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  1. Vol. 37 No. 6, p. 1875-1877
     
    Received: Jan 2, 1997
    Published: Nov, 1997


    * Corresponding author(s): nchris@iastate.edu
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doi:10.2135/cropsci1997.0011183X003700060035x

Pendimethalin and Corn Gluten Meal Combinations to Control Turf Weeds

  1. D. S. Gardner,
  2. N. E. Christians  and
  3. B. R. Bingaman
  1. Dep. Horticulture, Iowa State Univ., Ames, IA 50011-1100

Abstract

Abstract

Concerns over ground water contamination and other environmental issues have prompted research to reduce synthetic herbicide use. Corn (Zea mays L.) gluten meal, a by-product of wet milling, inhibits germination and the establishment of many annual and perennial weed species. Our objective in the field was to investigate crabgrass control (Digitaria spp.) in Kentucky Bluegrass (Poa pratensis L.) turf established on a Nicollet soil (fine-loamy, mixed, mesic Aquic Hapludoll). In the greenhouse, we investigated the control of large crabgrass [Digitaria sanguinalis (L.) Scop.] on the same soil with no turfgrass cover. Experiments were conducted with corn gluten meal at 0, 49, 98, and 147 g m−2 combined in a factorial arrangement with pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] at 0, 29, 59, 88, and 117 mg ai m−2. The minimum label rate for pendimethalin is 176 mg ai m−2. Field crabgrass control was improved by application of a sublethal rate of pendimethalin in addition to corn gluten meal. As the application rate of corn gluten meal increased from 49 to 147 g m−2, the level of pendimethalin required to provide 75 to 85% control for 15 wk decreased from 88 to 29 mg ai m−2. There was no increase in crabgrass control in plots that received amounts of corn gluten meal and pendimethalin exceeding these combined rates.

Contribution as Journal Paper No. J-17185 of the Iowa Agric. and Home Econ. Exp. Stn.; Project No. 3401, and supported by Hatch Act and State of Iowa funds. Mention of product and equipment trade names is for identification purposes only and does not imply a warranty or endorsement to the exclusion of other products that may be similar.

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