Ralls, Crosby County

Systems Agronomic and Economic Evaluation of Transgenic and

Conventional Varieties in the Texas High Plains

February, 2001

Dr. Randy Boman, Extension Agronomist-Cotton

Mr. Mark Kelley, Extension Assistant-Cotton

Mr. Alan Helm, Extension Assistant-Cotton

Texas Agricultural Extension Service

Lubbock, TX

High Weed Control Input Site

Dr. Bill Lyle Farm, Ralls (Crosby County)

Strip-tillage following sorghum

Irrigation: LEPA, circular rows

Plot Size: 8 40-inch rows/plot

Area: Variable (1.0 to 2.5 Acres/Plot), 3 replications of each variety

Planted: May 8, 2000 at 14 lb seed/Acre

Harvest aid program: September 27 – 3 pt/acre CottonQuik + 6 oz/acre Ginstar (no follow-up Cyclone

application was required)

Harvested: October 11-19, 2000 (before significant weathering occurred)

Blanket Herbicide Program: $47.10/acre

Dominant weed species: pigweed, silverleaf nightshade, volunteer peanut, groundcherry, volunteer and ratoon sorghum

The area was strip-tilled following sorghum. Treflan at 1.5 pt/acre was incorporated on a 50% band (top of the bed). Roundup Ultra was applied at 1 qt/acre applied at planting to terminate existing weeds and volunteer sorghum. Due to incomplete ratoon sorghum control, an additional 24 oz/acre of Roundup Ultra was applied on May 11. Hot, dry, and dusty conditions resulted in poor control of sorghum with Roundup Ultra. Therefore, an additional application of 12 oz/acre Fusion plus 1% COC was applied on May 31 to complete termination of the ratoon sorghum. The total cost of the blanket herbicide program was $47.10/acre (Table 2).

Specific herbicide systems costs included:

BXN and conventional varieties: 1 qt/acre of Cotoran 4L was applied on May 11.

Roundup Ready varieties: 1 qt/acre Roundup Ultra + 17 lb Strike Zone/100 gallons of spray on June 9.

BXN variety: 1 pt/acre Buctril + 0.5% COC on June 10.

Post-directed application on Roundup Ready varieties: 1.5 pt/acre Roundup Ultra plus 1.5 pt/acre Direx on July 21.

Post-directed application on BXN and conventional varieties: 1.5 pt/acre Direx on July 21.

Pix: 12 oz/acre applied to BXN 47 on August 3

Non-Roundup Ready varieties were cultivated one time. Roundup Ready varieties were not cultivated. Hoe costs were $6.60, $6.60, and $20.00 per acre for Roundup Ready, BXN, and conventional herbicide systems, respectively.

No insecticides were applied to the project due to lack of economic infestation levels. This location was not in an active boll weevil eradication zone.

Varieties planted at this site included:

1. Paymaster HS 26

2. Paymaster 2326RR

3. Paymaster 2326BG/RR

4. Paymaster 280

5. Paymaster 2200RR

6. Paymaster 2280BG/RR

7. Stoneville 4892BR

8. Stoneville BXN 47

9. FiberMax 989

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