Weed Survey — Postplant
Soon after planting, survey the cornfield to identify germinated weeds. Weeds compete with corn for light, nutrients, and water, especially during the first 3 to 5 weeks following emergence of the crop. Getting a realistic picture of the weed species present, their growth stage, and numbers is necessary for determining the best management methods, especially before corn stalks are 6 to 8 inches high, which is when weeds begin to impact corn yields.
Recording weed survey results assists in weed management decisions, including if management is needed, herbicide choice, and cultivation practices. Information collected over a period of years tells you how weed populations are changing and how effective your management operations have been.
How to survey
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