Abstract
Alkaline soil is widely distributed in China. Its rational utilization is an effective measure to solve land shortage and improve the environment. Alfalfa is characterized by strong salt and alkali tolerance and high yield and protein content. Nitrogen (N) and phosphorus (P) are the main nutrients for plant growth, and N metabolism is one of the primary forms of plant metabolism, which plays a vital role in quality and yield formation. The exploration of the effect of N and P on N metabolism and alfalfa growth will provide a theoretical basis for scientific fertilization for alfalfa in the alkaline soil of the Yinchuan Plain of the Hetao Basin. Therefore, a 2-year experiment of N and P addition was conducted. Six treatments were set up with a randomized block design, including without N (WN), medium N (MN), high N (HN), without P (WP), medium P (MP), and high P (HP). It was found that the MN and MP treatments increased plant height, stem diameter, stem/leaf, dry/fresh, and dry matter of alfalfa. The HN and HP treatments inhibited alfalfa biomass formation. The MN and MP treatments increased key products and enzymes of leaf N metabolism of alfalfa and promoted activities of leaf nitrate reductase (NR), glutamine synthase (GS), glutamate synthase (GOGAT), glutamic-oxalacetic transaminase (GOT), and glutamic-pyruvate transaminase (GPT), and inhibited activities of leaf protease of alfalfa. The MN and MP treatments increased contents of leaf N, P, ammonium nitrogen (NH 4 + -N), nitrate nitrogen (NO 3 − -N), total chlorophyll, and protein and reduced leaf chlorophyll a/b and amino acid, results after HN and HP treatments were opposite. The correlation among leaf P, N, NO 3 − -N, amino acid, and protein reached significant levels ( P < 0.01). It is suggested that MN and MP treatments can improve the yield and quality of alfalfa by increasing key products and enzymes of N metabolism and can be adopted to promote alfalfa production in the alkaline soil of the Yinchuan Plain of the Hetao Basin.
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Claims 11
Claim · model-written summary
Medium nitrogen increased alfalfa growth and biomass traits.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- MNe0
- Outcome
- plant height, stem diameter, stem/leaf, dry/fresh, and dry mattere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the MN and MP treatments increased plant height, stem diameter, stem/leaf, dry/fresh, and dry matter of alfalfa”
Claim · model-written summary
Medium phosphorus increased alfalfa growth and biomass traits.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- MPe0
- Outcome
- plant height, stem diameter, stem/leaf, dry/fresh, and dry mattere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the MN and MP treatments increased plant height, stem diameter, stem/leaf, dry/fresh, and dry matter of alfalfa”
Claim · model-written summary
High nitrogen inhibited alfalfa biomass formation.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- HNe0
- Outcome
- biomass formatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The HN and HP treatments inhibited alfalfa biomass formation.”
Claim · model-written summary
High phosphorus inhibited alfalfa biomass formation.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- HPe0
- Outcome
- biomass formatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The HN and HP treatments inhibited alfalfa biomass formation.”
Claim · model-written summary
Medium nitrogen and phosphorus promoted leaf nitrogen metabolism enzyme activities in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- MN and MP treatmentse0
- Outcome
- activities of leaf nitrate reductase (NR), glutamine synthase (GS), glutamate synthase (GOGAT), glutamic-oxalacetic transaminase (GOT), and glutamic-pyruvate transaminase (GPT)e0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MN and MP treatments increased key products and enzymes of leaf N metabolism of alfalfa and promoted activities of leaf nitrate reductase (NR), glutamine synthase (GS), glutamate synthase (GOGAT), glutamic-oxalacetic transaminase (GOT), and glutamic-pyruvate transaminase (GPT)”
Claim · model-written summary
Medium nitrogen and phosphorus inhibited alfalfa leaf protease activity.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- MN and MP treatmentse0
- Outcome
- activities of leaf proteasee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MN and MP treatments increased key products and enzymes of leaf N metabolism of alfalfa and promoted activities of leaf nitrate reductase (NR), glutamine synthase (GS), glutamate synthase (GOGAT), glutamic-oxalacetic transaminase (GOT), and glutamic-pyruvate transaminase (GPT), and inhibited activities of leaf protease of alfalfa.”
Claim · model-written summary
Medium nitrogen and phosphorus increased leaf nutrient and chlorophyll and protein contents in alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- MN and MP treatmentse0
- Outcome
- contents of leaf N, P, ammonium nitrogen (NH 4 + -N), nitrate nitrogen (NO 3 − -N), total chlorophyll, and proteine0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MN and MP treatments increased contents of leaf N, P, ammonium nitrogen (NH 4 + -N), nitrate nitrogen (NO 3 − -N), total chlorophyll, and protein”
t0“alfalfa”
Claim · model-written summary
Medium nitrogen and phosphorus reduced alfalfa leaf chlorophyll a/b and amino acid.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- MN and MP treatmentse0
- Outcome
- leaf chlorophyll a/b and amino acide0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MN and MP treatments increased contents of leaf N, P, ammonium nitrogen (NH 4 + -N), nitrate nitrogen (NO 3 − -N), total chlorophyll, and protein and reduced leaf chlorophyll a/b and amino acid”
t0“alfalfa”
Claim · model-written summary
High nitrogen and phosphorus showed opposite leaf-content responses to medium additions.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- HN and HP treatmentse0
- Outcome
- resultse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“results after HN and HP treatments were opposite”
t0“alfalfa”
Claim · model-written summary
Leaf phosphorus, nitrogen, nitrate, amino acid and protein were significantly correlated in alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- leafe0
- Outcome
- leaf P, N, NO 3 − -N, amino acid, and proteine0
- Value
- P < 0.01e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The correlation among leaf P, N, NO 3 − -N, amino acid, and protein reached significant levels ( P < 0.01).”
t0“alfalfa”
Claim · model-written summary
The authors recommend medium nitrogen and phosphorus additions for alfalfa production in the region.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- MN and MP treatmentse0
- Outcome
- yield and qualitye0
- Setting
- Yinchuan Plain of the Hetao Basine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is suggested that MN and MP treatments can improve the yield and quality of alfalfa by increasing key products and enzymes of N metabolism and can be adopted to promote alfalfa production in the alkaline soil of the Yinchuan Plain of the Hetao Basin.”
The same questions in other papers
nitrogen · growth · Medicago sativa (alfalfa)Results differ
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See all 28 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.