“…Plants of the Amaranthus genus have Kranz leaf anatomy (Ferreira et al, 2003), typical of species with C4 photosynthetic cycle, providing efficiency in the production of carbohydrates in wormer and drier environments, especially when compared to C3 crops, such as soybean and cotton (Carvalho, 2015). These features render Amaranthus a high competitive ability with crops for light, water, and nutrients (Guo & Al-Khatib, 2003;Silva et al, 2010;Barroso et al, 2012). The negative interference intensity of Amaranth on crop growth, development, and yield is dependent on the crop species, density and time of emergence (Klingaman & Oliver, 1994;Knezevic et al, 1997).…”