Abstract
BACKGROUND AND AIMS: Soil phosphorus (P) deficiency and salinity are constraints to crop productivity in arid and semiarid regions. Salinity may weaken the effect of P fertilization on plant growth. We investigated the interactive effects of soil P availability and salinity on plant growth, P nutrition and salt tolerance of two alfalfa (Medicago sativa) cultivars. METHODS: A pot experiment was carried out to grow two cultivars of alfalfa in a loess soil under a combination of different rates of added P (0, 40, 80 and 160 mg P kg-1 soil as monopotassium phosphate) and sodium chloride (0, 0.4, 0.8 and 1.6 g NaCl kg-1 soil). Plant biomass, concentrations of P ([P]), sodium ([Na]) and potassium ([K]) were determined, and rhizosheath carboxylates were analysed. KEY RESULTS: There were significant interactions between soil P availability and salinity on some, but not all, of the parameters investigated, and interactions depended on cultivar. Plant growth and P uptake were enhanced by P fertilization, but inhibited by increased levels of salinity. Increasing the salinity resulted in decreased plant P-uptake efficiency and [K]/[Na]. Only soil P availability had a significant effect on the amount of tartrate in the rhizosheath of both cultivars. CONCLUSIONS: Increased salinity aggravated P deficiency. Appropriate application of P fertilizers improved the salt tolerance of alfalfa and increased its productivity in saline soils.
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Claims 8
Claim · model-written summary
P fertilization enhanced alfalfa plant growth and P uptake.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- P fertilizatione1
- Outcome
- Plant growth and P uptakee1
- Direction
- enhancede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two alfalfa (Medicago sativa) cultivars”
e1“Plant growth and P uptake were enhanced by P fertilization, but inhibited by increased levels of salinity”
Claim · model-written summary
Increased salinity inhibited alfalfa plant growth and P uptake.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- increased levels of salinitye1
- Outcome
- Plant growth and P uptakee1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two alfalfa (Medicago sativa) cultivars”
e1“Plant growth and P uptake were enhanced by P fertilization, but inhibited by increased levels of salinity”
Claim · model-written summary
Increasing salinity decreased P-uptake efficiency and [K]/[Na] in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Increasing the salinitye2
- Outcome
- plant P-uptake efficiency and [K]/[Na]e2
- Direction
- decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two alfalfa (Medicago sativa) cultivars”
e2“Increasing the salinity resulted in decreased plant P-uptake efficiency and [K]/[Na]”
Claim · model-written summary
Soil P availability had a significant effect on rhizosheath tartrate in both alfalfa cultivars.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- soil P availabilitye3
- Outcome
- the amount of tartrate in the rhizosheathe3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two alfalfa (Medicago sativa) cultivars”
e3“Only soil P availability had a significant effect on the amount of tartrate in the rhizosheath of both cultivars”
Claim · model-written summary
Interactions of soil P availability and salinity were significant for some, but not all, alfalfa parameters, depending on cultivar.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- soil P availability and salinitye4
- Outcome
- some, but not all, of the parameters investigatede4
- Qualifier
- interactions depended on cultivare4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two alfalfa (Medicago sativa) cultivars”
e4“There were significant interactions between soil P availability and salinity on some, but not all, of the parameters investigated, and interactions depended on cultivar”
Claim · model-written summary
Appropriate P fertilizer application improved alfalfa salt tolerance.
- Taxon
- alfalfaMedicago sativae5
- Treatment
- Appropriate application of P fertilizerse5
- Outcome
- salt tolerance of alfalfae5
- Direction
- improvede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Appropriate application of P fertilizers improved the salt tolerance of alfalfa and increased its productivity in saline soils”
Claim · model-written summary
Appropriate P fertilizer application increased alfalfa productivity in saline soils.
- Taxon
- alfalfaMedicago sativae5
- Treatment
- Appropriate application of P fertilizerse5
- Outcome
- productivitye5
- Direction
- increasede5
- Setting
- saline soilse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Appropriate application of P fertilizers improved the salt tolerance of alfalfa and increased its productivity in saline soils”
Claim · model-written summary
Increased salinity aggravated P deficiency in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Increased salinitye6
- Outcome
- P deficiencye6
- Direction
- aggravatede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two alfalfa (Medicago sativa) cultivars”
e6“Increased salinity aggravated P deficiency”
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