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Reduced Herbicide Rates for Narrow-Row Silage Corn 1997

Project Leader: Russell R. Hahn

Objective:

Evaluate weed control and corn silage yields in 15- and 30-inch rows at two plant populations (30,000 and 45,000/acre) with full (labeled), two-thirds, and one-third rates of appropriate herbicide combinations for PRE control for velvetleaf and other annual weeds and for EPO control of yellow nutsedge and annual weeds.

Results:

Row spacing and plant population had no influence on weed control ratings. As a result, weed control ratings and silage yields for the herbicide treatments have been averaged across row spacings and plant populations. In the PRE study, the Prowl-plus-atrazine combination provided the following weed control results:

1. 95-100% control of redroot pigweed, common lambsquarters, and wild mustard at all rates

2. 95% control of velvetleaf at the full rate, 88% at the two-thirds rate, and 66% at the one-third rate

3. 99% control of ragweed at the full rate, 91% at the two-thirds rate, and 67% at the one-third rate

4. 98% control of green foxtail at the full rate, 93% at the two-thirds rate, and 85% at the one-third rate

There were no significant differences in silage yields among the three herbicide treatments.