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Optimizing Sulphur Delivery to Sub-irrigated, Pot-grown Chrysanthemums

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Title: Optimizing Sulphur Delivery to Sub-irrigated, Pot-grown Chrysanthemums
Author: Sutton, William
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Shelp, BarryBozzo, Gale
Abstract: Greenhouse floriculture operations pose significant environmental risk due to the extensive use of fertilizer inputs and the generation of nutrient-rich wastewater. Here, we tested the hypothesis that sulphur (S) use efficiency of sub-irrigated, pot-grown chrysanthemums varies with supply and timing of S application. Two split-plot experiments (four blocks) were conducted with disbudded chrysanthemums grown under greenhouse conditions with S treatment (2.25 mmol L-1 supplied continuously over the crop cycle or 2.25, 1.125 and 0.5625 mmol L-1 S supplied during vegetative growth only) as the main plot and cultivar (‘Olympia’ and ‘Covington’) as the sub-plot. Morphological characteristics of plants with fully-expanded inflorescences were unaffected by S treatment. Construction of S and dry mass budgets revealed that S use efficiency increased significantly in both cultivars with decreasing S supply over the crop cycle. This study indicates that S delivery over the crop cycle can be markedly reduced, compared to typical commercial recommendations.
Date: 2019-01
Rights: Attribution-ShareAlike 4.0 International
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Attribution-ShareAlike 4.0 International Except where otherwise noted, this item's license is described as Attribution-ShareAlike 4.0 International