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Effects of Tillage and Light Environment on Emergence of 13 Annual Weeds

Published online by Cambridge University Press:  12 June 2017

Douglas D. Buhler
Douglas D. Buhler*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, 2150 Pammel Drive, Ames, IA 50011; [email protected]
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Abstract

Seeds of many plant species require a brief exposure to light to induce germination. Modifying the light environment during soil tillage may alter weed emergence in agricultural systems. The objective of this research was to evaluate the effect of secondary tillage conducted during daylight and at night on the emergence of 13 summer annual weed species under the same soil and environmental conditions. Annual grass and large-seeded broadleaf species showed little response to light environment during tillage. However, emergence was often less when no tillage was conducted than with any tillage by light environment combination. Emergence of small-seeded broadleaf species often was lower when tillage was conducted during darkness than with tillage during the light. Reductions varied by experiment and species and ranged from 70% for common lambsquarters to less than 30% for Pennsylvania smartweed. Large variations in response also occurred within species.

Keywords

Common lambsquarters, Chenopodium album L. # CHEALPennsylvania smartweed, Polygonum pensylvanicum L. # POLPY.Dark tillagephotodormancyweed ecologyweed population dynamicsCHEALPOLPY
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 496 - 501
Copyright
Copyright © 1997 by the Weed Science Society of America 

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