Abstract
Monocalcium phosphate was broadcast at 0, 50, 100, and 200 kg P/ha to a calcareous soil, very low in NaHCO 3 -extractable P. Wheat (Triticum aestivum cv. Selkirk) and flax (Linum usitatissimum cv. Marine) were seeded in the 1st yr and barley (Hordeum vulgare cv. Montcalm) and flax were alternated in 3 subsequent yr. Subplot treatments consisted of 0, 5, 10, 20 and 40 kg P/ha applied as monoammonium phosphate with the seed. Wheat and barley responded well to broadcast or seed-drilled P. The latter was the most effective method of application; this was apparent even on plots receiving large amounts of broadcast P. In contrast, flax was not responsive to newly applied P, and yields decreased with application of seed-drilled P in combination with large amounts broadcast. The solubility of P in the untreated soil was between that of octacalcium phosphate (OCP) and hydroxyapatite (HA). The solubility of P in the treated soils was greater than in the untreated soils for the duration of the sampling period (3 yr) and was slightly less than that of OCP for the 50 kg/ha treatments, about that of OCP for the 100 kg P/ha treatment and greater than that of OCP for the 200 kg P/ha treatment. These studies indicate that the reaction product most likely governing the solution concentration of P was OCP.
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Claims 13
Claim · model-written summary
Wheat responded well to broadcast phosphorus.
- Taxon
- Wheat
Triticum aestivume0 - Treatment
- broadcaste0
- Outcome
- responded welle0
- Direction
- responded welle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat and barley responded well to broadcast or seed-drilled P”
Claim · model-written summary
Wheat responded well to seed-drilled phosphorus.
- Taxon
- WheatTriticum aestivume0
- Treatment
- seed-drilled Pe0
- Outcome
- responded welle0
- Direction
- responded welle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat and barley responded well to broadcast or seed-drilled P”
Claim · model-written summary
Barley responded well to broadcast phosphorus.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- broadcaste0
- Outcome
- responded welle0
- Direction
- responded welle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Wheat and barley responded well to broadcast or seed-drilled P”
Claim · model-written summary
Barley responded well to seed-drilled phosphorus.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- seed-drilled Pe0
- Outcome
- responded welle0
- Direction
- responded welle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat and barley responded well to broadcast or seed-drilled P”
Claim · model-written summary
Seed-drilled phosphorus was the most effective placement, including where broadcast phosphorus was high.
- Taxon
- WheatTriticum aestivume1
- Treatment
- seed-drilled Pe1
- Outcome
- most effective method of applicatione0
- Direction
- most effectivee0
- Qualifier
- even on plots receiving large amounts of broadcast Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The latter was the most effective method of application; this was apparent even on plots receiving large amounts of broadcast P”
e1“Wheat and barley responded well to broadcast or seed-drilled P”
Claim · model-written summary
Flax did not respond to newly applied phosphorus.
- Taxon
- flax
Linum usitatissimume0 - Treatment
- newly applied Pe0
- Outcome
- responsivee0
- Direction
- not responsivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“flax was not responsive to newly applied P”
Claim · model-written summary
Flax yield fell with seed-drilled phosphorus combined with large broadcast applications.
- Taxon
- flaxLinum usitatissimume0
- Treatment
- application of seed-drilled P in combination with large amounts broadcaste0
- Outcome
- yieldse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“flax was not responsive to newly applied P, and yields decreased with application of seed-drilled P in combination with large amounts broadcast”
Claim · model-written summary
Untreated-soil phosphorus solubility lay between octacalcium phosphate and hydroxyapatite.
- Outcome
- solubility of P in the untreated soile0
- Comparator
- octacalcium phosphate (OCP) and hydroxyapatite (HA)e0
Not reportedTaxonDirection
Verbatim
e0“The solubility of P in the untreated soil was between that of octacalcium phosphate (OCP) and hydroxyapatite (HA)”
Claim · model-written summary
Treated-soil phosphorus solubility exceeded untreated soil throughout three years.
- Outcome
- solubility of P in the treated soilse0
- Direction
- greatere0
- Qualifier
- 3 yre0
- Comparator
- untreated soilse0
Not reportedTaxon
Verbatim
e0“The solubility of P in the treated soils was greater than in the untreated soils for the duration of the sampling period (3 yr)”
Claim · model-written summary
The 50 kg/ha treatment had soil P solubility slightly below octacalcium phosphate.
Not reportedTaxon
Verbatim
e0“slightly less than that of OCP for the 50 kg/ha treatments”
Claim · model-written summary
The 100 kg P/ha treatment had soil P solubility about that of octacalcium phosphate.
Not reportedTaxonDirection
Verbatim
e0“about that of OCP for the 100 kg P/ha treatment”
Claim · model-written summary
The 200 kg P/ha treatment had soil P solubility above octacalcium phosphate.
Not reportedTaxon
Verbatim
e0“greater than that of OCP for the 200 kg P/ha treatment”
Claim · model-written summary
The authors infer that octacalcium phosphate likely governed solution P concentration.
Not reportedTaxon
Verbatim
e0“the reaction product most likely governing the solution concentration of P was OCP”
The same questions in other papers
transplanting · yield · Linum usitatissimum (flax)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- no effect
- positive
- positive
3 papers more in this group
See all 7 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.