Our farmer neighbor came over today and offered to farm our field this year in soybeans. It has lain idle the past few years, before that it was hay. He wants to plant the beans, then spray roundup after they've grown a bit, to kill the weeds. c. Our barn the chickens call home is close to the field. My question is will the Roundup hurt them if they should wander into the field.? (they are free range) Actually, there's no if...I know they will venture in. And, soybeans are not toxic to them, are they?