Abstract
Rhizosphere processes play a critical role in phosphorus (P) acquisition by plants and microbes, especially under P-limited conditions. Here, we investigated the impacts of nutrient addition and plant species on plant growth, rhizosphere processes, and soil P dynamics. In a glasshouse experiment, blue lupin (Lupinus angustifolius), white clover (Trifolium repens L.), perennial ryegrass (Lolium perenne L.), and wheat (Triticum aestivum L.) were grown in a low-P pasture soil for 8 weeks with and without the single and combined addition of P (33 mg kg−1) and nitrogen (200 mg kg−1). Phosphorus addition increased plant biomass and total P content across plant species, as well as microbial biomass P in white clover and ryegrass. Alkaline phosphatase activity was higher for blue lupin. Legumes showed higher concentrations of organic anions compared to grasses. After P addition, the concentrations of organic anions increased by 11-,10-, 5-, and 2-fold in the rhizospheres of blue lupin, white clover, wheat, and ryegrass, respectively. Despite the differences in their chemical availability (as assessed by P fractionation), moderately labile inorganic P and stable organic P were the most depleted fractions by the four plant species. Inorganic P fractions were depleted similarly between the four plant species, while blue lupin exhibited a strong depletion of stable organic P. Our findings suggest that organic anions were not related to the acquisition of inorganic P for legumes and grasses. At the same time, alkaline phosphatase activity was associated with the mobilization of stable organic P for blue lupin.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 14
Claim · model-written summary
Phosphorus addition increased plant biomass across the tested species.
Not reportedComparator
Verbatim
e0“Phosphorus addition increased plant biomass and total P content across plant species, as well as microbial biomass P in white clover and ryegrass.”
Claim · model-written summary
Phosphorus addition increased total plant P content across species.
Not reportedComparator
Verbatim
e0“Phosphorus addition increased plant biomass and total P content across plant species, as well as microbial biomass P in white clover and ryegrass.”
Claim · model-written summary
Phosphorus addition increased microbial biomass P in white clover and ryegrass rhizospheres.
- Taxon
- white clover and ryegrass
Trifolium repens
Loliume0 - Treatment
- Phosphorus additione0
- Outcome
- microbial biomass Pe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus addition increased plant biomass and total P content across plant species, as well as microbial biomass P in white clover and ryegrass.”
Claim · model-written summary
Blue lupin had higher alkaline phosphatase activity.
Verbatim
e0“Alkaline phosphatase activity was higher for blue lupin.”
Claim · model-written summary
Legumes had higher organic anion concentrations than grasses.
Verbatim
e0“Legumes showed higher concentrations of organic anions compared to grasses.”
Claim · model-written summary
P addition increased organic anions in the blue lupin rhizosphere by 11-.
- Taxon
- blue lupine0
- Treatment
- P additione0
- Outcome
- concentrations of organic anionse0
- Direction
- increasede0
- Value
- 11-e0
Not reportedComparator
Verbatim
e0“After P addition, the concentrations of organic anions increased by 11-,10-, 5-, and 2-fold in the rhizospheres of blue lupin, white clover, wheat, and ryegrass, respectively.”
Claim · model-written summary
P addition increased organic anions in the white clover rhizosphere by 10-.
- Taxon
- white cloverTrifolium repense0
- Treatment
- P additione0
- Outcome
- concentrations of organic anionse0
- Direction
- increasede0
- Value
- 10-e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After P addition, the concentrations of organic anions increased by 11-,10-, 5-, and 2-fold in the rhizospheres of blue lupin, white clover, wheat, and ryegrass, respectively.”
Claim · model-written summary
P addition increased organic anions in the wheat rhizosphere by 5-.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- P additione0
- Outcome
- concentrations of organic anionse0
- Direction
- increasede0
- Value
- 5-e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After P addition, the concentrations of organic anions increased by 11-,10-, 5-, and 2-fold in the rhizospheres of blue lupin, white clover, wheat, and ryegrass, respectively.”
Claim · model-written summary
P addition increased organic anions in the ryegrass rhizosphere by 2-fold.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After P addition, the concentrations of organic anions increased by 11-,10-, 5-, and 2-fold in the rhizospheres of blue lupin, white clover, wheat, and ryegrass, respectively.”
Claim · model-written summary
Moderately labile inorganic P and stable organic P were the fractions most depleted by the four plant species.
Verbatim
e0“moderately labile inorganic P and stable organic P were the most depleted fractions by the four plant species.”
Claim · model-written summary
The four plant species depleted inorganic P fractions similarly.
Verbatim
e0“Inorganic P fractions were depleted similarly between the four plant species, while blue lupin exhibited a strong depletion of stable organic P.”
Claim · model-written summary
Blue lupin strongly depleted stable organic P.
Verbatim
e0“Inorganic P fractions were depleted similarly between the four plant species, while blue lupin exhibited a strong depletion of stable organic P.”
Claim · model-written summary
Organic anions were not related to inorganic P acquisition by legumes and grasses.
Not reportedDirection
Verbatim
e0“Our findings suggest that organic anions were not related to the acquisition of inorganic P for legumes and grasses.”
Claim · model-written summary
Alkaline phosphatase activity was associated with stable organic P mobilization in blue lupin.
Not reportedDirection
Verbatim
e0“alkaline phosphatase activity was associated with the mobilization of stable organic P for blue lupin.”
The same questions in other papers
phosphorus · molecular: metabolites · LoliumPositive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
phosphorus · molecular: metabolites · Trifolium repens (white clover)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
2 papers more in this group
See all 6 papers →phosphorus · molecular: metabolites · Triticum aestivum (wheat)Positive and negative results
34 papers in the same direction as this paper · 18 in the opposite direction
- negative
- no effect
- no effect
49 papers more in this group
See all 53 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.