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Reaction of onion, Allium cepa L. and pinto bean, Phaseolus vulgaris L. to ozoneEngle, Ronald L. January 1966 (has links)
Thesis (Ph. D.)--University of Wisconsin, 1966. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliography.
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Nitrogen-mustard induced variability in Pyrenochaeta terrestrisGasiorkiewicz, Eugene C., January 1951 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1951. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 49-51).
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Factors influencing the development of white rot, caused by Sclerotium cepivorum, on Allium speciesYuran, Gene Thomas. January 1981 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1981. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 53-57).
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Pollination and seed production studies in inbred and hybrid onionsErickson, Homer T. January 1954 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1954. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 91-93).
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Cultural methods for dehydrating onion production in Quebec, with particular reference to the fluid drilling techniqueCrévier, Hélène A. January 1986 (has links)
No description available.
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Annual weed competition and management for direct-seeded onion /Bannon, Carl D. 01 January 1988 (has links) (PDF)
No description available.
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The epidemiology of leaf blight diseas of onions incited by Botrytis squamosa.Small, Lyall W. January 1970 (has links)
No description available.
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The effect of daylength and temperature on growth and 'onset of bulbing' in tropical cultivars of onion.Tesfay, Samson Zeray. January 2005 (has links)
Onions are widely produced within the tropics, but little scientific research has been done
specifically on the Eritrean cultivars, like Hagaz Red 1 and 2 (HR I, and HR 2). Many onion
cultivars are limited in their range of adaptation due to the combined effects of photoperiod
and temperature. A priority for research on the crop was to elucidate the local crop's growth
response to environmental conditions, particularly temperature and daylength.
The Eritrean cultivars HR I and 2 and an American (Louisiana) cultivar Red Creole (RC)
grown in South Africa were grown in growth rooms under all combinations of three
daylengths (11.5h, 12h, 12.5h) and three day/night temperatures (25/12°C, 30/15°C and
35/18°C). Growth responses were determined at 108 days and by using a growing degree day
(GDD) base. A broken-stick regression model was used to determine the points of inflection,
indicating the initiation of bulbing. Based on leaf area and plant height data, mathematical
differentiation equations and coefficient of determination (R2) were applied to determine the
base temperature (6.4°C) for these particular cultivars.
All three cultivars needed at least 12 h daylength for bulb initiation when assessed by a
bulbing ratio >=2.0. A bulbing ratio >=2.0 characterizes the onset of bulbing. Under a 11.5 h
daylength, a temperature higher than 25/12°C decreased vegetative growth. Temperature in
this region may be a supra-optimal condition for the growth of these cultivars at this
daylength. However, the 25/12°C and 30/15°C temperatures were found to be ideal for onion
bulb production under 12 hand 12.5 h daylengths. The three cultivars (HR I, HR 2 and RC)
showed very similar growth response to the daylength and temperature interactions.
The thermal presentation of plant growth indicated that there were relationships between bulb
initiation and rate of leaf area growth under inductive conditions (12 hand 12.5 h). Under the
12 h daylength, cultivars needed 343, 482, and 597 GDD units before bulb initiation and 405,
432, and 431 GDD to increase the rate of leaf area development at 25/12°C, 30/15°C, and
35/18°C, respectively. Under a 12.5 h daylength, these cultivars needed 344, 423, and 432.2
GDDs to initiate bulbing and 140, 411, and 579 GDDs to increase leaf growth rates at
25/12°C, 30/15°C, and 35/18°C, respectively. In the 12 h daylength, bulbing was initiated
and followed by an increased rate of growth of leaf area. However, the reverse happened for
the 12.5 h daylength. Overall, where plant response to temperature can be expressed as the
rate of progress towards a morphogenetic change, GDD values can be used to predict a plant
developmental stage at a particular temperature. It must be concluded that temperatures
induced significant variations in growth components (leaf number, plant height, leaf area),
and affected bulbing response.
The findings in this study confirmed that the cultivars require only a certain fixed amount of
thermal time for their development at a particular temperature, and that, if anything, the slow
growth rate at the higher temperature must be due to supra-optimal temperatures. They also
require a minimum 12 h photoperiod for bulb formation. / Thesis (M.Sc.Agric.)-University of KwaZulu-Natal, Pietermaritzburg, 2005.
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Thrips Control on OnionsRethwisch, Michael D. 05 1900 (has links)
No description available.
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Control of Thrips in Seed Onions and Resultant Seed YieldsRethwisch, Michael D., Daily, Bill, Sanderson, David, McDaniel, Charles 12 1900 (has links)
Four insecticides were evaluated for their effect on onion seed production in Yuma County where two species on thrips (western flower and onion) were present in seed fields. Visual differences between treatments resultant from onion thrips damage was evident within 10 days after treatments were applied at flower opening. Lorsban, Ammo and Capture treatments provided control of onion thrips based on condition of seed heads. Only Ammo and Capture treatments increased seed yield as the Lorsban treatment was thought to repel bees which are needed for pollination. Pyrethroid treatments yielded 40% more than the untreated check. Damage from onion thrips to onion seed in Yuma County is conservatively calculated to currently be at least $1.1 million annually.
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