Abstract
Water is an essential resource for food production, and agriculture consumes close to 69% of total freshwater use. Water shortage is becoming critical in arid and semiarid areas worldwide; therefore, it is vital to use water efficiently. The objective of this research was to evaluate the response of onion growth, plant water status, bulb yield, irrigation water use efficiency and bulb quality using three continued deficit strategies, applying 100, 75, and 50% of the irrigation water requirements during three seasons. The yield response factor was 0.71, indicating that in the analysed conditions the crop was tolerant to a water deficit. Compared to full irrigation, deficit irrigation with 75% of the irrigation water requirements resulted in a low yield and profit reduction for the growers (10.3% and 10.9%, respectively), but also important water savings (26.6%), improving both the irrigation water use efficiency and water use efficiency. However, onion exposure to severe water deficits at 50% of the irrigation water requirements drastically reduced plant growth and bulb yield and growers’ profits, although it did increase their soluble solid content. Irrigating at 75% of the irrigation water requirements could be an actionable strategy for onion production under water-limited conditions.
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Claims 10
Claim · model-written summary
The onion yield response factor was 0.71, indicating tolerance of water deficit under the tested conditions.
Not reportedTaxon
Verbatim
e0“The yield response factor was 0.71, indicating that in the analysed conditions the crop was tolerant to a water deficit.”
Claim · model-written summary
Irrigating onion at 75% of requirements reduced yield by 10.3% relative to full irrigation.
- Treatment
- deficit irrigation with 75% of the irrigation water requirementse0
- Outcome
- yielde0
- Direction
- reductione0
- Value
- 10.3%e0
- Comparator
- full irrigatione0
Not reportedTaxon
Verbatim
e0“Compared to full irrigation, deficit irrigation with 75% of the irrigation water requirements resulted in a low yield and profit reduction for the growers (10.3% and 10.9%, respectively)”
Claim · model-written summary
Irrigating onion at 75% of requirements reduced grower profit by 10.9% relative to full irrigation.
- Treatment
- deficit irrigation with 75% of the irrigation water requirementse0
- Outcome
- profite0
- Direction
- reductione0
- Value
- 10.9%e0
- Comparator
- full irrigatione0
Not reportedTaxon
Verbatim
e0“Compared to full irrigation, deficit irrigation with 75% of the irrigation water requirements resulted in a low yield and profit reduction for the growers (10.3% and 10.9%, respectively)”
Claim · model-written summary
Irrigating onion at 75% of requirements saved 26.6% of water relative to full irrigation.
Not reportedTaxonTreatmentComparator
Verbatim
e0“but also important water savings (26.6%), improving both the irrigation water use efficiency and water use efficiency.”
Claim · model-written summary
Irrigating onion at 75% of requirements improved irrigation water use efficiency and water use efficiency.
Not reportedTaxonTreatmentComparator
Verbatim
e0“improving both the irrigation water use efficiency and water use efficiency.”
Claim · model-written summary
Irrigating onion at 50% of requirements drastically reduced plant growth.
- Taxon
- onion
Allium cepae0 - Treatment
- severe water deficits at 50% of the irrigation water requirementse0
- Outcome
- plant growthe0
- Direction
- drastically reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onion exposure to severe water deficits at 50% of the irrigation water requirements drastically reduced plant growth and bulb yield and growers’ profits”
Claim · model-written summary
Irrigating onion at 50% of requirements drastically reduced bulb yield.
- Taxon
- onionAllium cepae0
- Treatment
- severe water deficits at 50% of the irrigation water requirementse0
- Outcome
- bulb yielde0
- Direction
- drastically reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onion exposure to severe water deficits at 50% of the irrigation water requirements drastically reduced plant growth and bulb yield and growers’ profits”
Claim · model-written summary
Irrigating onion at 50% of requirements drastically reduced grower profit.
- Taxon
- onionAllium cepae0
- Treatment
- severe water deficits at 50% of the irrigation water requirementse0
- Outcome
- growers’ profitse0
- Direction
- drastically reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“onion exposure to severe water deficits at 50% of the irrigation water requirements drastically reduced plant growth and bulb yield and growers’ profits”
Claim · model-written summary
Irrigating onion at 50% of requirements increased bulb soluble solid content.
Not reportedTaxonTreatmentComparator
Verbatim
e0“although it did increase their soluble solid content.”
Claim · model-written summary
The authors recommend irrigation at 75% of requirements for onion production where water is limited.
- Taxon
- onionAllium cepae0
- Outcome
- Irrigating at 75% of the irrigation water requirementse0
- Qualifier
- water-limited conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigating at 75% of the irrigation water requirements could be an actionable strategy for onion production under water-limited conditions.”
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