9.06 vs. control 8.94 per mil (+1.342 %) · 20–30 cm
Source · p. 6
“but not at either the 0.2–0.3 m depth (Table 3) or the 0.3–0.6 m depth (data not reported).”
decrease
30N vs. 0Nsignificant · 0–20 cm · May2008 · Hermitage Research Station · Table3d15Ndifferences.41/.31 exceedpairLSD.28; noomnibusalpha.
Numbers
- treatment 10.03 vs. control 10.44 per mil (-3.927 %) · 0–10 cm
- treatment 9.3 vs. control 9.61 per mil (-3.226 %) · 10–20 cm
Source · p. 6
“The d15N values of STN were significantly affected by N fertiliser application in the top 0.3 m depths, generally decreasing with increasing rate of N fertiliser application”
no effect
30N vs. 0Nnot significant · 20–30 cm · May2008 · Hermitage Research Station · ActualTable3 30Nminus0N magnitude.13 belowLSD.24; exceptiontooverallNstatement.
Numbers
- treatment 9 vs. control 9.13 per mil (-1.424 %)
Source · p. 5
“0N 10.44 0.28 9.61 0.28 9.13 0.24”
Source · p. 5
“30N 10.03 9.30 9.00”
decrease
90N vs. 0Nsignificant · 0–30 cm · May2008 · Hermitage Research Station · Allthree90N/0N differences exceedLSD.28/.28/.24.
Numbers
- treatment 9.39 vs. control 10.44 per mil (-10.06 %) · 0–10 cm
- treatment 9.17 vs. control 9.61 per mil (-4.579 %) · 10–20 cm
- treatment 8.88 vs. control 9.13 per mil (-2.738 %) · 20–30 cm
Source · p. 6
“The d15N values of STN were significantly affected by N fertiliser application in the top 0.3 m depths, generally decreasing with increasing rate of N fertiliser application”
decrease
90N vs. 30Nsignificant · 0–10 cm · May 2008 · Hermitage Research Station · N-rate marginal means across tillage and residue; Table 3 pair difference exceeds printed LSD0.05=0.28 per mil. No omnibus P assigned to pair.
Numbers
- treatment 9.39 vs. control 10.03 per mil (-6.381 %) · 0–10 cm
Source · p. 6
“generally decreasing with increasing rate of N fertiliser application”
Source · p. 5
“30N 10.03 9.30 9.00”
Source · p. 5
“90N 9.39 9.17 8.88”
no effect
90N vs. 30Nnot significant · 10–30 cm · May 2008 · Hermitage Research Station · N-rate marginal means across tillage/residue; pair differences below Table 3 LSD0.05=0.28 at 10-20 cm and 0.24 at 20-30 cm. Depth exception to N-depletion result, not inferred from an overall F test.
Numbers
- treatment 9.17 vs. control 9.3 per mil (-1.398 %) · 10–20 cm
- treatment 8.88 vs. control 9 per mil (-1.333 %) · 20–30 cm
Source · p. 5
“0N 10.44 0.28 9.61 0.28 9.13 0.24”
Source · p. 5
“30N 10.03 9.30 9.00”
Source · p. 5
“90N 9.39 9.17 8.88”

Sites

Hermitage Research Station

Location: Hermitage Research Station, Queensland, Australia28.20° S, 152.10° E
Climate: 17.5 °C mean annual temperature685 mm annual precipitation
Soil: Vertisol · FAO; Pellustert (Ustic) · USDA
Land use: cereal croppingArable land
Management on the whole site: wheatWheat/Triticum aestivum

Soil layers
Depth	Texture	Clay	pH	Organic C	Bulk density
0–10 cm	black self-mulching cracking clay	65 %	–	–	–