| Type of Document |
Dissertation |
| Author |
Orgeron, Albert Joseph
|
| URN |
etd-11072012-134904 |
| Title |
Sugarcane Growth, Sucrose Content, and Yield Response to the Ripeners Glyphosate and Trinexapac-ethyl |
| Degree |
Doctor of Philosophy (Ph.D.) |
| Department |
Agronomy & Environmental Management |
| Advisory Committee |
| Advisor Name |
Title |
| Griffin, James |
Committee Chair |
| Legendre, Ben |
Committee Co-Chair |
| Gravois, Kenneth |
Committee Member |
| Hoy, Jeffery |
Committee Member |
| Miller, Donnie |
Committee Member |
| Larkin, John |
Dean's Representative |
|
| Keywords |
- sugarcane
- sugarcane ripeners
- glyphosate
- trinexapac-ethyl
|
| Date of Defense |
2012-11-05 |
| Availability |
unrestricted |
Abstract
Under Louisiana climatic conditions, production of sugarcane (Saccharum spp.) is limited to a maximum growth period of nine months. To increase sucrose concentration in the crop, ripener is applied prior to harvest. The chemical ripeners, glyphosate and trinexapac-ethyl were applied to the sugarcane cultivars HoCP 96-540, L 99-226, L 99-233, HoCP 00-950, and L 01-283 eight weeks prior to harvest. When glyphosate was applied at 210 g ae/ha, TRS for the cultivars was increased 10 to 28% compared with the nontreated. Increases in TRS with glyphosate were greatest for HoCP 96-540 and L 99-226 and least for HoCP 00-950 and L 01-283. Trinexapac-ethyl at 350 g ai/ha increased TRS for the cultivars 7 to 10% and increases were greatest for L 99-233 and least for HoCP 00-950. Sugarcane yield averaged across cultivars was reduced 9% with glyphosate and 7% for trinexapac-ethyl at 350 g/ha. An increase in sugar yield per hectare, a function of TRS and sugarcane yield, was observed only when glyphosate was applied to HoCP 96-540 (16% increase) and when trinexapac-ethyl at 300 g ai/ha was applied to L 01-283 (13% increase). In a second study where eight cultivars were harvested six weeks after glyphosate application, TRS for HoCP 96-540 was increased an average of 10% compared with the nontreated and sugarcane yield was decreased 17%; sugar yield was not affected.
In another study, sugarcane yield, TRS, and sugar yield were not affected by nitrogen rates of 67, 112, and 157 kg/ha. Six weeks after application of glyphosate at 210 g/ha TRS averaged across N rates was 11% greater than the nontreated and 9% greater than when trinexapac-ethyl was applied at 350 g/ha. TRS following trinexapac-ethyl was equivalent to the nontreated. Sugarcane yield and sugar yield were not affected by ripener application. In a separate study TRS and sugar yield were not affected when glyphosate or trinexapac-ethyl was applied in 75 and 150 L/ha spray volume or when none or 0.25% v/v surfactant was added to the spray solution. Averaged across spray volume and surfactant treatments, TRS was as much as 8% greater for glyphosate compared with trinexapac-ethyl.
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
| |
Orgeron_diss.pdf |
322.94 Kb |
00:01:29 |
00:00:46 |
00:00:40 |
00:00:20 |
00:00:01 |
|
