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  • species
  • Field trials were conducted in 2002-2008 to establish methodology for infecting and assessing the reaction of wild perennial sunflower species to sclerotinia, to understand the epidemiology of the Sclerotinia infections to wild sunflower heads and stems, and to identify sources of resistance. (usda.gov)
  • genes
  • Present research is focusing on studying the inheritance of the genetic resistance and the transfer of the resistance genes to sunflower breeding lines for future hybrid development. (usda.gov)
  • varieties
  • The big sunflower varieties are too primal for my tastes, but the smaller ones still tower over the late-summer garden in their ability to glow in the face of the heat and humidity. (sacbee.com)
  • yellow
  • Single yellow sunflowers from late September. (avondalenursery.co.uk)
  • Sunflowers, with their massive yellow flower heads surmounting a single stem and the ability of the young heads to track the sun, have attracted attention since they were introduced to Europe from the Americas in the early sixteenth century," he writes. (sacbee.com)
  • nitrogen
  • I haven't had much time to think about guilds (perennial staples) , but I would obviously mix one nitrogen fixer with non nitrogen fixers, at the different layers. (permies.com)
  • root
  • Nutrient cycling efficiency: Because perennials more efficiently take up nutrients as a result of their extensive root systems, reduced amounts of nutrients need to be supplemented, lowering production costs while reducing possible excess sources of fertilizer runoff. (wikipedia.org)
  • Perennial grain- More extensive root systems allow for more efficient water and nutrient uptake, while reducing erosion due to rain and wind year-round. (wikipedia.org)
  • time
  • By the time they are mature, sunflowers generally face east. (wikipedia.org)
  • Perennial rice- Currently in the development stage using similar methods to those used in producing the perennialized sunflower, perennial rice promises to reduce deforestation through increases in production efficiency by keeping cleared land out of the fallow stage for long periods of time. (wikipedia.org)
  • different
  • Either way, you will want your perennials somewhere, as stated above, and filling your protein, starch and oils needs, preferably with each crop providing harvest at different times of the year, and also by filling their different layer niches (trees, climbers, ground covers. (permies.com)
  • University
  • The Perennialization Project: Perennials as a Pathway to Sustainable Agricultural Landscapes in the Upper Midwestern U.S". The Perennialization Project: Perennials as a Pathway to Sustainable Agricultural Landscapes in the Upper Midwestern U.S. Iowa State University. (wikipedia.org)