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Photosynthesis and Transpiration Response of Redroot Pigweed (Amaranthus retroflexus)

Published online by Cambridge University Press:  12 June 2017

David C. Nielsen  and
Randy L. Anderson
David C. Nielsen
Affiliation:
U.S. Dep. Agric., Akron, CO 80720
Randy L. Anderson
Affiliation:
U.S. Dep. Agric., Akron, CO 80720
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Abstract

Redroot pigweed is a major weed worldwide. Increasing emphasis on modeling physiological processes of weeds for use in weed control decision support systems requires a knowledge of the response of weeds to resource levels and environmental conditions. The purpose of this study was to determine functional relationships for carbon exchange rate (CER) and transpiration based on photosynthetic photon flux density (PPFD) and temperature from measurements made on field-grown redroot pigweed. Measurements were made using a portable photosynthesis system on four dates. An equation that had the form of a power function on PPFD and a quadratic polynomial on temperature was fit to the data. The equation fit the measured CER data better than the measured transpiration data. The equations should be useful in modeling the physiological processes of pigweed within crop canopies.

Keywords

Redroot pigweed, Amaranthus retroflexus L. # AMARETranspirationstomatal conductancetemperaturecarbon exchange ratemodels
Type
Research
Information
Weed Technology , Volume 8 , Issue 2 , June 1994 , pp. 265 - 269
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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