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Weeds can reduce soybean yield by 1% per day if left uncontrolled after the V2 to V3 stage of soybean growth. University research shows that weeds emerging with the crop should be removed by the V2 or V3 stage of soybean development, when weeds are less than 4 inches tall, to minimize yield loss due to weed competition. Pre-emergence residual herbicides with a planned POST application is the best approach to avoid losses from early season weeds.
Read more about weed competition with Soybeans at RoundupReadyPLUS.com.