Abstract
Abstract Sustaining or increasing soil productivity depends in part on soil and crop management practices that maintain or increase soil organic matter. This study was conducted to determine the effects of tillage, crop rotation, and fertilizer N on soil organic C and N. Two long‐term tillage/rotation studies and one long‐term rotation/N‐rate study were conducted on eastern Kansas soils. Soils were sampled from conventional (CT) and no‐tillage (NT) treatments applied to continuous sorghum [ Sorghum bicolor (L.) Moench] (S/S), continuous soybean [ Glycine max (L.) Merr.] (B/B), and sorghum‐soybean (S/B) rotations in the tillage/rotation studies and from the 0 and 252 kg N ha −1 treatments on continuous corn ( Zea mays L.) (C/C), B/B, and corn‐soybean (C/B) rotations in the rotation/N‐rate study. Organic C and N were determined on soils sampled at depths of 0 to 2.5, 2.5 to 7.5, 7.5 to 15, and 15 to 30 cm. Compared with CT, NT had greater organic C and N contents. Compared with B/B, S/B and S/S increased orgnaic C and N under NT and, to a lesser extent, under CT (at 0‐2.5‐cm depth). Increases in organic C and N with NT compared with CT and with sorghum rotations compared with B/B were directly related to the quantity of residue produced and left on the soil surface (S/S > S/B / > B/B). Fertilizer N increased soil organic C and N only slightly. Crop management systems that include rotations with high residue‐producing crops and maintenance of surface residue cover with reduced tillage result in greater soil organic C and N, which may improve soil productivity.
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Claims 5
Claim · model-written summary
No-tillage had greater soil organic C and N contents than conventional tillage.
- Taxon
- Sorghum bicolor
Sorghum bicolore1 - Treatment
- NTe2
- Outcome
- organic C and N contentse2
- Direction
- greatere2
- Comparator
- CTe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“continuous sorghum [ Sorghum bicolor (L.) Moench] (S/S)”
e2“Compared with CT, NT had greater organic C and N contents”
Claim · model-written summary
Sorghum rotations increased soil organic C and N under no-tillage compared with the soybean-only rotation.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- S/B and S/Se3
- Outcome
- C and Ne3
- Direction
- increasede3
- Comparator
- B/Be3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“continuous sorghum [ Sorghum bicolor (L.) Moench] (S/S)”
e3“Compared with B/B, S/B and S/S increased orgnaic C and N under NT”
Claim · model-written summary
Increases in soil organic C and N with no-tillage and sorghum rotations were directly related to the quantity of crop residue left on the soil surface.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- quantity of residue produced and left on the soil surfacee4
- Outcome
- Increases in organic C and Ne4
- Direction
- increaseinferrede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“continuous sorghum [ Sorghum bicolor (L.) Moench] (S/S)”
e4“Increases in organic C and N with NT compared with CT and with sorghum rotations compared with B/B were directly related to the quantity of residue produced and left on the soil surface”
Claim · model-written summary
Fertilizer N increased soil organic C and N only slightly.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Treatment
- Fertilizer Ne5
- Outcome
- soil organic C and Ne5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“continuous sorghum [ Sorghum bicolor (L.) Moench] (S/S)”
e5“Fertilizer N increased soil organic C and N only slightly”
Claim · model-written summary
Crop management with high-residue rotations and reduced tillage may result in greater soil organic C and N, which may improve soil productivity.
- Taxon
- Sorghum bicolorSorghum bicolore1
- Outcome
- greater soil organic C and Ne6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“continuous sorghum [ Sorghum bicolor (L.) Moench] (S/S)”
e6“result in greater soil organic C and N, which may improve soil productivity”
The same questions in other papers
tillage · nutrient: content · Sorghum bicolor (sorghum)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.