Field studies were conducted in 2016 and 2017 in Clinton, NC, to determine the interspecific and intraspecific interference of Palmer amaranth (Amaranthus palmeri S. Watson) or large crabgrass [Digitaria sanguinalis (L.) Scop.] in ‘Covington’ sweetpotato [Ipomoea batatas (L.) Lam.]. Amaranthus palmeri and D. sanguinalis were established 1 d after sweetpotato transplanting and maintained season-long at 0, 1, 2, 4, 8 and 0, 1, 2, 4, 16 plants m−1 of row in the presence and absence of sweetpotato, respectively. Predicted yield loss for sweetpotato was 35% to 76% for D. sanguinalis at 1 to 16 plants m−1 of row and 50% to 79% for A. palmeri at 1 to 8 plants m−1 of row. Weed dry biomass per meter of row increased linearly with increasing weed density. Individual dry biomass of A. palmeri and D. sanguinalis was not affected by weed density when grown in the presence of sweetpotato. When grown without sweetpotato, individual weed dry biomass decreased 71% and 62% from 1 to 4 plants m−1 row for A. palmeri and D. sanguinalis, respectively. Individual weed dry biomass was not affected above 4 plants m−1 row to the highest densities of 8 and 16 plants m−1 row for A. palmeri and D. sanguinalis, respectively.
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30 July 2019
Interspecific and Intraspecific Interference of Palmer Amaranth (Amaranthus palmeri) and Large Crabgrass (Digitaria sanguinalis) in Sweetpotato
Nicholas T. Basinger,
Katherine M. Jennings,
David W. Monks,
David L. Jordan,
Wesley J. Everman,
Erin L. Hestir,
Matthew D. Waldschmidt,
Stephen C. Smith,
Cavell Brownie
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Weed Science
Vol. 67 • No. 4
July 2019
Vol. 67 • No. 4
July 2019
biomass
competition
linear-plateau model
rectangular hyperbola model
weed density
yield loss
