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Effects of Temperature and Competition on the Establishment and Growth ofRedroot Pigweed and Common Lambsquarters¹

A comparison was made of the germination, growth, and leaf CO₂-exchange rates of redroot pigweed (Amranthus retroflexus L.) and common lambsquarters (Chenopodium album L.) under varied temperature regimes. It was found that redroot pigweed had greater rates of germination, growth, and CO₂-exchange rates at high temperatures, whereas common lambsquarters performed better at low temperatures. The implications of such characteristics for competition between these species of weeds and their effect on crops are discussed.

Key Words: Amaranthus retroflexus L. • Chenopodium album L. • Leaf CO₂-exchange • Germination rate index • Growth

² Graduate research assistant, assistant professor, and professor and chairman of Dep. of Vegetable Crops, Cornell Univ. respectively, Ithaca, NY 14853. Present address of senior author, Agway Research Center, R.D. 2, Tully, NY 13159.

³ Professor and head, Dep. of Horticultural Science and Landscape Architecture, Univ. of Minnesota, St. Paul, MN 55101.

Received for publication June 20, 1977.