Chemical selector

Crop type: Sorghum
Application type: Preplant or Preemergence

Pounds of active ingredient per acre
Atrazine 1.6 or 2
Product quantity per acre
1.6 to 2 qt Atrazine 4L, or 1.8 to 2.2 lb Atrazine 90DF
Comments and limitations

A restricted-use pesticide. It can injure sorghum on calcareous soils. Controls small-seeded broadleaf weeds best and suppresses annual grasses and large-seeded broadleaf weeds. Preplant incorporate or apply after planting but before sorghum emerges. In sensitive watersheds, atrazine best management practices suggest that soil surface applications at sorghum planting time should not exceed 1 lb/acre because of high potential for runoff losses. Do not use on coarse-textured soils or other soils with less than 1% organic matter. Choice of rotational crops depends on atrazine rate, soil pH, and time of application. Follow atrazine rate limits and label directions. No-till: Atrazine can be applied to Kansas row-crop stubble from fall harvest to December 31 to control winter annual weeds and reduce the need for burndown herbicide application or preplant tillage in spring on fields to be planted to sorghum. Apply with COC to enhance foliar activity. Tank mixing with 2,4-D LVE and/or dicamba enhances control of dandelion and other broadleaf winter annual weeds. Can be tank mixed with Gramoxone SL to enhance control of cheat, downy brome, and Japanese brome. For highly erodible soils with less than 30% plant residue cover, limit fall application to a maximum of 1.6 lb. Total atrazine applications must not exceed 2.5 lb/acre per calendar year. Do not apply to frozen ground or where soil surface conditions favor wind erosion. Do not plant any crops except corn, grain sorghum, or forage sorghum in the following spring. Follow directions on 24(c) Special Local Need label for Kansas.

The Pesticide Selector includes suggestions for chemical control of pests in Kansas crops, which are provided by K-State Research and Extension, and may not be relevant for states other than Kansas. We will continue to expand this tool for help in selecting other types of agricultural chemicals, and for other states. Contact the myFields Team if you are interested in contributing content!

The herbicide performance ratings are taken from: C.R. Thompson, D.E. Peterson, W.H. Fink, P.W. Stahlman, and J.W. Slocombe. 2020. Chemical Weed Control for Field Crops, Pastures, Rangeland, and Noncropland, Kansas State University, January 2016. Contribution no. 16-029-S from the Kansas Agricultural Experiment Station. Find it online at the bookstore.

The insecticide recommendations are taken from: B.P. McCornack, S. Zukoff, R.J. Whitworth, J.P. Michaud, and H.N. Schwarting. 2019. Insect Management Guides. March 2018. Kansas State University Agricultural Experiment Station and Cooperative Extension Service. PDF formats are available here.

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