Agronomy of onions.

Serra, Andrea; Currah, L.

doi:10.1079/9780851995106.0187

Cited by 24 publications

(11 citation statements)

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“…Two field experiments were carried out during the 2017 and 2018 seasons at the Cajamar Experimental Centre in Paiporta, Valencia, Spain (39.4175 N, 0.4184 W). These experiments were performed in two different plots to avoid soil diseases caused by repeated onion cultivation [26]. Both soil plots are deep with a medium (silt loam) texture and are classified as Petrocalcic Calcixerepts according to the USDA Soil Taxonomy [34].…”

Section: Experimental Site Conditionsmentioning

confidence: 99%

“…Onion plants possess shallow-root systems, with most parts of the roots in the top 0.20 m of the soil [26,27]; therefore, onions require frequent and light water applications to avoid incurring large soil water deficits [28,29]. Hence, onions are very sensitive to water stress, requiring adequate irrigation management to achieve high commercial yields.…”

Section: Introductionmentioning

confidence: 99%

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Regulated Deficit Irrigation as a Water-Saving Strategy for Onion Cultivation in Mediterranean Conditions

Abdelkhalik

Pascual

Nájera³

et al. 2019

Agronomy

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Field experiments were performed for two growing seasons in Spain under Mediterranean conditions to evaluate the response of onion growth, plant water status, bulb yield, irrigation water use efficiency (IWUE), and gross revenue to regulated deficit irrigation strategies (RDI). Seven irrigation treatments were utilized, including the application of 100% irrigation water requirements (IWR) during the entire growing season and the application of 75% or 50% of the IWR during one of the following growth stages: the vegetative growth, bulbing, and bulb ripening stages. The deficit irrigation strategies tested decreased marketable yields to greater or lesser extents; therefore, if water is readily available, full irrigation would be recommended. The RDI with 50% of the IWR during the bulb ripening stage led to important water savings (22%) and to slight decreases in yield (9%), improving IWUE (20%) compared with full irrigation, and this strategy can be recommended under a severe water shortage. A satisfactory bulb yield was obtained with RDI with 75% of the IWR during the bulb ripening stages, resulting in a lower reduction in yield (4%) and in an increased IWUE (9%); this strategy is an advisable strategy for onion production under a mild water shortage in Mediterranean conditions.

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Section: Experimental Site Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regulated Deficit Irrigation as a Water-Saving Strategy for Onion Cultivation in Mediterranean Conditions

Abdelkhalik

Pascual

Nájera³

et al. 2019

Agronomy

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“…Bulb size is an important quality characteristic and different markets require different bulb sizes. According to Brewster (1994), a plant population between 50-100 plants m -2 will produce bulbs that are between 50-70 mm in diameter, which are preferred in most markets (Lai et al, 1994;Rumpel and Felczyński, 2000;Bosch Serra and Currah, 2002), while at a plant population of 25-50 plants m -2 large bulbs (>70 mm) suitable for the processing industry will be produced (McGeary, 1985;Shock et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Response of onion (Allium cepa L.) to sowing date and plant population in the Central Free State, South Africa

Bosekeng¹,

Coetzer²

2015

Afr. J. Agric. Res.

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The response of onion cv. Jaquar (Allium cepa L.) to sowing date and plant population was investigated in Bloemfontein (Free State Province, South Africa) during the year 2010. Jaquar seeds were sown on 11 and 25 May; and 8 June at five different populations (95, 83, 74, 67 and 61 plants m-2) in a randomized complete block design with each treatment combination replicated three times. Plant height and leaf number were measured 18 weeks after emergence. Bulb yield and quality (bulb mass, diameter, firmness and neck diameter) were recorded at harvesting. Significantly taller plants were obtained with the early sowing date (11 May) and a population between 61 and 74 plants m-2. Leaf production was not significantly influenced by any treatment. Bulb mass, yield and firmness were significantly higher with early sowing dates (11 or 25 May). Plant population significantly influenced bulb mass, but not yield. Bulb diameter increased as population decreased, irrespective of planting date. The three lowest populations (74, 67 and 61 plants m-2) yielded significantly harder bulbs than denser plants (83 and 95 plants m-2). The best sowing date for Jaquar in Bloemfontein was from 11 to 25 May at a population of between 61 and 74 plants m-2 .

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“…In order to obtain high yields of onion ( Allium cepa L.), large amounts of fertilizers are used in high-input cropping systems (Bosch-Serra and Currah 2002 ). These fertilizers are costly, and as the crop takes up only a minor part of these inputs (Greenwood et al 1982 ), negative impacts on the environment can be expected.…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis of the interaction between Allium species and arbuscular mycorrhizal fungi

et al. 2011

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The response of Alliumcepa, A. roylei, A. fistulosum, and the hybrid A. fistulosum × A. roylei to the arbuscular mycorrhizal fungus (AMF) Glomus intraradices was studied. The genetic basis for response to AMF was analyzed in a tri-hybrid A. cepa × (A. roylei × A. fistulosum) population. Plant response to mycorrhizal symbiosis was expressed as relative mycorrhizal responsiveness (R′) and absolute responsiveness (R). In addition, the average performance (AP) of genotypes under mycorrhizal and non-mycorrhizal conditions was determined. Experiments were executed in 2 years, and comprised clonally propagated plants of each genotype grown in sterile soil, inoculated with G. intraradices or non-inoculated. Results were significantly correlated between both years. Biomass of non-mycorrhizal and mycorrhizal plants was significantly positively correlated. R′ was negatively correlated with biomass of non-mycorrhizal plants and hence unsuitable as a breeding criterion. R and AP were positively correlated with biomass of mycorrhizal and non-mycorrhizal plants. QTLs contributing to mycorrhizal response were located on a linkage map of the A. roylei × A. fistulosum parental genotype. Two QTLs from A. roylei were detected on chromosomes 2 and 3 for R, AP, and biomass of mycorrhizal plants. A QTL from A. fistulosum was detected on linkage group 9 for AP (but not R), biomass of mycorrhizal and non-mycorrhizal plants, and the number of stem-borne roots. Co-segregating QTLs for plant biomass, R and AP indicate that selection for plant biomass also selects for enhanced R and AP. Moreover, our findings suggest that modern onion breeding did not select against the response to AMF, as was suggested before for other cultivated species. Positive correlation between high number of roots, biomass and large response to AMF in close relatives of onion opens prospects to combine these traits for the development of more robust onion cultivars.Electronic supplementary materialThe online version of this article (doi:10.1007/s00122-010-1501-8) contains supplementary material, which is available to authorized users.

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Agronomy of onions.

Cited by 24 publications

References 0 publications

Regulated Deficit Irrigation as a Water-Saving Strategy for Onion Cultivation in Mediterranean Conditions

Regulated Deficit Irrigation as a Water-Saving Strategy for Onion Cultivation in Mediterranean Conditions

Response of onion (Allium cepa L.) to sowing date and plant population in the Central Free State, South Africa

Genetic analysis of the interaction between Allium species and arbuscular mycorrhizal fungi

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