Nitrogen management will influence threshold values of green foxtail (Setaria viridis) in corn

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Fertilizer, manure and compost effects on weed growth and competition with winter wheat in western Canada (2005, background): “Research has shown that crop–weed competitive interactions can be altered by N dose (Cathcart and Swanton, 2003), source (Davis and Liebman, 2001), application timing (Angonin et al.”
Effect of Fertilizer Nitrogen on Weed Emergence and Growth (2008, background): “Soil samples were also collected from the 8 to 16 cm depth in 2004 to determine whether Nit at this soil depth increased following N application; a sign of potential N leaching (Cathcart and Swanton 2003).”
Nitrogen Fertilizer, Manure, and Compost Effects on Weed Growth and Competition with Spring Wheat (2005, methodology): “A field experiment was conducted to determine by N fertilizer dose (Cathcart and Swanton, 2003), applithe effect of various application timing–tillage intensities and N sources”
Effects of Nitrogen Fertilizer on Chlorophyll Content and Other Leaf Indicate in Three Cultivars of Maize (Zea mays L.) (2011, background): “activity and crop yield capacity [4] and its deficiency”