Abstract
The effectiveness, as a phosphate fertilizer, of granular reactive rock phosphate (carbonate substituted apatite from North Carolina, U.S.A.), granular triple superphosphate and partly powdered Duchess non-reactive rock phosphate (low carbonate apatite from north-eastern Australia) was compared in three field experiments on different soil types in different climatic regions of south-western Australia. Calciphos (finely ground calcined crandallite rock phosphate from Christmas Island) was included in one experiment. The rock phosphates were incorporated into the soil and their effectiveness was compared with both topdressed and incorporated superphosphate. Different species were grown at each site (barley, triticale and subterranean clover). As determined on the basis of relative amounts of fertilizer required for constant yield, the effectiveness of all the rock phosphates relative to incorporated superphosphate was very low at each site throughout the growth of each species. Fertilizer effectiveness of rock phosphates was about one-fifth that of superphosphate for barley, and one-tenth for triticale and clover. The maximum yield obtained from rock phosphate was generally 88-100% that obtained from superphosphate. Incorporation did not greatly affect the effectiveness of superphosphate.
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Claims 6
Claim · model-written summary
Rock phosphates had very low effectiveness relative to incorporated superphosphate for all three crops.
Verbatim
e0“the effectiveness of all the rock phosphates relative to incorporated superphosphate was very low at each site throughout the growth of each species”
Claim · model-written summary
Rock phosphates were about one-fifth as effective as superphosphate for barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- rock phosphatese0
- Outcome
- Fertilizer effectivenesse0
- Direction
- one-fifthe0
- Value
- one-fifthe0
- Comparator
- superphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Fertilizer effectiveness of rock phosphates was about one-fifth that of superphosphate for barley”
Claim · model-written summary
Rock phosphates were one-tenth as effective as superphosphate for triticale.
- Taxon
- triticale
×Triticosecalee0 - Treatment
- rock phosphatese0
- Outcome
- Fertilizer effectivenesse0
- Direction
- one-tenthe0
- Value
- one-tenthe0
- Comparator
- superphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer effectiveness of rock phosphates was about one-fifth that of superphosphate for barley, and one-tenth for triticale and clover”
Claim · model-written summary
Rock phosphates were one-tenth as effective as superphosphate for clover.
- Treatment
- rock phosphatese0
- Outcome
- Fertilizer effectivenesse0
- Direction
- one-tenthe0
- Value
- one-tenthe0
- Comparator
- superphosphatee0
TrifoliumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer effectiveness of rock phosphates was about one-fifth that of superphosphate for barley, and one-tenth for triticale and clover”
Claim · model-written summary
Maximum yield with rock phosphate was generally 88-100% of that with superphosphate.
- Taxon
- barley, triticale and subterranean clover
Trifolium subterraneumHordeum vulgare×Triticosecalet0 - Treatment
- rock phosphatee0
- Outcome
- maximum yielde0
- Direction
- 88-100%e0
- Value
- 88-100%e0
- Comparator
- superphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum yield obtained from rock phosphate was generally 88-100% that obtained from superphosphate”
t0“barley, triticale and subterranean clover”
Claim · model-written summary
Incorporation did not greatly change superphosphate effectiveness.
- Taxon
- barley, triticale and subterranean cloverTrifolium subterraneumHordeum vulgare×Triticosecalet0
- Treatment
- Incorporatione0
- Outcome
- effectiveness of superphosphatee0
- Direction
- did not greatly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Incorporation did not greatly affect the effectiveness of superphosphate”
t0“barley, triticale and subterranean clover”
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See all 9 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.