Abstract
The response of perennial ryegrass and white clover to fertiliser N rates of 0, 30, 60, 120 and 180 kg N ha−1 when grown at soil water potentials of-10, −20, −25 and −35 kPa were investigated. Increasing fertiliser N levels from 0 to 120 kg N ha−1 resulted in increased (P=0.05) perennial ryegrass primary dry matter production (PDM) at the end of the first regrowth cycle (31 days). Ryegrass PDM yield was influenced (P=0.05) by soil water potential, with higher yields recorded at the −10 and −20 kPa treatments compared to the −25 and −35 kPa treatments. White clover PDM production was not influenced by N rate or soil water potential. Carry-over fertiliser N caused increased (P=0.05) ryegrass residual dry matter (RDM) yields as fertiliser N rate was increased from 0, 30, or 60 kg N ha−1 to 120 and 180 kg N ha−1, while clover RDM production increased as fertiliser N rate was increased from 0 to 180 kg N ha−1. Higher (-10 and −20 kPa) soil water levels caused increased ryegrass RDM production, a response not observed in clover. Total dry matter (TDM) production (the accumulative dry matter production during a 60 day period following fertiliser N application) of ryegrass was significantly increased as fertiliser N rate was increased from 0 to 180 kg N ha−1. Higher ryegrass TDM yields at −10 kPa and −20 kPa were recorded at the higher (120 and 180 kg N ha−1) N application rates, but water content did not influence TDM production at the lower (0, 30 and 60 kg N ha−1) fertiliser N application rates. Clover TDM production was not influenced by the treatments applied.
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Claims 11
Claim · model-written summary
Nitrogen from 0 to 120 kg N ha−1 increased ryegrass primary dry matter production.
- Taxon
- perennial ryegrass
Lolium perennee0 - Treatment
- fertiliser N levels from 0 to 120 kg N ha−1e0
- Outcome
- primary dry matter productione0
- Direction
- increasede0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing fertiliser N levels from 0 to 120 kg N ha−1 resulted in increased (P=0.05) perennial ryegrass primary dry matter production (PDM)”
Claim · model-written summary
Ryegrass primary dry matter yield was higher at −10 and −20 kPa than at −25 and −35 kPa.
- Treatment
- −10 and −20 kPa treatmentse0
- Outcome
- PDM yielde0
- Direction
- highere0
- Comparator
- −25 and −35 kPa treatmentse0
LoliumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ryegrass PDM yield was influenced (P=0.05) by soil water potential, with higher yields recorded at the −10 and −20 kPa treatments compared to the −25 and −35 kPa treatments.”
Claim · model-written summary
White clover primary dry matter production did not respond to nitrogen rate or soil water potential.
- Taxon
- White clover
Trifolium repense0 - Treatment
- N rate or soil water potentiale0
- Outcome
- PDM productione0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“White clover PDM production was not influenced by N rate or soil water potential.”
Claim · model-written summary
Carry-over nitrogen increased ryegrass residual dry matter yield at 120 and 180 relative to lower rates.
- Treatment
- 120 and 180 kg N ha−1e0
- Outcome
- residual dry matter (RDM) yieldse0
- Direction
- increasede0
- Comparator
- 0, 30, or 60 kg N ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carry-over fertiliser N caused increased (P=0.05) ryegrass residual dry matter (RDM) yields as fertiliser N rate was increased from 0, 30, or 60 kg N ha−1 to 120 and 180 kg N ha−1”
Claim · model-written summary
Nitrogen increasing from 0 to 180 kg N ha−1 increased clover residual dry matter.
- Treatment
- fertiliser N rate was increased from 0 to 180 kg N ha−1e0
- Outcome
- RDM productione0
- Direction
- increasede0
- Comparator
- 0e0
TrifoliumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“clover RDM production increased as fertiliser N rate was increased from 0 to 180 kg N ha−1”
Claim · model-written summary
Higher soil water levels increased ryegrass residual dry matter production.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher (-10 and −20 kPa) soil water levels caused increased ryegrass RDM production”
Claim · model-written summary
Higher soil water levels did not increase clover residual dry matter production.
- Outcome
- response not observede0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a response not observed in clover”
Claim · model-written summary
Increasing nitrogen from 0 to 180 kg N ha−1 significantly increased ryegrass total dry matter.
- Treatment
- fertiliser N rate was increased from 0 to 180 kg N ha−1e0
- Outcome
- Total dry matter (TDM) productione0
- Direction
- increasede0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total dry matter (TDM) production (the accumulative dry matter production during a 60 day period following fertiliser N application) of ryegrass was significantly increased as fertiliser N rate was increased from 0 to 180 kg N ha−1.”
Claim · model-written summary
At high nitrogen rates ryegrass total dry matter was higher at −10 and −20 kPa.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher ryegrass TDM yields at −10 kPa and −20 kPa were recorded at the higher (120 and 180 kg N ha−1) N application rates”
Claim · model-written summary
At lower nitrogen rates water content did not influence ryegrass total dry matter.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- water contente0
- Outcome
- TDM productione0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water content did not influence TDM production at the lower (0, 30 and 60 kg N ha−1) fertiliser N application rates”
t0“perennial ryegrass”
Claim · model-written summary
Applied treatments did not influence clover total dry matter production.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clover TDM production was not influenced by the treatments applied.”
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See all 40 papers →8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.