While improving the nutrient use efficiency of all crop nutrients falls within 4R Ontario, additional emphasis will be placed on nitrogen (N). Canada has committed to reducing greenhouse gas (GHG) emissions and Agriculture and Agri-Food Canada (AAFC) is examining a voluntary commitment to reduce nitrous oxide (N2O) emissions from nitrogen fertilizer applications by 30 per cent. With these known targets, there is an opportunity for the 4Rs, as a science-based practice for reduced nutrient loss, along withGHGemission reductions to help meet broader goals. This agreement also will be looking to set short-term targets for the 4Rs in Ontario which could include goals for acres, farmers, and agri-retailers participating in the program by 2025. A large focus will be on communication and outreach, both to the farmer and the agri-retailer to further scale the program. The 4Rs are constantly evolving, just like the agreement with our partners — it is about improving and adapting to a changing environment. The 4Rs in Ontario is about using the best information and science to make informed decisions on what you are applying, when you are applying, and how much you are applying to optimize nutrient use efficiency. The 4Rs is as much about minimizing impact to the environment as it is about maximizing profitability and when those two things happen, everyone wins. Michael Buttenham is the environment and sustainability lead at Grain Farmers of Ontario. l ONTARIO GRAIN FARMER 19 APRIL/MAY 2022 2,451 farmers are participating in the 4R Certification Program with their agri-retailer, covering just under one million acres across the province, and 28 full-service agri-retail locations have completed full certification in Ontario. Shieldex ® 400SC Herbicide is the latest Group 27 herbicide available for 昀eld, seed, sweet and popcorn growers. Independent research has shown that the active ingredient tolpyralate, as part of a comprehensive herbicide program, provides the most consistent control of important broadleaf and grassy weeds in corn. • Excellent control of Canada Fleabane, Waterhemp, Lamb’s Quarters, Pigweed, Green Foxtail, Barnyard Grass & much more! • A highly compatible re-cropping pro昀le following the year after application. • Good tank-mix compatibility and an excellent 昀t with atrazine Post Emergent Control of G27 Corn Herbicides 2 Weeks after Application Lambs Quarters Shieldex + Atrazine (30 + 1000g ai/ha) Armezon + Atrazine (12+ 500g ai/ha) Callisto + Atrazine (100 + 280g ai/ha) Velvet Leaf Pigweed Common Ragweed Lady’s Thumb Wild Mustard Green Foxtail Barnyard Grass 100 80 60 40 20 % CONTROL University of Guelph Ridgetown College (2015-17) KILLS THE WEEDS THAT MATTER GOWANCANADA.COM Shieldex is a registered trademark of Ishihara Sangyo Kaisha, Ltd. Always read and follow label directions.