“Do we need to till or not?” Purdue University weed scientist Bryan Young often hears this question from Midwest soybean growers fighting herbicide-resistant marestail, waterhemp and Palmer amaranth. In parts of the south, multi-herbicide-resistant Palmer pigweeds have forced growers to include or intensify tillage, Young says. Likewise, in western Kansas, glyphosate-resistant kochia has led some dryland wheat growers to resort to tillage. But before Midwest farmers put steel to ...

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