Soybean School: How Long Do I Need to Keep Soybeans Weed Free?

Start clean, stay clean is a smart motto when it comes to corn and soybean fields, but what’s the right amount of “clean” in relation to weed cover and yield potential?

Dr. Peter Sikkema, professor of plant science with the University of Guelph — Ridgetown Campus, took to the field to answer that question. If, as you walk your soybean fields shortly after the second trifoliate is out, you notice weeds beginning to germinate and grow, do you leave them or do you spray? What’s the impact of those late-germinated weeds on yield?

Want more Soybean School episodes? The entire library is at this link.

In the Soybean School below, Sikkema answers that question, and then goes on to explain other factors that may also sway your decision of another spray pass — things like harvest ease and weed seed bank management. What’s more, he adds in a quick tip for those with corn in the rotation, too.

Don’t miss a post from Real Agriculture! Follow this link to subscribe to our email updates (free and customizable!)


RealAgriculture Agronomy Team

A team effort of RealAgriculture videographers and editorial staff to make sure that you have the latest in agronomy information for your farm.


Wheat prices jump into August — This week in the grain markets

This week, winter wheat prices touched a three-year high, but it didn’t last. Chicago SRW wheat prices for September 2018 gained 5 per cent or about 26 cents US/bushel to close at $5.56. While the December 2018 contract was up 5.4 percent — or nearly 30 cents — to finish a tad under $5.80. In…Read more »


Leave a Reply


This site uses Akismet to reduce spam. Learn how your comment data is processed.