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Winter Annual Weed and Early Spring Insect Control Using Propane Flaming in Dormant Alfalfa

Experimental Design

Two experiments were set up in a seven-year-old alfalfa field located 8 miles north of Strasburg, Colorado, on the east bank of Kiowa Creek. This dryland alfalfa field receives water by subirrigation from the Kiowa creek natural water flow (Figure 1).

Treatments

The treatments for Experiment I (Early Application of Herbicide) include:

      1. Spring flaming at 4 mph (quick flaming) applied on March 21, 2001.

      2. Pursuit DG at 1.44 oz per acre applied on March 21, 2001.

      3. Baythroid at 2 oz per acre applied on May 7, 2001.

      4. Pursuit DG at 1.44 oz per acre applied on March 21, 2001, followed by Baythroid at 2 oz per acre applied on May 7, 2001.

      5. Untreated check.

The treatments for Experiment II (Late Application of Herbicide) include:

      1. Spring flaming at 3 mph (slow flaming) applied on March 21, 2001.

      2. Pursuit DG at 1.44 oz per acre applied on April 18, 2001, followed by Baythroid at 2 oz per acre applied on May 7, 2001.

      3. Pursuit DG at 1.44 oz per acre plus (10-34-0)* at 10 gals per acre applied on April 18, 2001, followed by Baythroid at 2 oz per acre applied on May 7, 2001.

      4. Baythroid at 2 oz per acre applied on May 7, 2001.

      5. Untreated check

*Phosphate fertilizer (10-34-0) was added to Pursuit herbicide to determine if phosphorus levels in the soil would increase using this type of weed and feed program.

Experiment I and Experiment II were randomized in a complete block design using 3 replicates each. Data was analyzed using ANOVA with a protected LSD.

A rain gauge was installed on-site to monitor precipitation during the course of both experiments (Figure 2).
 
 

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