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Velvetleaf (Abutilon theophrasti) Recruitment, Survival, Seed Production, and Interference in Soybean (Glycine max)

  • John L. Lindquist (a1), Bruce D. Maxwell (a2), Douglas D. Buhler (a3) and Jeffrey L. Gunsolus (a4)

Abstract

Field studies were conducted at Rosemount, MN, in 1992 and 1993 to quantify the demographic processes regulating the population dynamics of velvetleaf in soybean as part of a corn-soybean rotation. A consistent 6.8 ± 0.5% of the total velvetleaf seedbank emerged each year. Less than 21% of all velvetleaf seedlings survived each year in mixture with soybean, due in part to Verticillium spp wilt infection. The probability of seedling survival varied across time of emergence. Velvetleaf seed production in the absence of crop competition was 125 and 227 seeds plant−1 in 1992 and 1993, respectively. Velvetleaf plants that emerged early produced greater numbers of seed than later emerging plants. Velvetleaf survival and seed production were reduced up to 82% in the presence of crop competition. Soybean yield varied across soybean densities in both years, but was not reduced across velvetleaf densities.

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Keywords

Velvetleaf (Abutilon theophrasti) Recruitment, Survival, Seed Production, and Interference in Soybean (Glycine max)

  • John L. Lindquist (a1), Bruce D. Maxwell (a2), Douglas D. Buhler (a3) and Jeffrey L. Gunsolus (a4)

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