Abstract
ABSTRACT The experiment was carried out at an organic farm in 1996 and 1997. The purpose of the experiment was to test the effectiveness of basic slag (7% P) as a P fertilizer on an organic perennial ryegrass/white clover sward. Superphosphate (16% P) was used as a standard comparison. There was no difference between fresh weight or dry matter yields of grass or clover or of total herbage yields in plots treated with different rates of basic slag or superphosphate in the first harvest at the end of July 1996. In the second harvest, recorded at the end of August 1996, increasing rates of P gave increased yields. P source had no effect on herbage fresh weight or dry matter yield. P source and rate of P application had no effect on herbage yield in 1997. The percentage dry matter in herbage was unaffected by P source. Increasing rates of basic slag and superphosphate had no effect on the percentage dry matter in the herbage. There was no difference in the soil P concentrations obtained with basic slag or superphosphate when these were applied at equivalent rates. Increasing rates of P, when applied as basic slag or superphosphate at rates of 7, 14 and 28 kg ha−1, gave an increase in soil P concentration at 128 days after application. No increase was recorded at 531 days after application. Superphosphate gave the largest initial increase in herbage concentrations of P but was no more effective at raising the soil and herbage concentrations of this element than equivalent rates of basic slag over a two year period.
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Claims 11
Claim · model-written summary
First-harvest grass, clover and total herbage yields did not differ across basic slag and superphosphate rates.
- Taxon
- perennial ryegrass/white clover
Trifolium repens
Lolium perennee1 - Treatment
- different rates of basic slag or superphosphatee0
- Outcome
- fresh weight or dry matter yields of grass or clover or of total herbage yieldse0
- Direction
- no differencee0
- Qualifier
- first harvest at the end of July 1996e0
- Comparator
- different rates of basic slag or superphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference between fresh weight or dry matter yields of grass or clover or of total herbage yields in plots treated with different rates of basic slag or superphosphate in the first harvest at the end of July 1996”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Increasing phosphorus rates increased herbage yield in the second 1996 harvest.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- increasing rates of Pe0
- Outcome
- yieldse0
- Direction
- increasede0
- Qualifier
- second harvest, recorded at the end of August 1996e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the second harvest, recorded at the end of August 1996, increasing rates of P gave increased yields”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Phosphorus source did not affect herbage fresh or dry matter yield in the second harvest.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- P sourcee0
- Outcome
- herbage fresh weight or dry matter yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P source had no effect on herbage fresh weight or dry matter yield”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Phosphorus source and application rate did not affect 1997 herbage yield.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- P source and rate of P applicatione0
- Outcome
- herbage yielde0
- Direction
- no effecte0
- Qualifier
- 1997e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P source and rate of P application had no effect on herbage yield in 1997”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Phosphorus source did not affect herbage dry matter percentage.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- P sourcee0
- Outcome
- percentage dry matter in herbagee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage dry matter in herbage was unaffected by P source”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Increasing rates of either fertilizer did not affect herbage dry matter percentage.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- Increasing rates of basic slag and superphosphatee0
- Outcome
- percentage dry matter in the herbagee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing rates of basic slag and superphosphate had no effect on the percentage dry matter in the herbage”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
At equivalent rates, the fertilizers gave no difference in soil phosphorus concentration.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- basic slag or superphosphatee0
- Outcome
- soil P concentrationse0
- Direction
- no differencee0
- Comparator
- equivalent ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in the soil P concentrations obtained with basic slag or superphosphate when these were applied at equivalent rates”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Increasing phosphorus rates raised soil phosphorus concentration at 128 days.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- basic slag or superphosphate at rates of 7, 14 and 28 kg ha−1e0
- Outcome
- soil P concentratione0
- Direction
- increasee0
- Qualifier
- 128 days after applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing rates of P, when applied as basic slag or superphosphate at rates of 7, 14 and 28 kg ha−1, gave an increase in soil P concentration at 128 days after application”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
No increase in soil phosphorus concentration was recorded 531 days after application.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee2
- Treatment
- applicatione0
- Outcome
- soil P concentratione1
- Direction
- No increasee0
- Qualifier
- 531 days after applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No increase was recorded at 531 days after application”
e1“soil P concentration at 128 days after application”
e2“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Superphosphate gave the largest initial increase in herbage phosphorus concentration.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee1
- Treatment
- Superphosphatee0
- Outcome
- herbage concentrations of Pe0
- Direction
- largest initial increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superphosphate gave the largest initial increase in herbage concentrations of P”
e1“organic perennial ryegrass/white clover sward”
Claim · model-written summary
Over two years, superphosphate was no more effective than equivalent basic slag rates at raising soil and herbage phosphorus concentrations.
- Taxon
- perennial ryegrass/white cloverTrifolium repensLolium perennee2
- Treatment
- Superphosphatee1
- Outcome
- soil and herbage concentrations of this elemente0
- Direction
- no more effectivee0
- Qualifier
- over a two year periode0
- Comparator
- equivalent rates of basic slage0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was no more effective at raising the soil and herbage concentrations of this element than equivalent rates of basic slag over a two year period”
e1“Superphosphate gave the largest initial increase”
e2“organic perennial ryegrass/white clover sward”
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