Graduate Thesis Or Dissertation
 

The chemical curing of Oregon Danvers onions

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  • Pre-harvest foliar desiccation of Yellow Globe Danvers onions was investigated as a means to improve harvest procedure and to reduce storage losses. Foliar desiccation tended to increase storage disease and sprouting incidence versus the untreated controls. Paraquat approximately doubled storage disease in both years. Stoddard solvent and ethephon increased disease in lesser amounts. Endothall at 1.1 kg a.i./ha gave disease results equal to the control. Root sprouting increased with most treatments but not to such a degree as to compromise commercial value. Neck moisture was efficiently lowered by most desiccant treatments but the final neck moistures achieved by the treatments did not correlate with subsequent disease or sprouting. Phenolic concentration in neck tissue was studied for several treatments and a weak negative correlation was found with subsequent disease in storage. Bulb size did not appear to be affected by the desiccant treatments. A study of mineral redistribution in untreated bulbs during the top senescence process in the month preceding harvest showed that nitrogen declined in neck tissue by 50% and in leaf tissue by 25%. Phosporus and zinc also declined in both tissues by 50% or more. Potassium declined in leaf tissue by ca. 50% but showed a 25% accumulation in neck tissue. Calcium and boron more than doubled in neck tissue and increased at a slightly lower rate in leaf tissue. Copper increased ca. 50% in both organs. Iron and aluminum showed a strongly correlated accumulation pattern in both tissues, accumulating at rates in excess of 500%. Magnesium and manganese showed no consistent change in concentration.
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Déclaration de droits
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