Abstract
An experiment that was established in 1982 to assess placement of P fertilizer on the yield of continuous barley was terminated in 2004, after annual application of P (30 kg ha-1) was discontinued in all but one treatment in 2001. Total removal of P during the first 20 years of the experiment (615 kg P2O5 ha-1) was virtually equal to total P application (600 kg P2O5 ha-1); however, when removal by the control that was fertilized with N only was subtracted from the total removal, a residual P component of 474 kg P2O5 ha-1 was obtained as a result. In spite of this, discontinuing P fertilization after 20 years of annual application of 30 kg P2O5 ha-1 resulted in significant reduction in barley grain yield that was greater in the treatments that P was seedrow placed (21%) than either banded (12%) or 1/3 seedrow placed and 2/3 banded (15%). Four week burial of PRS™ probes in 2006 allowed us to ascertain the reasons for these differences that reflected management and P placement practices. The use of PRS™ probes allowed us to interpret over 90% of variations both in P removal and yield of barley over the duration of the experiment.
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Claims 6
Claim · model-written summary
Total P removal over 20 years was nearly equal to P application.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Outcome
- Total removal of Pe0
- Value
- 615 kg P2O5 ha-1e0
- Qualifier
- 600 kg P2O5 ha-1e0
- Comparator
- total P applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Total removal of P during the first 20 years of the experiment (615 kg P2O5 ha-1) was virtually equal to total P application (600 kg P2O5 ha-1)”
e1“yield of continuous barley”
Claim · model-written summary
Subtracting N-only control removal gave a residual P component of 474 kg P2O5 ha-1.
- Taxon
- barleyHordeum vulgaree2
- Outcome
- residual P componente0
- Value
- 474 kg P2O5 ha-1e0
- Comparator
- control that was fertilized with N onlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a residual P component of 474 kg P2O5 ha-1 was obtained as a result”
e1“control that was fertilized with N only”
e2“yield of continuous barley”
Claim · model-written summary
Stopping P fertilizer reduced barley grain yield by 21% with seedrow placed placement.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- discontinuing P fertilizatione0
- Outcome
- barley grain yielde0
- Direction
- reductione0
- Value
- 21%e0
- Qualifier
- seedrow placede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“discontinuing P fertilization after 20 years of annual application of 30 kg P2O5 ha-1 resulted in significant reduction in barley grain yield that was greater in the treatments that P was seedrow placed (21%) than either banded (12%) or 1/3 seedrow placed and 2/3 banded (15%)”
Claim · model-written summary
Stopping P fertilizer reduced barley grain yield by 12% with banded placement.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- discontinuing P fertilizatione0
- Outcome
- barley grain yielde0
- Direction
- reductione0
- Value
- 12%e0
- Qualifier
- bandede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“discontinuing P fertilization after 20 years of annual application of 30 kg P2O5 ha-1 resulted in significant reduction in barley grain yield that was greater in the treatments that P was seedrow placed (21%) than either banded (12%) or 1/3 seedrow placed and 2/3 banded (15%)”
Claim · model-written summary
Stopping P fertilizer reduced barley grain yield by 15% with 1/3 seedrow placed and 2/3 banded placement.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- discontinuing P fertilizatione0
- Outcome
- barley grain yielde0
- Direction
- reductione0
- Value
- 15%e0
- Qualifier
- 1/3 seedrow placed and 2/3 bandede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“discontinuing P fertilization after 20 years of annual application of 30 kg P2O5 ha-1 resulted in significant reduction in barley grain yield that was greater in the treatments that P was seedrow placed (21%) than either banded (12%) or 1/3 seedrow placed and 2/3 banded (15%)”
Claim · model-written summary
PRS probes accounted for more than 90% of variation in P removal and barley yield.
- Taxon
- barleyHordeum vulgaree0
- Outcome
- variations both in P removal and yield of barleye0
- Value
- over 90%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of PRS™ probes allowed us to interpret over 90% of variations both in P removal and yield of barley over the duration of the experiment”
The same questions in other papers
fertilization · yield · Hordeum vulgare (barley)Positive and negative results
76 papers in the same direction as this paper · 473 in the opposite direction
- positive
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See all 550 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.