Abstract
Wheat was grown for twelve successive years at three sites with five rates of nitrogen either as calcium ammonium nitrate, ammonium sulphate or urea applied each year to the same plots. There was a long term yield decline, with and without nitrogen, on the site at Wongan Hills, but not at Merredin or Beverley. At each of the three sites there was no indication of a need for higher rates of nitrogen fertilizers with time to maintain yields. At Wongan Hills and Merredin, yields were depressed in most years when the highest rate of ammonium sulphate was used each year. Grain protein contents were low and did not decrease with time.
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Claims 5
Claim · model-written summary
Wheat yield declined long term at Wongan Hills with and without nitrogen.
- Taxon
- Wheat
Triticum aestivume1 - Outcome
- yielde0
- Direction
- declinee0
- Qualifier
- with and without nitrogene0
- Setting
- Wongan Hillse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a long term yield decline, with and without nitrogen, on the site at Wongan Hills”
e1“Wheat was grown for twelve successive years”
Claim · model-written summary
Wheat yield did not decline long term at Merredin or Beverley.
- Taxon
- WheatTriticum aestivume2
- Outcome
- yield declinee1
- Direction
- note0
- Setting
- Merredin or Beverleye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not at Merredin or Beverley”
e1“There was a long term yield decline, with and without nitrogen, on the site at Wongan Hills, but not at Merredin or Beverley”
e2“Wheat was grown for twelve successive years”
Claim · model-written summary
Across the three sites, maintaining wheat yields did not require increasing nitrogen rates over time.
- Taxon
- WheatTriticum aestivume1
- Outcome
- need for higher rates of nitrogen fertilizerse0
- Direction
- no indicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At each of the three sites there was no indication of a need for higher rates of nitrogen fertilizers with time to maintain yields”
e1“Wheat was grown for twelve successive years”
Claim · model-written summary
The highest annual ammonium sulphate rate depressed wheat yields in most years at Wongan Hills and Merredin.
- Taxon
- WheatTriticum aestivume1
- Treatment
- highest rate of ammonium sulphatee0
- Outcome
- yieldse0
- Direction
- depressede0
- Qualifier
- in most yearse0
- Setting
- Wongan Hills and Merredine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Wongan Hills and Merredin, yields were depressed in most years when the highest rate of ammonium sulphate was used each year”
e1“Wheat was grown for twelve successive years”
Claim · model-written summary
Wheat grain protein contents were low and did not decrease with time.
- Taxon
- WheatTriticum aestivume1
- Outcome
- Grain protein contentse0
- Direction
- did not decreasee0
- Qualifier
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain protein contents were low and did not decrease with time”
e1“Wheat was grown for twelve successive years”
The same questions in other papers
ammonium sulfate · yield · Triticum aestivum (wheat)Results differ
4 papers in the same direction as this paper · 27 in the opposite direction
- positive
- positive
- positive
28 papers more in this group
See all 32 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.