T OP CROP MANAGER CEREALS KNOW. GROW. FEBRUARY 2017 • EASTERN EDITION FERTILITY AND NUTRIENTS FERTILITY AND NUTRIENTS 10 | Searching for drought-tolerant wheat Scientists are hunting high and low for a wheat variety that can perform well under drought stress, as well as in normal conditions. By John Dietz 18 | Measurement made easier Using root and stem measurements to identify better agronomic practices and better breeding lines. By Carolyn King 24 | Improving corn N recommendations Working towards more precise nitrogen fertilizer recommendations for corn in Ontario. By Helen Lammers-Helps 10 18 24 Damage due to northern corn leaf blight, the most severe leaf disease of corn in Ontario. Photo courtesy of Krishan Jindal. FROM THE EDITOR 4 SPECIAL CROPS Preserving gains in corn yields By Stefanie Croley Northern corn leaf blight, grey leaf spot top Ontario corn diseases By Julienne Isaacs Sorghum’s encore By Rosalie Tennison 14 Stover and straw for sugar-based biochemicals By Carolyn King FERTILITY AND NUTRIENTS CROP MANAGEMENT 26 Putting corn hybrids to the test By Julienne Isaacs MACHINERY PESTS AND DISEASES 5 22 Biochar: a quick fix for taxed soil? By Julienne Isaacs 28 The 2017 Canadian Truck King Challenge By Howard J. Elmer PLANT BREEDING 8 ON THE WEB CANADIAN PRODUCERS BENEFIT FROM 2016 DROP IN LOONIE: BMO Foreign exchange developments have yielded very different experiences for producers in Canada and the United States, according to the BMO 2016 North American Agriculture Report. ON THE COVER: TopCropManager.com Readers will find numerous references to pesticide and fertility applications, methods, timing and rates in the pages of Top Crop Manager. We encourage growers to check product registration status and consult with provincial recommendations and product labels for complete instructions. TOP CROP MANAGER east | February 2017 3 PHOTO COURTESY OF MEHDI SHARIFI, PHOTO COURTESY OF BAO-LUO MA. PHOTO BY JOHN DIETZ.