EFFICACY AND ECONOMICS OF EPTC IN FALLOWED SUGARCANE FIELDS.

Autor: Caceres, Jose R. Mite, Griffin, James L., Salassi, Michael E., Boudreaux, Joseph M.
Předmět:
Zdroj: Journal of the American Society of Sugar Cane Technologists; 2011, Vol. 31, p25-38, 14p
Abstrakt: Research conducted over multiple years evaluated perennial weed control with EPTC applied at 2.0, 2.9, 3.9, and 4.9 kg ai/ha and incorporated on pre-formed sugarcane beds in fallowed fields using a Lilliston® rolling cultivator or a hipper/bedder. At 30 days after application, bermudagrass control was greatest when EPTC was incorporated with a rolling cultivator. Differences in johnsongrass and purple nutsedge control between EPTC incorporated with a rolling cultivator and hipper/bedder were not observed. Averaged across incorporation methods, bermudagrass, johnsongrass and purple nutsedge control 30 days after application of EPTC at 2.0 kg ai/ha was 45%, 57%, and 34%, respectively, and control did not improve when EPTC rate was doubled. When EPTC was followed by one application of glyphosate at 2.24 kg ai/ha, bermudagrass ground cover was no more than 5% and johnsongrass control was 88 to 90% and equivalent to that of only glyphosate applied twice. In contrast, purple nutsedge was controlled 40% when EPTC at 2.0 kg ai/ha was followed by one application of glyphosate compared with 63% when only glyphosate was applied twice. An economic analysis of EPTC and glyphosate programs was performed using herbicide costs and variable costs associated with application and incorporation of EPTC and application of glyphosate. Total cost for EPTC® (Eptam ) at 2.0 kg ai/ha was $38.36 and $49.33/ha for the rolling cultivator and hipper/bedder, respectively. The lower cost for the rolling cultivator was because herbicide was applied and incorporated in the same operation whereas for the hipper/bedder, herbicide application and incorporation were separate operations. When EPTC was followed by a potassium salt formulation of glyphosate, the total cost was $18.66/ha more than when an isopropylamine salt formulation of glyphosate was used. For EPTC at 2.0 kg ai/ha incorporated with a rolling cultivator and followed by an isopropylamine salt formulation of glyphosate, the total cost was $15.30/ha more compared with only the isopropylamine salt formulation applied twice. Because the minimum rate of EPTC in a fallow program is 3.4 kg ai/ha, its economic value would be further reduced when compared with multiple applications in a glyphosate alone program, especially if an isopropylamine salt formulation of glyphosate is used. The EPTC/glyphosate programs were not effective on purple nutsedge and other control measures for purple nutsedge would need to be used in conjunction with a glyphosate program. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index