Abstract
Herbage yield of alfalfa ( Medicago sativa L.) depends on forage management or environmental conditions that change C and N resource acquisition, and endogenous plants factors such as root organic reserves and number of active meristems. The aim of this work is to study the influence of two sowing dates in summer (12 July or 9 August), N fertilization (0 or 100 kg ha −1 ) and/or irrigation applied during the first year of alfalfa establishment on (i) the accumulation of N organic reserves (soluble proteins and more specifically vegetative storage protein) in taproots during autumn, (ii) the number of crown axillary meristems present at the end of winter and (iii) the dynamics of spring shoot growth. Delaying the sowing date for one month reduced root growth and root N storage, especially vegetative storage proteins (VSP) during autumn. Irrespective of sowing dates, N fertilization did not affect root biomass, number of crown buds, total root N, root soluble protein or VSP concentrations. By contrast, water deficiency during alfalfa establishment in the early summer reduced both root growth and N reserve accumulation. When spring growth resumed, there is a significant linear relationship between leaf area development and soluble protein and VSP concentrations in taproots, and also the number of crown buds. The results showed that an early sowing date and adequate water status during the summer allowed alfalfa plants to accumulate N reserves by increasing taproot mass and soluble protein concentrations, especially VSPs. This resulted in rapid shoot regrowth rates the following spring.
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Claims 8
Claim · model-written summary
Delaying sowing by one month reduced root growth and root N storage in alfalfa during autumn, especially VSP.
- Taxon
- alfalfa
Medicago sativae0 - Organ / stage
- roote1
- Treatment
- Delaying the sowing date for one monthe1
- Outcome
- root growth and root N storagee1
- Direction
- reducede1
- Qualifier
- especially vegetative storage proteins (VSP) during autumne1
- Comparator
- 12 Julye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbage yield of alfalfa ( Medicago sativa L.)”
e1“Delaying the sowing date for one month reduced root growth and root N storage, especially vegetative storage proteins (VSP) during autumn”
e2“two sowing dates in summer (12 July or 9 August)”
Claim · model-written summary
N fertilization did not affect root biomass, number of crown buds or total root N in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- roote3
- Treatment
- N fertilizatione3
- Outcome
- root biomass, number of crown buds, total root Ne3
- Direction
- did not affecte3
- Qualifier
- Irrespective of sowing datese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbage yield of alfalfa ( Medicago sativa L.)”
e3“Irrespective of sowing dates, N fertilization did not affect root biomass, number of crown buds, total root N, root soluble protein or VSP concentrations”
Claim · model-written summary
N fertilization did not affect root soluble protein or VSP concentrations in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- roote3
- Treatment
- N fertilizatione3
- Outcome
- root soluble protein or VSP concentrationse3
- Direction
- did not affecte3
- Qualifier
- Irrespective of sowing datese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbage yield of alfalfa ( Medicago sativa L.)”
e3“Irrespective of sowing dates, N fertilization did not affect root biomass, number of crown buds, total root N, root soluble protein or VSP concentrations”
Claim · model-written summary
Water deficiency during establishment in early summer reduced root growth and N reserve accumulation in alfalfa.
- Taxon
- alfalfaMedicago sativae4
- Organ / stage
- roote4
- Treatment
- water deficiency during alfalfa establishment in the early summere4
- Outcome
- root growth and N reserve accumulatione4
- Direction
- reducede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbage yield of alfalfa ( Medicago sativa L.)”
e4“water deficiency during alfalfa establishment in the early summer reduced both root growth and N reserve accumulation”
Claim · model-written summary
Soluble protein and VSP concentrations in alfalfa taproots show a significant linear relationship with leaf area development.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- taprootse5
- Outcome
- soluble protein and VSP concentrationse5
- Qualifier
- leaf area developmente5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbage yield of alfalfa ( Medicago sativa L.)”
e5“there is a significant linear relationship between leaf area development and soluble protein and VSP concentrations in taproots”
Claim · model-written summary
The number of crown buds in alfalfa shows a significant linear relationship with leaf area development.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- number of crown budse6
- Qualifier
- leaf area developmente5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbage yield of alfalfa ( Medicago sativa L.)”
e5“there is a significant linear relationship between leaf area development and soluble protein and VSP concentrations in taproots”
e6“and also the number of crown buds”
Claim · model-written summary
An early sowing date with adequate summer water status increased taproot mass and soluble protein concentrations in alfalfa.
- Taxon
- alfalfa plantsMedicago sativae7
- Organ / stage
- taproote7
- Treatment
- an early sowing date and adequate water status during the summere7
- Outcome
- taproot mass and soluble protein concentrationse7
- Direction
- increasinge7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The results showed that an early sowing date and adequate water status during the summer allowed alfalfa plants to accumulate N reserves by increasing taproot mass and soluble protein concentrations, especially VSPs”
Claim · model-written summary
Early sowing with adequate summer water status resulted in rapid shoot regrowth in spring in alfalfa.
- Taxon
- alfalfa plantsMedicago sativae7
- Treatment
- an early sowing date and adequate water status during the summere7
- Outcome
- shoot regrowth ratese6
- Direction
- rapide6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The results showed that an early sowing date and adequate water status during the summer allowed alfalfa plants to accumulate N reserves by increasing taproot mass and soluble protein concentrations, especially VSPs”
e6“This resulted in rapid shoot regrowth rates the following spring”
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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.