Abstract
The effect of N fertiliser on pasture yields and species composition, and spring stock carrying capacity was measured undergrazing at Ballantrae, the Grasslands Division hill country area. N fertiliser was applied as urea in early spring at rates up to 100 kg N/ha. Paddocks were set stocked with sheep with additional sheep being added to N fertilised paddocks to maintain similar herbage availabilities. N fertiliser increased pasture growth by an average of 7 kg DM/ kg N applied. Stock carrying capacities over spring ranged from 18 sheep/ ha without N, to 26 sheep/ ha with 100 kg N/ha. The major species composition effects of N was a reduction in clover yields and clover nitrogen fixation rates, in the spring, summer and autumn after the spring application. Clover growth and N fixation decreased most over summer when clover yields and nitrogen fixation were 41% and 52% lower respectively on hill slopes, at the highest rate of N fertiliser. Pasture yields were lower in autumn on pastures previously N fertilised.
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Claims 7
Claim · model-written summary
Nitrogen fertilizer increased pasture growth by an average of 7 kg DM per kg N applied.
- Taxon
- pasturee0
- Treatment
- N fertilisere0
- Outcome
- pasture growthe0
- Direction
- increasede0
- Value
- 7 kg DM/ kg N appliede0
Not reportedComparator
Verbatim
e0“N fertiliser increased pasture growth by an average of 7 kg DM/ kg N applied.”
Claim · model-written summary
Spring stock carrying capacity rose from 18 to 26 sheep per hectare at 100 kg N/ha.
- Taxon
- pasturest0
- Treatment
- 100 kg N/hae0
- Outcome
- Stock carrying capacitiese0
- Value
- 26 sheep/ hae0
- Qualifier
- 18 sheep/ hae0
- Comparator
- without Ne0
Not reportedDirection
Verbatim
e0“Stock carrying capacities over spring ranged from 18 sheep/ ha without N, to 26 sheep/ ha with 100 kg N/ha.”
t0“PASTURES”
Claim · model-written summary
Nitrogen fertilizer reduced clover yields in spring, summer and autumn.
TrifoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The major species composition effects of N was a reduction in clover yields and clover nitrogen fixation rates, in the spring, summer and autumn after the spring application.”
Claim · model-written summary
Nitrogen fertilizer reduced clover nitrogen fixation in spring, summer and autumn.
- Treatment
- Ne0
- Outcome
- clover nitrogen fixation ratese0
- Direction
- reductione0
- Qualifier
- spring, summer and autumne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The major species composition effects of N was a reduction in clover yields and clover nitrogen fixation rates, in the spring, summer and autumn after the spring application.”
Claim · model-written summary
At the highest fertilizer rate, summer clover yield on hill slopes was 41% lower.
- Treatment
- highest rate of N fertilisere0
- Outcome
- clover yieldse0
- Direction
- lowere0
- Value
- 41%e0
- Setting
- hill slopese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clover growth and N fixation decreased most over summer when clover yields and nitrogen fixation were 41% and 52% lower respectively on hill slopes, at the highest rate of N fertiliser.”
Claim · model-written summary
At the highest fertilizer rate, summer clover nitrogen fixation on hill slopes was 52% lower.
- Treatment
- highest rate of N fertilisere0
- Outcome
- nitrogen fixatione0
- Direction
- lowere0
- Value
- 52%e0
- Setting
- hill slopese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clover growth and N fixation decreased most over summer when clover yields and nitrogen fixation were 41% and 52% lower respectively on hill slopes, at the highest rate of N fertiliser.”
Claim · model-written summary
Pasture yields were lower in autumn after nitrogen fertilization.
- Taxon
- pasturese0
- Treatment
- previously N fertilisede0
- Outcome
- Pasture yieldse0
- Direction
- lowere0
- Qualifier
- autumne0
Not reportedComparator
Verbatim
e0“Pasture yields were lower in autumn on pastures previously N fertilised.”
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