Effect of set-size and planting time on the incidence of bolting, bulbing, and seed yield in two onion cultivars

Khokhar, K. M.

doi:10.1080/14620316.2008.11512411

Cited by 14 publications

(18 citation statements)

References 13 publications

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“…The seed yield in onion depends on a number of factors which include vernalization, physiological age, environmental factors, bulb/set size and post-planting conditions, and type of cultivar. Quality seed yield of onion depends on genotype, locality, season, method of seed production and adequate plant protection measures [3]- [9]. Among these, the physiological age of the plant as well as temperature and photoperiod has shown to exert the most important role.…”

Section: Factors Controlling Inflorescence Initiation and Seed Stalk mentioning

confidence: 99%

“…Onions vary greatly in their floral initiation response to temperature, which can be attributed to differences in their genetical background [18] [19] [37] and to differences in their physiological age (seedling or bulb size) [9] [38] [39] at the time of induction. Onions are induced to flower by low temperatures provided they have passed the end of the juvenile phase [4] [22] [40]- [44].…”

Section: Physiological Agementioning

confidence: 99%

“…It has been found that the initiation of inflorescences is favoured by large set or bulb size [9] [31] [38] [51] [53] [67] [71] or plant size [50]. Vernalization for 20 or 40 days at high altitude (3100 m.a.s.l) was insufficient to induce flowering but with 60 days vernalization, 18%, 24% and 35% flowering was observed in the small, medium and large size bulbs of onion cv.…”

Section: Bulb/set Size and Storage Temperaturementioning

confidence: 99%

“…1800, 2100 and 3100 m.a.s.l with average temperatures of 16.4˚C, 14.5˚C and 10.9˚C, respectively had 3%, 4.5% and 70% flowering, respectively [72]. Small sets (12.5 mm diameter) showed little or no bolting, and the percentage of bolting increased with increasing set-size (17.5 to 22.5 mm) following linear relationship [9]. Sets of the spring-planted cultivar "Ailsa Craig", 4 -7 g in fresh weight (FW), initiated inflorescences, but those with a lower FW could not [56].…”

Section: Bulb/set Size and Storage Temperaturementioning

confidence: 99%

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Flowering and Seed Development in Onion—A Review

Khokhar¹

2014

OALib

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Proper vernalization temperature of mother onion bulbs stimulates early flowering and produces a heavier yield of seed. Moreover, onion cultivars seem to differ in their optimal temperature requirements depending on the locality to which they are adapted. Most studies on the effects of storage temperature on inflorescence initiation in onion have shown that the optimum temperature for flowering is in a range between 5˚C to 13˚C for 90 to 120 days and bolting resistant varieties require a longer cold stimulus (154 -185 days) in comparison to normal spring sown cultivars. Flowering is greatly reduced or suppressed at temperatures in the range of 15.5˚C -30˚C and low temperatures of −3˚C to 0˚C. Studies on both bulbs and seedlings have shown that, depending on genotype, flower initiation starts only after a juvenile phase, when the plant has a minimum number of 4 -14 leaves, including leaf initials. The initiation of inflorescence is favoured by a large set or bulb size. The post planting environmental conditions greatly affect bolting percentage of bulbs stored at an inductive temperature. Maximum seed yield in onion has been reported from large mother bulbs and early planting time. The emergence of inflorescence is faster at high temperatures (20˚C -30˚C) and long days (14 -16 hours).

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Section: Factors Controlling Inflorescence Initiation and Seed Stalk mentioning

confidence: 99%

Section: Physiological Agementioning

confidence: 99%

Section: Bulb/set Size and Storage Temperaturementioning

confidence: 99%

Section: Bulb/set Size and Storage Temperaturementioning

confidence: 99%

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Flowering and Seed Development in Onion—A Review

Khokhar¹

2014

OALib

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“…Size of set is closely to subsequent bulb yield and it has been observed that large sets produced greater yields (Khokhar, 2008a). Rizk (1997) observed that the highest sowing rate (planting density) produced a noticeably higher yield of good quality bulbs than the lower sowing rate.…”

Section: Introductionmentioning

confidence: 99%

Onion Bulbs Production Grown by Sets 1. Effect of Plant Density and Set-Size

2013

Zagazig Journal of Agricultural Research

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This study was conducted during the seasons of 2011/2012 and 2012/2013 at the Experimental Farm of Shandweel station to investigate the effect of plant density (100, 80, 60 and 40 plants/m 2 ) and set-size (10-15, 15-20 and 20-25 mm) on onion (Allium cepa L.) yield and some bulb characteristics of onion produced from sets under Sohag Governorate conditions. Results revealed that, total single bulbs and marketable yield were significantly increased at the density of 100 plants/m 2 , while culls yield, doubling and average bulb weight decreased, also bolters reduced with plant density of 40 plants/m 2 . Total marketable yields, average bulb weight and emergence were significantly increased by using large sets (20-25 mm). In the meantime, single bulbs were increased, while culls yield, doubling and bolters reduced by small sets (10-15 mm). Culls yield, bolters and bulb weight were significantly decreased by the interaction (100 plants/m 2 x small sets 10-15 mm).

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Effect of set-size and storage temperature on bolting, bulbing and seed yield in two onion cultivars

Khokhar

2009

Scientia Horticulturae

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Effect of set-size and planting time on the incidence of bolting, bulbing, and seed yield in two onion cultivars

Cited by 14 publications

References 13 publications

Flowering and Seed Development in Onion—A Review

Flowering and Seed Development in Onion—A Review

Onion Bulbs Production Grown by Sets 1. Effect of Plant Density and Set-Size

Effect of set-size and storage temperature on bolting, bulbing and seed yield in two onion cultivars

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