T OP CROP MANAGER PLANT BREEDING 6 | New DON toxin standards awaited Standards for deoxynivalenol (DON) levels in wheat and other products are still under review. By Heather Hager, PhD 14 | Diverse plant sources tapped for disease resistance in wheat A sense of urgency is driving many of the searches, both near and far. By Carolyn King CROP MANAGEMENT Know. Grow. OctOber 2011 • eastern editiOn FERTILITY AND NUTRIENTS 30 | Addressing the soil K decline Regional declines in soil potassium (K) highlight the importance of maintaining fertility checks and balances. By Heather Hager, PhD 10 | Increased interest in double-cropping soybeans The conditions have to be right, but the benefits can be surprising if it works. By Blair Andrews 26 | Heavier corn residue is the new reality The quantity of corn residue is increasing, and managing it is ma must. 10 There is considerable uncertainty about stringent DON levels. Photo by Bruce Barker. PhOTO cOuRTesy Of DR. Kelly TuRKiNgTON, agRiculTuRe aND agRi-fOOD caNaDa. 18 22 oneer.i MANAGEMENTi PLANT BREEDING TILLAGE AND SEEDING PhOTO By RalPh PeaRce. FROM THE EDITOR 18 Expiry of patent on Roundup Ready technology Growers need to understand the timeline and any conditions for saving and growing off-patent seed. By Blair Andrews arriving soon Dow AgroSciences develops Enlist Weed Control System for corn, soy and cotton. By Donna Fleury 28 Taking the ‘PAC’ out of compaction The wet spring of 2011 left most soils with some degree of the problem. By Rosalie I. Tennison 4 It’s not new; it’s evolving New design, new look, but the same commitment to quality. By Ralph Pearce PESTS AND DISEASES oneer. 34 2,4-D herbicide-tolerant crops ON THE COVER: 20 Staying ahead of nematodes Much-needed new methods of con-trol coming to the Canadian market in the near future. By Treena Hein BUSINESS 22 Study of large commercial producers Extensive survey was done for retailers, but growers can learn plenty. By Ralph Pearce 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 | October 2011 3 PhOTO By RalPh PeaRce.