Abstract
Abstract Rational water and fertiliser management have an important impact on alfalfa production. This research aimed to explore the effects of water and phosphorus (P) fertiliser on water‐use efficiency (WUE) and phosphorus‐recovery efficiency (PRE) of each cut of alfalfa under drip irrigation and to determine the optimal interaction ratio of water and phosphorus to improve the quality and yield of alfalfa. Different irrigation levels were set, i.e., 5250, 6000 and 6750 m 3 /ha (referred to as W 1 , W 2 , W 3 , respectively), and P fertiliser levels (0, 50, 100 and 150 kg/ha P 2 O 5 referred to as P 0 , P 1 , P 2 , P 3 , respectively) were set to determine the hay yield and nutrient quality of each cut of alfalfa under drip irrigation. The hay yield of each cut of alfalfa increased first and then decreased with increased P fertiliser under the same irrigation amount. WUE decreased gradually with an increasing amount of irrigation under the same P application rate. The WUE of alfalfa increased first and then decreased with the increase of P application rate under the same irrigation amount, and WUE was 0.20%–4.75% (2016) and 1.31%–6.22% (2017) higher in the P treatments than in the non‐phosphorus treatments. PRE decreased gradually with increasing P application rate under the same irrigation amount. Therefore, we concluded that moderate irrigation (6000 m 3 /ha) and P fertiliser (100 kg/ha) optimised WUE, PRE, hay yield and nutrient quality.
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Claims 7
Claim · model-written summary
Alfalfa hay yield at each cut rose and then fell as phosphorus fertilizer increased at a fixed irrigation amount.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- increased P fertilisere0
- Outcome
- hay yield of each cut of alfalfae0
- Direction
- increased first and then decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The hay yield of each cut of alfalfa increased first and then decreased with increased P fertiliser under the same irrigation amount.”
t0“alfalfa”
Claim · model-written summary
Alfalfa water-use efficiency decreased with greater irrigation at a fixed phosphorus rate.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- increasing amount of irrigatione0
- Outcome
- WUEe0
- Direction
- decreased graduallye0
- Qualifier
- under the same P application ratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE decreased gradually with an increasing amount of irrigation under the same P application rate.”
t0“alfalfa”
Claim · model-written summary
Alfalfa water-use efficiency first rose and then fell as phosphorus application increased at fixed irrigation.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- increase of P application ratee0
- Outcome
- WUE of alfalfae0
- Direction
- increased first and then decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The WUE of alfalfa increased first and then decreased with the increase of P application rate under the same irrigation amount”
t0“alfalfa”
Claim · model-written summary
In 2016, phosphorus treatments raised water-use efficiency by 0.20%–4.75% relative to no phosphorus.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- P treatmentse0
- Outcome
- WUEe0
- Direction
- highere0
- Value
- 0.20%–4.75%e0
- Qualifier
- 2016e0
- Comparator
- non‐phosphorus treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE was 0.20%–4.75% (2016) and 1.31%–6.22% (2017) higher in the P treatments than in the non‐phosphorus treatments”
t0“alfalfa”
Claim · model-written summary
In 2017, phosphorus treatments raised water-use efficiency by 1.31%–6.22% relative to no phosphorus.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- P treatmentse0
- Outcome
- WUEe0
- Direction
- highere0
- Value
- 1.31%–6.22%e0
- Qualifier
- 2017e0
- Comparator
- non‐phosphorus treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE was 0.20%–4.75% (2016) and 1.31%–6.22% (2017) higher in the P treatments than in the non‐phosphorus treatments”
t0“alfalfa”
Claim · model-written summary
Phosphorus recovery efficiency declined as phosphorus application rose at fixed irrigation.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- increasing P application ratee0
- Outcome
- PREe0
- Direction
- decreased graduallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRE decreased gradually with increasing P application rate under the same irrigation amount.”
t0“alfalfa”
Claim · model-written summary
The authors concluded that moderate irrigation and phosphorus fertilizer optimized water-use efficiency, phosphorus recovery, hay yield and nutrient quality.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- moderate irrigation (6000 m 3 /ha) and P fertiliser (100 kg/ha)e0
- Outcome
- optimised WUE, PRE, hay yield and nutrient qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate irrigation (6000 m 3 /ha) and P fertiliser (100 kg/ha) optimised WUE, PRE, hay yield and nutrient quality”
t0“alfalfa”
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See all 33 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.