Identifier

etd-08242010-164758

Degree

Master of Science (MS)

Department

Plant, Environmental Management and Soil Sciences

Document Type

Thesis

Abstract

Research conducted over two years evaluated EPTC at 2.0, 2.9, 3.9, and 4.9 kg ai/ha incorporated on pre-formed sugarcane beds using a Lilliston® rolling cultivator and a hipper/bedder. Averaged across EPTC rates 30 days after application, bermudagrass was controlled 62% when incorporated with a rolling cultivator compared with 43% for the hipper/bedder. For johnsongrass and purple nutsedge, incorporation implements were equally effective and control with EPTC 30 days after application averaged 49 and 30%, respectively. Averaged across incorporation methods, control of all weeds 30 days after EPTC application was maximized at 3.9 kg/ha, but control was no greater than when applied at 2.0 kg/ha (45% bermudagrass, 57% johnsongrass, and 33% purple nutsedge control). EPTC treatments were followed by glyphosate at 2.24 kg ai/ha and weed control was compared with a glyphosate alone program consisting of two applications of glyphosate at 2.24 kg ai/ha. Where EPTC was applied 60 days earlier and followed by one application of glyphosate, weed control was no greater than when glyphosate was applied twice (bermudagrass ground cover no more than 5% and johnsongrass control at least 88%). In contrast, purple nutsedge was controlled 31 to 40% where EPTC was followed by one application of glyphosate compared with 63% for two applications of glyphosate. An economic analysis of EPTC and glyphosate programs was performed using herbicide costs and variable costs associated with operation of incorporation implements and herbicide application. Cost of EPTC at 2.0 kg/ha plus application and incorporation would be $38.36/ha with the rolling cultivator and $49.33/ha for the hipper/bedder. Where EPTC at 2.0 kg/ha is followed by glyphosate as Roundup Original Max®, total cost would be $18.66/ha more than where generic glyphosate is used. For EPTC at 2.0 kg/ha incorporated with a rolling cultivator and followed by generic glyphosate, total cost would be $15.31/ha more compared with generic glyphosate applied twice. In other research, EPTC applied at 2.9 to 6.8 kg/ha and incorporated at planting did not negatively affect sugarcane shoot population 35 and 186 days after planting compared with standard herbicide treatments. EPTC was ineffective on grass and broadleaf winter weeds.

Date

2010

Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Griffin,James

DOI

10.31390/gradschool_theses.1905

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