Abstract
Available P was measured in topsoil from nine fields by resin, Olsen, Bray 1 and Bray 2 methods. Seven soybean and five cowpea genotypes and maize were grown in a greenhouse with a P-deficient soil, with and without calcium phosphate, aluminium phosphate, iron phosphate, and triple superphosphate. Resin-P varied from 0.7 to 6.9 mg kg-1 and was less than 5% of total P in all soils. Olsen-P ranged between 0.8 and 8 mg kg-1 while Bray 1 P varied from 2 to 20 mg kg-1. Bray 2 P had a mean of 9 mg kg-1 and was within the same range as Bray 1 P. The lowest total dry matter yield was under Al-P. On average, growth under Ca-P and TSP were similar. Data on P uptake efficiency suggest that cowpea IT89KD-391 grew better than other genotypes in Ca-P amended soil; the results of cowpea IT90K-59 under Fe P, Ca-P, and TSP were similar. Differences in growth might be attributed to differing ability to acquire P from sparingly soluble sources.
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Claims 9
Claim · model-written summary
Resin-extractable P in topsoil from nine fields varied from 0.7 to 6.9 mg kg-1, below 5% of total P in all soils.
Not reportedTaxonDirection
Verbatim
e0“Resin-P varied from 0.7 to 6.9 mg kg-1 and was less than 5% of total P in all soils”
Claim · model-written summary
Olsen-P in the topsoils ranged between 0.8 and 8 mg kg-1.
Not reportedTaxonDirection
Verbatim
e0“Olsen-P ranged between 0.8 and 8 mg kg-1”
Claim · model-written summary
Bray 1 P in the topsoils varied from 2 to 20 mg kg-1.
Not reportedTaxonDirection
Verbatim
e0“Bray 1 P varied from 2 to 20 mg kg-1”
Claim · model-written summary
Bray 2 P in the topsoils had a mean of 9 mg kg-1, within the range of Bray 1 P.
Not reportedTaxonDirection
Verbatim
e0“Bray 2 P had a mean of 9 mg kg-1 and was within the same range as Bray 1 P”
Claim · model-written summary
Total dry matter yield of soybean, cowpea and maize was lowest under aluminium phosphate.
- Taxon
- soybean, cowpea and maize
Glycine max
Vigna unguiculata
Zea mayst0 - Treatment
- Al-Pe0
- Outcome
- total dry matter yielde0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean, cowpea and maize”
e0“The lowest total dry matter yield was under Al-P”
Claim · model-written summary
On average, growth under calcium phosphate and triple superphosphate was similar.
- Taxon
- soybean, cowpea and maizeGlycine maxVigna unguiculataZea mayst0
- Treatment
- Ca-Pe0
- Outcome
- growthe0
- Direction
- similare0
- Comparator
- TSPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean, cowpea and maize”
e0“On average, growth under Ca-P and TSP were similar”
Claim · model-written summary
Based on P uptake efficiency, cowpea IT89KD-391 grew better than other genotypes in Ca-P amended soil.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- IT89KD-391e0
- Treatment
- Ca-P amended soile0
- Outcome
- P uptake efficiencye0
- Direction
- grew bettere0
- Comparator
- other genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Data on P uptake efficiency suggest that cowpea IT89KD-391 grew better than other genotypes in Ca-P amended soil”
Claim · model-written summary
Results of cowpea IT90K-59 under Fe-P, Ca-P and TSP were similar.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- IT90K-59e0
- Treatment
- Fe P, Ca-P, and TSPe0
- Outcome
- resultse0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the results of cowpea IT90K-59 under Fe P, Ca-P, and TSP were similar”
Claim · model-written summary
The authors suggest differences in growth might be attributed to differing ability to acquire P from sparingly soluble sources.
- Taxon
- soybean, cowpea and maizeGlycine maxVigna unguiculataZea mayst0
- Outcome
- Differences in growthe0
- Qualifier
- differing ability to acquire P from sparingly soluble sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean, cowpea and maize”
e0“Differences in growth might be attributed to differing ability to acquire P from sparingly soluble sources”
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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.