Abstract
The development of an intermittently grazed phalaris-white clover pasture was studied from 1967 to 1970 following factorial annual applications of nitrogen fertilizer (0, 56, 11 2 kg N ha-1) and superphosphate (0, 188, 375 kg ha-1) onto a previously unfertilized site near Armidale, New South Wales. Each year superphosphate increased annual yields of phalaris, clover and total pasture. The response to superphosphate of phalaris was mainly linear, but in the final year of the experiment the yield of clover was greater at the intermediate rate (SP188) than at SP375. Nitrogen increased annual dry matter yields of phalaris and total pasture only in the presence of superphosphate. Clover growth was not suppressed by nitrogen fertilizer until the final year, when total pasture yields were not increased by nitrogen. In the absence of applied nitrogen, pastures on the SP375 treatment were clover-dominant in 1967 and 1968 but strongly grass-dominant in 1970; at SP188, pastures remained clover-dominant after the establishment year. The application of up to 112 kg N ha-1 year -1 reduced the intensity of the clover-dominant phase at SP, and circumvented clover-dominance at SP188. Grass-white clover relationships during pasture development are discussed in relation to the prevention of cattle bloat.
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Claims 13
Claim · model-written summary
Superphosphate increased annual phalaris yield each year.
PhalarisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Each year superphosphate increased annual yields of phalaris, clover and total pasture.”
Claim · model-written summary
Superphosphate increased annual clover yield each year.
TrifoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Each year superphosphate increased annual yields of phalaris, clover and total pasture.”
Claim · model-written summary
Superphosphate increased annual total pasture yield each year.
Not reportedComparator
Verbatim
e0“Each year superphosphate increased annual yields of phalaris, clover and total pasture.”
Claim · model-written summary
Phalaris yield response to superphosphate was mainly linear.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response to superphosphate of phalaris was mainly linear”
Claim · model-written summary
In the final year, clover yield at SP188 exceeded SP375.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the final year of the experiment the yield of clover was greater at the intermediate rate (SP188) than at SP375”
Claim · model-written summary
Nitrogen increased phalaris annual dry matter yield only with superphosphate.
- Treatment
- Nitrogene0
- Outcome
- annual dry matter yields of phalarise0
- Direction
- increasede0
- Qualifier
- only in the presence of superphosphatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen increased annual dry matter yields of phalaris and total pasture only in the presence of superphosphate.”
Claim · model-written summary
Nitrogen increased total pasture annual dry matter yield only with superphosphate.
- Taxon
- pasturee0
- Treatment
- Nitrogene0
- Outcome
- total pasturee0
- Direction
- increasede0
- Qualifier
- only in the presence of superphosphatee0
Not reportedComparator
Verbatim
e0“Nitrogen increased annual dry matter yields of phalaris and total pasture only in the presence of superphosphate.”
Claim · model-written summary
Nitrogen suppressed clover growth only in the final year.
- Treatment
- nitrogen fertilizere0
- Outcome
- Clover growthe0
- Direction
- suppressede0
- Qualifier
- until the final yeare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clover growth was not suppressed by nitrogen fertilizer until the final year”
Claim · model-written summary
Nitrogen did not increase total pasture yield in the final year.
Not reportedComparator
Verbatim
e0“when total pasture yields were not increased by nitrogen”
Claim · model-written summary
Without nitrogen, SP375 pasture shifted from clover dominance in 1967–68 to grass dominance in 1970.
Verbatim
e0“In the absence of applied nitrogen, pastures on the SP375 treatment were clover-dominant in 1967 and 1968 but strongly grass-dominant in 1970”
Claim · model-written summary
At SP188, pasture remained clover dominant after establishment.
Verbatim
e0“at SP188, pastures remained clover-dominant after the establishment year”
Claim · model-written summary
Nitrogen reduced clover dominance at the higher superphosphate rate.
- Treatment
- up to 112 kg N ha-1 year -1e0
- Outcome
- intensity of the clover-dominant phasee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of up to 112 kg N ha-1 year -1 reduced the intensity of the clover-dominant phase at SP”
Claim · model-written summary
Nitrogen prevented clover dominance at SP188.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“circumvented clover-dominance at SP188”
e1“The application of up to 112 kg N ha-1 year -1 reduced”
The same questions in other papers
phosphorus · yield · PhalarisPositive and negative results
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fertilization · growth · TrifoliumPositive and negative results
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See all 13 papers →phosphorus · yield · TrifoliumPositive and negative results
12 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
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See all 16 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.