Competition of smooth {Amaranthus hybridus) and livid (A. lividus) amaranth with cucumber (Cucumis sativus)

Adrian Berry, W. M. Stall, B. Rathinasabapathi, G. E. MacDonald, R. Charudattan

Abstract


Additive studies were conducted in Gainesville and Live Oak to determine the effect of season-long interference of smooth (Amaranthus hybridus) and livid (A. lividus) amaranth on cucumber (Cucumis sativus) yield. A single row of cucumber was hand-seeded to give four plants per m2 down the center of each bed. Smooth and livid amaranth were transplanted randomly on the beds at cucumber emergence and allowed to compete throughout the growing season. Marketable cucumber fruit were harvested 5-6 times with fruit number and weight recorded. Amaranth densities as low as 1-2 weeds per m2 can cause a 10% reduction in cucumber yield. However, in the fall season at Gainesville it took 8 weeds per m2 to reduce yield by 10%. The biological threshold of livid and smooth amaranth with cucumber appears to be at 6-8 weeds per m2. Dry weights of smooth and livid amaranth were obtained from plots grown with cucumber (interspecific) and plots without cucumber (intraspecific). Livid and smooth amaranth dry weight decreased as density increased. Comparisons of mean dry weights of livid and smooth amaranth in the intraspecific study and inter specific study indicate that cucumber was very competitive with, and significantly reduced the dry weight of, both species of amaranths.

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283