Abstract
Abstract The combination of subsoil compaction and injudicious usage of nitrogenous fertilizers are key factors that may lower crop yields, especially in soils with a shallow hardpan. Therefore, the objective of this study was to determine the effects of tillage and N application on carinata productivity in rainfed conditions. A 3‐year field study was conducted at the North Florida Research and Education Center, Quincy, FL, USA. Treatments were four rates of N (0, 45, 90, and 135 kg N ha −1 ) and three tillage methods (disking, chiseling, and no‐tillage). Maximum cone index measurements for no‐tillage occurred at 15 cm but at 20 cm soil depth for both chisel and disk tillage. A hardpan at 15 cm restricted taproot growth but promoted lateral root growth. Subsoiling and N application improved carinata growth relative to no‐tillage. Seed yield response to N application rate depended on the tillage method. The agronomic maximum seed yield occurred at 134, 128, and 125 kg N ha −1 for chisel, disk, and no‐tilled systems. Nitrogen agronomic efficiency was greatest at 45 kg N ha −1 for the chisel method and 95 kg N ha −1 for disk and no‐tillage. Tillage has a greater potential to increase yields even at relatively low N levels. When tilled, carinata produces 8%–17% greater seed yield at 45 kg N ha −1 than no‐tilled carinata grown with 135 kg N ha −1 . These results indicate that tilling the subsoil and applying 90–135 kg N ha −1 are required for carinata production in soils with a hardpan.
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Claims 14
Claim · model-written summary
Maximum soil cone index occurred at 15 cm under no tillage and at 20 cm under chisel and disk tillage.
- Taxon
- Brassica carinata
Brassica carinatat0 - Outcome
- Maximum cone index measurementse0
- Value
- 15 cme0
- Qualifier
- 20 cm soil depthe0
- Comparator
- chisel and disk tillagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum cone index measurements for no‐tillage occurred at 15 cm but at 20 cm soil depth for both chisel and disk tillage.”
t0“rainfed Brassica carinata”
Claim · model-written summary
The hardpan restricted carinata taproot growth.
- Taxon
- Brassica carinataBrassica carinatat0
- Organ / stage
- taproote0
- Outcome
- taproot growthe0
- Direction
- restrictede0
- Value
- 15 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A hardpan at 15 cm restricted taproot growth but promoted lateral root growth.”
t0“rainfed Brassica carinata”
Claim · model-written summary
The hardpan promoted lateral root growth.
- Taxon
- Brassica carinataBrassica carinatat0
- Organ / stage
- lateral roote0
- Outcome
- lateral root growthe0
- Direction
- promotede0
- Value
- 15 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A hardpan at 15 cm restricted taproot growth but promoted lateral root growth.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Subsoiling and nitrogen improved carinata growth versus no tillage.
- Taxon
- carinataBrassica carinatae0
- Treatment
- Subsoiling and N applicatione0
- Outcome
- carinata growthe0
- Direction
- improvede0
- Comparator
- no‐tillagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsoiling and N application improved carinata growth relative to no‐tillage.”
Claim · model-written summary
Seed yield response to nitrogen rate depended on tillage method.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- N application ratee0
- Outcome
- Seed yield responsee0
- Qualifier
- depended on the tillage methode0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield response to N application rate depended on the tillage method.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Maximum agronomic seed yield under chisel tillage occurred at 134 kg N ha −1.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- chisele0
- Outcome
- agronomic maximum seed yielde0
- Direction
- maximume0
- Value
- 134e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The agronomic maximum seed yield occurred at 134, 128, and 125 kg N ha −1 for chisel, disk, and no‐tilled systems.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Maximum agronomic seed yield under disk tillage occurred at 128 kg N ha −1.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- diske0
- Outcome
- agronomic maximum seed yielde0
- Direction
- maximume0
- Value
- 128e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The agronomic maximum seed yield occurred at 134, 128, and 125 kg N ha −1 for chisel, disk, and no‐tilled systems.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Maximum agronomic seed yield under no tillage occurred at 125 kg N ha −1.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- no‐tillede0
- Outcome
- agronomic maximum seed yielde0
- Direction
- maximume0
- Value
- 125 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The agronomic maximum seed yield occurred at 134, 128, and 125 kg N ha −1 for chisel, disk, and no‐tilled systems.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Nitrogen agronomic efficiency was greatest at 45 kg N ha −1 with chisel tillage.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- chisel methode0
- Outcome
- Nitrogen agronomic efficiencye0
- Direction
- greateste0
- Value
- 45 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen agronomic efficiency was greatest at 45 kg N ha −1 for the chisel method and 95 kg N ha −1 for disk and no‐tillage.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Nitrogen agronomic efficiency was greatest at 95 kg N ha −1 with disk tillage.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- diske0
- Outcome
- Nitrogen agronomic efficiencye0
- Direction
- greateste0
- Value
- 95 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen agronomic efficiency was greatest at 45 kg N ha −1 for the chisel method and 95 kg N ha −1 for disk and no‐tillage.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Nitrogen agronomic efficiency was greatest at 95 kg N ha −1 with no tillage.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- no‐tillagee0
- Outcome
- Nitrogen agronomic efficiencye0
- Direction
- greateste0
- Value
- 95 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen agronomic efficiency was greatest at 45 kg N ha −1 for the chisel method and 95 kg N ha −1 for disk and no‐tillage.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Tillage could increase yield even at relatively low nitrogen levels.
- Taxon
- Brassica carinataBrassica carinatat0
- Treatment
- Tillagee0
- Outcome
- yieldse0
- Qualifier
- even at relatively low N levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage has a greater potential to increase yields even at relatively low N levels.”
t0“rainfed Brassica carinata”
Claim · model-written summary
Tilled carinata at 45 kg N ha −1 yielded 8%–17% more seed than no tilled carinata at 135 kg N ha −1.
- Taxon
- carinataBrassica carinatae0
- Treatment
- tillede0
- Outcome
- seed yielde0
- Direction
- greatere0
- Value
- 8%–17%e0
- Qualifier
- 45 kg N ha −1e0
- Comparator
- no‐tilled carinatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When tilled, carinata produces 8%–17% greater seed yield at 45 kg N ha −1 than no‐tilled carinata grown with 135 kg N ha −1 .”
Claim · model-written summary
The authors recommend subsoil tillage and 90–135 kg N ha −1 for carinata on hardpan soils.
- Taxon
- carinataBrassica carinatae0
- Outcome
- tilling the subsoil and applying 90–135 kg N ha −1e0
- Qualifier
- soils with a hardpane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results indicate that tilling the subsoil and applying 90–135 kg N ha −1 are required for carinata production in soils with a hardpan.”
The same questions in other papers
tillage · yield · Brassica carinata (Ethiopian mustard)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
nitrogen · growth · Brassica carinata (Ethiopian mustard)Positive and negative results
4 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
2 papers more in this group
See all 6 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.