A cool, wet spring has slowed fieldwork and dreams of early planting appear to be disappearing as the calendar turns to May.

But the backward conditions have not stalled weed growth in fields across Ontario. That means growers will need to keep a close eye on winter annuals and mounting weed pressure in soybean and corn fields, says BASF agronomist and technical development manager Rob Miller.

On this episode of the RealAgriculture Soybean School, Miller scouts fields at BASF's Maryhill, Ont., research site to find weeds emerging and actively growing under crop residue. "Aggressive and timely scouting is going to be key this year. We alway want to spray weeds when they are smaller and actively growing," he says.

Some weed species, such as waterhemp, can grow up to one inch per day. "If we delay scouting by two or three days that weed has grown by two or three inches and will be tougher to control," Miller says. Early scouting also helps ensure growers don't end up in a situation where they have to "plant now and spray later."

Miller notes that soil-applied, residual weed control can only be applied pre plant or pre emerge. If growers can get soil applied chemistry down early, they'll get good control. "You don't want that crop coming out of the ground, getting ahead of you, and the weeds coming up the same time."

#farming #soybeans #agronomy #weed

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