16. Summary for establishment effects on alfalfa density Weeds can reduce stand density Be careful especially if planting Planting lower alfalfa densities Have high weed pressure Competitive weeds species in field Dry conditions that reduce alfalfa emergence Management can alleviate some of the loss Many tools available Allow for scouting and POST application
33. Controlling volunteer wheat in summer seeding alfalfa alfalfa no-till drilled at 13 lbs/A 8/18/2008 8/15/2009 Densities wheat 12-49 plants /ft2 7-94 plants /ft2 Mid September Poast at 1.5 pt/A to ½ of the plots. Wheat: 6-8 inches tall Alfalfa 4-6 trifoliate leaves 4-5 inches tall
34. Response of alfalfa density and yield from volunteer wheat 2008-09 = 12- 49 plants/ft22009-10 = 7-94 plants/ft2 4-5 plants/ft2 is minimum threshold, but would like to have 30 plants/ft2
36. Does volunteer wheat reduce establishment and yield? ESTABLISHMENT: Yes; 3 to 5 more plants/ft2 in untreated plots than treated. YIELD: Total yield is higher in untreated (42-69%), but % alfalfa can be reduced. FORAGE QUALITY: Untreated reduced quality needed for dairies.
63. Costs and benefits of Roundup Ready alfalfa Benefits: herbicide is cheap Roundup ($5-10) vs Pursuit/Raptor ($15-21) Application timing is flexible to crop, but 1 application needed Avoid potential yield loss from standard treatments Can apply to larger weeds and eliminate Control ALS resistant weeds Convenient Costs: Expensive $125/50 lbs bag technology fee Seed costs will be 2x nonproprietary varieties Will need to make a herbicide application No residual weed control May increase potential for glyphosate resistant weeds Future litigation and regulation?
70. User can change data specific for a field or farm and provide a more accurate analysis of the costs. http://www.uwex.edu/ces/forage/pubs/economics_RR_alfalfa.xls
71. What ADDITIONAL herbicide options do I have in established crops? * For common crops (Corn, Soybeans, wheat)