Abstract
The effects of a superphosphate (SP) and a rock phosphate (RP), with equal total P contents, on the growth and mineral nutrition responses of mycorrhizal and nonmycorrhizal cowpea, pigeon pea and groundnut were investigated in a pot experiment using an air-dry gamma ray-sterilized (1.5Mrad) Andisol subsoil. Adequate amounts of micronutrients were added to the pot soils as supplements. The plants were inoculated with surface-sterilized 100 spores/pot of Glomus etunicatum or none and with Rhizobium strains. At their maturities, dry weights of plant parts and nodule number, root length, arbuscular mycorrhizal fungal (AMF) colonization of roots and AMF spore production were also measured. Shoot nitrogen and phosphorus concentrations were determined by the Micro-Kjeldahl distillation and ammonium-molybdenum blue methods, respectively. Shoot copper and iron concentrations were measured by the atomic absorption spectrophotometry. Mycorrhiza formation was greater with superphosphate than with rock phosphate treatments. Rock phosphate enhanced mycorrhization in cowpea and pigeon pea but it decreased it in groundnut. Superphosphate-treated cowpea and pigeon pea plants were larger than RP-treated plants whether mycorrhizal or not but in groundnut growth increased only when the plant was treated with SP and inoculated with AMF. Mycorrhizal enhancement of shoot growth in superphosphate-fertilized groundnut could be a direct consequence of improved P nutrition resulting from increased hyphal uptake and/or enlarged absorptive root surface due to increased root fineness. There were similarities in shoot dry matter yields as well as shoot P uptakes of both mycorrhizal and non-mycorrhizal RP-treated plants suggesting that the legumes were so unresponsive to the RP that even mycorrhization could not trigger any response in them. The increased contents of N, Cu and Fe in the shoots of mycorrhizal SP-fertilized plants were observed to be the result of larger shoot sizes except with Fe in groundnut shoot whose enhancement could be related to a good mycorrhiza formation and a concomitant improvement in P nutrition which may further have been influenced by its fine root structure. There was a very close interdependency of fine root structure, AMF colonization, AMFspore production and improved P and Fe nutrition in groundnut as a result of soluble phosphate application.Journal of Science & Technology (Ghana) Vol. 27 (2) 2007: pp. 43-56
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Mycorrhiza formation was greater with superphosphate than with rock phosphate.
- Taxon
- cowpea, pigeon pea and groundnut
Arachis hypogaea
Cajanus cajan
Vigna unguiculatat0 - Treatment
- superphosphatee0
- Outcome
- Mycorrhiza formatione0
- Direction
- greatere0
- Comparator
- rock phosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e0“Mycorrhiza formation was greater with superphosphate than with rock phosphate treatments”
Claim · model-written summary
Rock phosphate enhanced mycorrhization in cowpea and pigeon pea.
- Taxon
- cowpea and pigeon peaCajanus cajanVigna unguiculatae1
- Treatment
- Rock phosphatee1
- Outcome
- mycorrhizatione1
- Direction
- enhancede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e1“Rock phosphate enhanced mycorrhization in cowpea and pigeon pea but it decreased it in groundnut”
Claim · model-written summary
Rock phosphate decreased mycorrhization in groundnut.
- Taxon
- groundnutArachis hypogaeae1
- Treatment
- Rock phosphatee1
- Outcome
- mycorrhizatione1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e1“Rock phosphate enhanced mycorrhization in cowpea and pigeon pea but it decreased it in groundnut”
Claim · model-written summary
Superphosphate-treated cowpea and pigeon pea plants were larger than rock phosphate-treated plants, whether mycorrhizal or not.
- Taxon
- cowpea and pigeon peaCajanus cajanVigna unguiculatae2
- Treatment
- Superphosphate-treatede2
- Outcome
- plantse2
- Direction
- largere2
- Comparator
- RP-treated plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e2“Superphosphate-treated cowpea and pigeon pea plants were larger than RP-treated plants whether mycorrhizal or not”
Claim · model-written summary
Groundnut growth increased only when superphosphate was applied and the plant was inoculated with AMF.
- Taxon
- groundnutArachis hypogaeae2
- Treatment
- SP and inoculated with AMFe2
- Interactor
- AMFe2symbiont
- Outcome
- growthe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e2“in groundnut growth increased only when the plant was treated with SP and inoculated with AMF”
Claim · model-written summary
Mycorrhizal enhancement of shoot growth in superphosphate-fertilized groundnut could result from improved phosphorus nutrition.
- Taxon
- groundnutArachis hypogaeae3
- Treatment
- superphosphate-fertilizede3
- Outcome
- shoot growthe3
- Qualifier
- improved P nutritione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e3“Mycorrhizal enhancement of shoot growth in superphosphate-fertilized groundnut could be a direct consequence of improved P nutrition resulting from increased hyphal uptake”
Claim · model-written summary
Shoot dry matter yields and shoot P uptake were similar in mycorrhizal and non-mycorrhizal rock phosphate-treated plants.
- Taxon
- cowpea, pigeon pea and groundnutArachis hypogaeaCajanus cajanVigna unguiculatat0
- Treatment
- mycorrhizale4
- Outcome
- shoot dry matter yieldse4
- Direction
- no_changeinferrede4
- Comparator
- non-mycorrhizale4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e4“There were similarities in shoot dry matter yields as well as shoot P uptakes of both mycorrhizal and non-mycorrhizal RP-treated plants”
Claim · model-written summary
Mycorrhizal superphosphate-fertilized plants had increased shoot contents of N, Cu and Fe, attributed to larger shoot size.
- Taxon
- cowpea, pigeon pea and groundnutArachis hypogaeaCajanus cajanVigna unguiculatat0
- Organ / stage
- shootse5
- Treatment
- mycorrhizale5
- Outcome
- contents of N, Cu and Fee5
- Direction
- increasede5
- Qualifier
- except with Fe in groundnute5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cowpea, pigeon pea and groundnut”
e5“The increased contents of N, Cu and Fe in the shoots of mycorrhizal SP-fertilized plants were observed to be the result of larger shoot sizes except with Fe in groundnut”
The same questions in other papers
phosphorus · growth · Vigna unguiculata (cowpea)Results differ
51 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- no effect
52 papers more in this group
See all 56 papers →mycorrhiza · yield · Cajanus cajan (pigeon pea)Positive and negative results
6 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →mycorrhiza · yield · Vigna unguiculata (cowpea)Positive and negative results
1 paper in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 papers →phosphorus · growth · Cajanus cajan (pigeon pea)Positive and negative results
12 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
10 papers more in this group
See all 14 papers →mycorrhiza · growth · Arachis hypogaea (peanut)Positive and negative results
17 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
15 papers more in this group
See all 19 papers →mycorrhiza · yield · Arachis hypogaea (peanut)Positive and negative results
1 paper in the same direction as this paper · 27 in the opposite direction
- positive
- positive
- positive
25 papers more in this group
See all 29 papers →phosphorus · growth · Arachis hypogaea (peanut)Positive and negative results
42 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- no effect
42 papers more in this group
See all 46 papers →inoculation · growth · Arachis hypogaea (peanut)Positive and negative results
101 papers in the same direction as this paper · 16 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- negative
115 papers more in this group
See all 119 papers →8 of 11 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.