Abstract
Abstract The effect of N ‐( n ‐butyl) thiophosphoric triamide (nBTPT)‐amended urea on herbage dry‐matter yield and nitrogen offtake by perennial ryegrass ( Lolium perenne ) was studied in fifteen grassland experiments at two sites in Northern Ireland between 1994 and 1996. The dry‐matter yield and N offtake with applied urea was only significantly lower than that with applied calcium ammonium nitrate (CAN) on four occasions. On these occasions nBTPT increased the yield from the application of urea making it almost as effective as CAN. There was no evidence of any adverse effect on grass production with repeated applications of nBTPT‐amended urea over a 3‐year period and no indication that its efficacy to reduce NH 3 , loss from ureatreated swards declined when used repeatedly on the same soil.
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Claims 5
Claim · model-written summary
Urea gave significantly lower dry matter yield than calcium ammonium nitrate on four occasions.
- Taxon
- Lolium perenne
Lolium perennee1 - Treatment
- applied ureae0
- Outcome
- dry‐matter yielde0
- Direction
- lowere0
- Qualifier
- on four occasionse0
- Comparator
- applied calcium ammonium nitrate (CAN)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dry‐matter yield and N offtake with applied urea was only significantly lower than that with applied calcium ammonium nitrate (CAN) on four occasions”
e1“perennial ryegrass ( Lolium perenne )”
Claim · model-written summary
Urea gave significantly lower nitrogen offtake than calcium ammonium nitrate on four occasions.
- Taxon
- Lolium perenneLolium perennee1
- Treatment
- applied ureae0
- Outcome
- N offtakee0
- Direction
- lowere0
- Qualifier
- on four occasionse0
- Comparator
- applied calcium ammonium nitrate (CAN)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dry‐matter yield and N offtake with applied urea was only significantly lower than that with applied calcium ammonium nitrate (CAN) on four occasions”
e1“perennial ryegrass ( Lolium perenne )”
Claim · model-written summary
nBTPT increased yield from urea to nearly the calcium ammonium nitrate level on those occasions.
- Taxon
- Lolium perenneLolium perennee1
- Treatment
- nBTPTe0
- Outcome
- yielde0
- Direction
- increasede0
- Comparator
- CANe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On these occasions nBTPT increased the yield from the application of urea making it almost as effective as CAN”
e1“perennial ryegrass ( Lolium perenne )”
Claim · model-written summary
Repeated nBTPT-amended urea showed no adverse grass production effect over three years.
- Taxon
- Lolium perenneLolium perennee1
- Treatment
- repeated applications of nBTPT‐amended ureae0
- Outcome
- grass productione0
- Direction
- no evidence of any adverse effecte0
- Qualifier
- over a 3‐year periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no evidence of any adverse effect on grass production with repeated applications of nBTPT‐amended urea over a 3‐year period”
e1“perennial ryegrass ( Lolium perenne )”
Claim · model-written summary
Repeated use on the same soil showed no decline in efficacy against ammonia loss.
- Taxon
- Lolium perenneLolium perennee1
- Outcome
- efficacy to reduce NH 3 , loss from ureatreated swardse0
- Direction
- no indication that its efficacy to reduce NH 3 , loss from ureatreated swards declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no indication that its efficacy to reduce NH 3 , loss from ureatreated swards declined when used repeatedly on the same soil”
e1“perennial ryegrass ( Lolium perenne )”
The same questions in other papers
nitrogen · yield · Lolium perenne (perennial ryegrass)Results differ
14 papers in the same direction as this paper · 44 in the opposite direction
- positive
- positive
- positive
55 papers more in this group
See all 59 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.