Abstract
The response of oilseed rape to applied nitrogen and phosphorus was investigated in 2 areas of the South East of South Australia. The nitrogen rates applied varied from 0 to 50 kg/ha, while phosphorus rates applied in the Mundulla area ranged from 0 to 20 kg/ha and 0 to 34 kg/ha in the Millicent area. At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites and by applied phosphorus at 2 sites. On heavy black clay and peat soils in the Millicent area, oilseed rape yields were increased significantly by applied nitrogen at 5 of the 12 sites and by applied phosphorus at 6 sites. Of the measured soil variables, anaerobic ammonium nitrogen measured in the top 10 cm best predicted responses in seed yield to applied nitrogen. The critical nutrient range was 45-65 mg/kg. The response of oilseed rape to applied nitrogen was highly correlated with past paddock use but varied between the 2 areas. From the prediction equations developed, it was concluded that, in the Mundulla area, a significant (P< 0.05) nitrogen response was likely if the oilseed rape followed 2 or more crops, the last a non-legume, but was unlikely if the oilseed rape followed 1 or more years of pasture. At Millicent, a nitrogen response was likely if the oilseed rape was grown as the sixth crop in a continuous cropping program, and was unlikely if it was the first or second crop in the rotation, provided the preceding crop was a non-legume. The response of oilseed rape to applied phosphorus was highly correlated to extractable soil phosphorus measured in the top 10 cm (Colwell). The critical nutrient range was 20-25 mg/kg for the sandy loam soils at Mundulla and 40-50 mg/kg for the black clay and peat soils at Millicent. Nitrogen applications significantly increased seed oil content at 6 sites, significantly decreased it at 2 sites and had no effect at 13 sites. Phosphorus significantly increased seed oil content at only 1 site, significantly decreased it at 3 sites, and had no effect at the other 17 sites.
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Claims 20
Claim · model-written summary
Applied nitrogen significantly increased oilseed rape yields at 7 of 9 sites in the Mundulla area.
- Taxon
- oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse1 - Treatment
- applied nitrogene1
- Outcome
- oilseed rape yieldse1
- Direction
- increasede1
- Value
- 7 sitese1
- Setting
- Mundulla areae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
Claim · model-written summary
Applied phosphorus significantly increased oilseed rape yields at 2 sites in the Mundulla area.
- Taxon
- oilseed rapeBrassica napuse1
- Treatment
- applied phosphoruse2
- Outcome
- oilseed rape yieldse2
- Direction
- increasede2
- Value
- 2 sitese2
- Setting
- Mundulla areae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“oilseed rape yields were increased significantly by applied nitrogen at 7 sites and by applied phosphorus at 2 sites”
Claim · model-written summary
Applied nitrogen significantly increased oilseed rape yields at 5 of the 12 sites on heavy black clay and peat soils at Millicent.
- Taxon
- oilseed rapeBrassica napuse3
- Treatment
- applied nitrogene3
- Outcome
- oilseed rape yieldse3
- Direction
- increasede3
- Value
- 5 of the 12 sitese3
- Setting
- heavy black clay and peat soils in the Millicent areae3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“On heavy black clay and peat soils in the Millicent area, oilseed rape yields were increased significantly by applied nitrogen at 5 of the 12 sites and by applied phosphorus at 6 sites”
Claim · model-written summary
Applied phosphorus significantly increased oilseed rape yields at 6 sites on heavy black clay and peat soils at Millicent.
- Taxon
- oilseed rapeBrassica napuse3
- Treatment
- applied phosphoruse3
- Outcome
- oilseed rape yieldse3
- Direction
- increasede3
- Value
- 6 sitese3
- Setting
- heavy black clay and peat soils in the Millicent areae3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“On heavy black clay and peat soils in the Millicent area, oilseed rape yields were increased significantly by applied nitrogen at 5 of the 12 sites and by applied phosphorus at 6 sites”
Claim · model-written summary
Anaerobic ammonium nitrogen measured in the top 10 cm best predicted seed yield responses to applied nitrogen among the measured soil variables.
- Taxon
- oilseed rapeBrassica napuse1
- Compound
- anaerobic ammonium nitrogene4
- Outcome
- responses in seed yield to applied nitrogene4
- Comparator
- measured soil variablese4
- Setting
- top 10 cme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e4“Of the measured soil variables, anaerobic ammonium nitrogen measured in the top 10 cm best predicted responses in seed yield to applied nitrogen”
Claim · model-written summary
The critical nutrient range for the soil variable tested was 45-65 mg/kg for oilseed rape responses.
- Taxon
- oilseed rapeBrassica napuse1
- Outcome
- critical nutrient rangee5
- Value
- 45-65 mg/kge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e5“The critical nutrient range was 45-65 mg/kg”
Claim · model-written summary
The response of oilseed rape to applied nitrogen was highly correlated with past paddock use.
- Taxon
- oilseed rapeBrassica napuse6
- Treatment
- applied nitrogene6
- Outcome
- response of oilseed rape to applied nitrogene6
- Setting
- past paddock usee6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The response of oilseed rape to applied nitrogen was highly correlated with past paddock use but varied between the 2 areas”
Claim · model-written summary
In the Mundulla area a significant nitrogen response was likely when oilseed rape followed 2 or more crops, the last a non-legume.
- Taxon
- oilseed rapeBrassica napuse7
- Treatment
- followed 2 or more crops, the last a non-legumee7
- Outcome
- nitrogen responsee7
- Setting
- Mundulla areae7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“in the Mundulla area, a significant (P< 0.05) nitrogen response was likely if the oilseed rape followed 2 or more crops, the last a non-legume”
Claim · model-written summary
In the Mundulla area a nitrogen response was unlikely when oilseed rape followed 1 or more years of pasture.
- Taxon
- oilseed rapeBrassica napuse7
- Treatment
- followed 1 or more years of pasturee2
- Outcome
- nitrogen responsee7
- Setting
- Mundulla areae7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“in the Mundulla area, a significant (P< 0.05) nitrogen response was likely if the oilseed rape followed 2 or more crops, the last a non-legume”
e2“but was unlikely if the oilseed rape followed 1 or more years of pasture”
Claim · model-written summary
At Millicent a nitrogen response was likely when oilseed rape was the sixth crop in a continuous cropping program.
- Taxon
- oilseed rapeBrassica napuse0
- Treatment
- sixth crop in a continuous cropping programe0
- Outcome
- nitrogen responsee0
- Setting
- Millicente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Millicent, a nitrogen response was likely if the oilseed rape was grown as the sixth crop in a continuous cropping program”
Claim · model-written summary
At Millicent a nitrogen response was unlikely when oilseed rape was the first or second crop in the rotation.
- Taxon
- oilseed rapeBrassica napuse0
- Treatment
- first or second crop in the rotatione1
- Outcome
- nitrogen responsee0
- Setting
- Millicente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Millicent, a nitrogen response was likely if the oilseed rape was grown as the sixth crop in a continuous cropping program”
e1“and was unlikely if it was the first or second crop in the rotation”
Claim · model-written summary
The response of oilseed rape to applied phosphorus was highly correlated with extractable soil phosphorus measured in the top 10 cm.
- Taxon
- oilseed rapeBrassica napuse0
- Treatment
- applied phosphoruse0
- Compound
- extractable soil phosphoruse0
- Outcome
- response of oilseed rape to applied phosphoruse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of oilseed rape to applied phosphorus was highly correlated to extractable soil phosphorus measured in the top 10 cm (Colwell)”
Claim · model-written summary
The critical nutrient range was 20-25 mg/kg for sandy loam soils at Mundulla.
- Taxon
- oilseed rapeBrassica napuse1
- Outcome
- critical nutrient rangee2
- Value
- 20-25 mg/kge2
- Setting
- sandy loam soils at Mundullae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“The critical nutrient range was 20-25 mg/kg for the sandy loam soils at Mundulla and 40-50 mg/kg for the black clay and peat soils at Millicent”
Claim · model-written summary
The critical nutrient range was 40-50 mg/kg for black clay and peat soils at Millicent.
- Taxon
- oilseed rapeBrassica napuse1
- Outcome
- critical nutrient rangee2
- Value
- 40-50 mg/kge2
- Setting
- black clay and peat soils at Millicente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“The critical nutrient range was 20-25 mg/kg for the sandy loam soils at Mundulla and 40-50 mg/kg for the black clay and peat soils at Millicent”
Claim · model-written summary
Nitrogen applications significantly increased seed oil content of oilseed rape at 6 sites.
- Taxon
- oilseed rapeBrassica napuse1
- Treatment
- Nitrogen applicationse2
- Outcome
- seed oil contente2
- Direction
- increasede2
- Value
- 6 sitese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“Nitrogen applications significantly increased seed oil content at 6 sites, significantly decreased it at 2 sites and had no effect at 13 sites”
Claim · model-written summary
Nitrogen applications significantly decreased seed oil content of oilseed rape at 2 sites.
- Taxon
- oilseed rapeBrassica napuse1
- Treatment
- Nitrogen applicationse2
- Outcome
- seed oil contente2
- Direction
- decreasede2
- Value
- 2 sitese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“Nitrogen applications significantly increased seed oil content at 6 sites, significantly decreased it at 2 sites and had no effect at 13 sites”
Claim · model-written summary
Nitrogen applications had no effect on seed oil content of oilseed rape at 13 sites.
- Taxon
- oilseed rapeBrassica napuse1
- Treatment
- Nitrogen applicationse2
- Outcome
- seed oil contente2
- Direction
- had no effecte2
- Value
- 13 sitese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“Nitrogen applications significantly increased seed oil content at 6 sites, significantly decreased it at 2 sites and had no effect at 13 sites”
Claim · model-written summary
Phosphorus significantly increased seed oil content of oilseed rape at only 1 site.
- Taxon
- oilseed rapeBrassica napuse1
- Treatment
- Phosphoruse2
- Outcome
- seed oil contente2
- Direction
- increasede2
- Value
- 1 sitee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“Phosphorus significantly increased seed oil content at only 1 site, significantly decreased it at 3 sites, and had no effect at the other 17 sites”
Claim · model-written summary
Phosphorus significantly decreased seed oil content of oilseed rape at 3 sites.
- Taxon
- oilseed rapeBrassica napuse1
- Treatment
- Phosphoruse2
- Outcome
- seed oil contente2
- Direction
- decreasede2
- Value
- 3 sitese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“Phosphorus significantly increased seed oil content at only 1 site, significantly decreased it at 3 sites, and had no effect at the other 17 sites”
Claim · model-written summary
Phosphorus had no effect on seed oil content of oilseed rape at 17 sites.
- Taxon
- oilseed rapeBrassica napuse1
- Treatment
- Phosphoruse2
- Outcome
- seed oil contente2
- Direction
- had no effecte2
- Value
- 17 sitese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“At 9 sites in the Mundulla area, where soils were primarily sandy loam over clay, oilseed rape yields were increased significantly by applied nitrogen at 7 sites”
e2“Phosphorus significantly increased seed oil content at only 1 site, significantly decreased it at 3 sites, and had no effect at the other 17 sites”
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See all 239 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.