Abstract
Due to the water scarcity in dry Mediterranean condition, determination of water and nitrogen (N) fertilizer needs is a major challenge for crop production and environment protection. Pot experiments under open field conditions were conducted for two consecutive years (2016 and 2017) to assess the effects of various levels of N-fertilizer and irrigation on onion crop, following a 4×3 factorial experiment arranged in a randomized block design with four N-fertilizer rates (0, 40, 80, and 120 kg N ha-1), and three irrigation levels (100, 80, and 60% of the seasonal water use), with three replications. Results indicated that the initial soil N-content (about 60 kg N ha-1) was sufficient to meet crop nitrogen requirements. However, results indicated that onion crop was sensitive to water stress, so that the highest total bulb yield (BY, 19.1 t ha-1), dry matter in bulbs (DM, 2.97 t ha-1), and water productivity (WP, 1.9 kg m-3) were found under full irrigation compared to the deficit conditions. BY, DM, and WP were predicted to be increased linearly with increasing levels of irrigation. The developed equations could be used for predicting onion crop yields under similar agro-pedo-climatic context, and as a tool for rational management of limited irrigation water.
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Claims 6
Claim · model-written summary
Initial soil nitrogen of about 60 kg N ha-1 met onion nitrogen requirements.
- Taxon
- Onion crop
Allium cepat0 - Outcome
- sufficient to meet crop nitrogen requirementse0
- Value
- about 60 kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion crop”
e0“the initial soil N-content (about 60 kg N ha-1) was sufficient to meet crop nitrogen requirements.”
Claim · model-written summary
Full irrigation gave the highest total bulb yield, 19.1 t ha-1.
- Taxon
- Onion cropAllium cepat0
- Treatment
- full irrigatione0
- Outcome
- total bulb yielde0
- Direction
- higheste0
- Value
- 19.1 t ha-1e0
- Comparator
- deficit conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion crop”
e0“the highest total bulb yield (BY, 19.1 t ha-1), dry matter in bulbs (DM, 2.97 t ha-1), and water productivity (WP, 1.9 kg m-3) were found under full irrigation compared to the deficit conditions.”
Claim · model-written summary
Full irrigation gave the highest bulb dry matter, 2.97 t ha-1.
- Taxon
- Onion cropAllium cepat0
- Treatment
- full irrigatione0
- Outcome
- dry matter in bulbse0
- Direction
- higheste0
- Value
- 2.97 t ha-1e0
- Comparator
- deficit conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion crop”
e0“the highest total bulb yield (BY, 19.1 t ha-1), dry matter in bulbs (DM, 2.97 t ha-1), and water productivity (WP, 1.9 kg m-3) were found under full irrigation compared to the deficit conditions.”
Claim · model-written summary
Full irrigation gave the highest water productivity, 1.9 kg m-3.
- Taxon
- Onion cropAllium cepat0
- Treatment
- full irrigatione0
- Outcome
- water productivitye0
- Direction
- higheste0
- Value
- 1.9 kg m-3e0
- Comparator
- deficit conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion crop”
e0“the highest total bulb yield (BY, 19.1 t ha-1), dry matter in bulbs (DM, 2.97 t ha-1), and water productivity (WP, 1.9 kg m-3) were found under full irrigation compared to the deficit conditions.”
Claim · model-written summary
The fitted equations predicted linear increases in bulb yield, dry matter, and water productivity with irrigation.
- Taxon
- Onion cropAllium cepat0
- Outcome
- BY, DM, and WPe0
- Direction
- increased linearlye0
- Comparator
- increasing levels of irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion crop”
e0“BY, DM, and WP were predicted to be increased linearly with increasing levels of irrigation.”
e1“The developed equations could be used for predicting onion crop yields under similar agro-pedo-climatic context”
Claim · model-written summary
The authors propose the equations for yield prediction and irrigation management.
- Taxon
- Onion cropAllium cepat0
- Outcome
- predicting onion crop yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion crop”
e0“The developed equations could be used for predicting onion crop yields under similar agro-pedo-climatic context, and as a tool for rational management of limited irrigation water.”
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