Abstract
Soil type and management practices can affect Allium growth and quality. This study investigated the effects of water-deficit stress and soil type on tissue water content, plant growth and dry-matter production of spring onion (Allium cepa L.) cv. White Lisbon. Seedlings were grown in a glasshouse in pots containing clay (Alluvial Gley) or sandy loam (Brown Earth). Irrigation treatments were watering to near field capacity (−0.01 MPa), or re-watering to near field capacity when the available soil moisture level was depleted to either ≤ 50% (−0.80 MPa) or ≤ 25% (−1.19 MPa). Watering to field capacity significantly (P < 0.05) increased relative water content and water potential of leaf tissue. Periodic water-deficit stress increased leaf number, but reduced leaf length. At −0.01 MPa, plant fresh weight and dry-matter content were increased, especially for plants grown on clay as compared with the −0.80 or −1.19 MPa treatments. Irrigation to near field capacity improved growth and dry-matter production. A greater proportion of colloids, and greater water storage capacity of the clay soil, compared to the sandy loam, caused an increase in plant growth and dry-matter. Attainment of functional equilibrium maintained a balance between shoots and roots fresh weight ratio, irrespective of irrigation treatment and soil type. In conclusion, deficit irrigation especially on the sandy loam caused physiological stress that reduced spring onion growth and dry-matter yield compared to regular irrigation. The good water retention capacity of the clay soil compensated for deficit irrigation compared to the sandy loam.
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Claims 8
Claim · model-written summary
Field-capacity watering significantly increased leaf relative water content and potential.
- Taxon
- spring onion
Allium cepat0 - Treatment
- Watering to field capacitye0
- Outcome
- relative water content and water potential of leaf tissuee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Watering to field capacity significantly (P < 0.05) increased relative water content and water potential of leaf tissue.”
t0“spring onion”
Claim · model-written summary
Periodic water deficit increased leaf number.
- Taxon
- spring onionAllium cepat0
- Treatment
- Periodic water-deficit stresse0
- Outcome
- leaf numbere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Periodic water-deficit stress increased leaf number, but reduced leaf length.”
t0“spring onion”
Claim · model-written summary
Periodic water deficit reduced leaf length.
- Taxon
- spring onionAllium cepat0
- Treatment
- Periodic water-deficit stresse0
- Outcome
- leaf lengthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Periodic water-deficit stress increased leaf number, but reduced leaf length.”
t0“spring onion”
Claim · model-written summary
Watering at −0.01 MPa increased plant fresh weight, especially on clay.
- Taxon
- spring onionAllium cepat0
- Treatment
- −0.01 MPae0
- Outcome
- plant fresh weighte0
- Direction
- increasede0
- Qualifier
- especially for plants grown on claye0
- Comparator
- −0.80 or −1.19 MPa treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At −0.01 MPa, plant fresh weight and dry-matter content were increased, especially for plants grown on clay as compared with the −0.80 or −1.19 MPa treatments.”
t0“spring onion”
Claim · model-written summary
Watering at −0.01 MPa increased dry-matter content, especially on clay.
- Taxon
- spring onionAllium cepat0
- Treatment
- −0.01 MPae0
- Outcome
- dry-matter contente0
- Direction
- increasede0
- Qualifier
- especially for plants grown on claye0
- Comparator
- −0.80 or −1.19 MPa treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At −0.01 MPa, plant fresh weight and dry-matter content were increased, especially for plants grown on clay as compared with the −0.80 or −1.19 MPa treatments.”
t0“spring onion”
Claim · model-written summary
Clay soil increased plant growth and dry matter relative to sandy loam.
- Taxon
- spring onionAllium cepat0
- Treatment
- clay soile0
- Outcome
- plant growth and dry-mattere0
- Direction
- increasee0
- Comparator
- sandy loame0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greater proportion of colloids, and greater water storage capacity of the clay soil, compared to the sandy loam, caused an increase in plant growth and dry-matter.”
t0“spring onion”
Claim · model-written summary
Shoot-to-root fresh weight ratio stayed balanced across irrigation and soil treatments.
- Taxon
- spring onionAllium cepat0
- Outcome
- balance between shoots and roots fresh weight ratioe0
- Qualifier
- irrespective of irrigation treatment and soil typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Attainment of functional equilibrium maintained a balance between shoots and roots fresh weight ratio, irrespective of irrigation treatment and soil type.”
t0“spring onion”
Claim · model-written summary
Deficit irrigation on sandy loam reduced spring onion growth and dry-matter yield relative to regular irrigation.
- Taxon
- spring onionAllium cepae0
- Treatment
- deficit irrigatione0
- Outcome
- spring onion growth and dry-matter yielde0
- Direction
- reducede0
- Qualifier
- especially on the sandy loame0
- Comparator
- regular irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deficit irrigation especially on the sandy loam caused physiological stress that reduced spring onion growth and dry-matter yield compared to regular irrigation.”
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