Total nonstructural carbohydrate (TNC) flux of creeping bentgrass receiving sequential applications of growth retardants
Han, Sang-Wook
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https://hdl.handle.net/2142/21201
Description
Title
Total nonstructural carbohydrate (TNC) flux of creeping bentgrass receiving sequential applications of growth retardants
Author(s)
Han, Sang-Wook
Issue Date
1996
Doctoral Committee Chair(s)
Fermanian, Thomas W.
Department of Study
Crop Sciences
Discipline
Crop Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Agronomy
Biology, Plant Physiology
Language
eng
Abstract
Turfgrass growth retardants, trinexapac-ethyl, flurprimidol and paclobutrazol were treated in an initial greenhouse study but only trinexapac-ethyl was included in subsequent field and greenhouse experiments. Applications of trinexapac-ethyl (0.28 kg ha$\sp{-1}),$ flurprimidol (0.56 kg ha$\sp{-1}),$ and paclobutrazol (0.28 kg ha$\sp{-1})$ once, every 2 and 4 weeks during an 8 week period increased verdure TNC of creeping bentgrass 2 WAT in the greenhouse experiments. However, TNC content of treated turfs was significantly lower than untreated control from 6 weeks after an initial application both in greenhouse and field studies.
Flurprimidol or paclobutrazol showed little impact on root TNC levels of creeping bentgrass. Trinexapac-ethyl treatments significantly increased TNC content in the root in most of the evaluations in the first greenhouse experiment but had no effect in the second greenhouse and field studies. Creeping bentgrass treated with trinexapac-ethyl, flurprimidol, and paclobutrazol had significantly greater root dry weight in the first greenhouse study but there were no differences in the field or second greenhouse studies. When trinexapac-ethyl was applied at various rates and time intervals in the second greenhouse and field study, frequent applications at high rates generally exhibited greater impact on verdure TNC.
Multiple applications of trinexapac-ethyl at two week intervals during the first 8 weeks exhibited effective suppression of top growth of creeping bentgrass in the field experiment depending upon the application rate. Trinexapac-ethyl applied every 2 weeks at 0.06 kg ha$\sp{-1}$ reduced clipping production an average of 42% during a 10 week period and provided more consistent suppression of top growth compared to turfs receiving trinexapac-ethyl on 4 week intervals at 0.09 kg ha$\sp{-1}.$ Every 2 week applications of trinexapac-ethyl at 0.28 kg ha$\sp{-1}$ showed the highest level of suppression, up to 75% of normal growth, but significantly reduced turf quality below an acceptable level. When photosynthesis and respiration rates were measured following application of trinexapac-ethyl on greenhouse-grown creeping bentgrass, there were no differences in either rate from untreated controls.
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