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Soybean canopy formation effects on pitted morningglory (Ipomoea lacunosa), common cocklebur (Xanthium strumarium), and sicklepod (Senna obtusifolia) emergence

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy
Jason K. Norsworthy*
Affiliation:
Department of Entomology, Soils, and Plant Sciences, Clemson University, 277 Poole Agricultural Center, Clemson, SC 29634; [email protected]
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Abstract

Field studies were conducted in 2002 and 2003 to determine whether canopy formation influences pitted morningglory, common cocklebur, and sicklepod emergence in surface-tilled soybean. Each weed species was broadcast seeded before planting soybean in 19- and 97-cm-wide rows. Weed emergence beneath soybean was monitored after soybean emergence and compared with weed emergence in the absence of soybean (bareground treatment). Magnitude of daily diurnal soil temperature fluctuations diminished after soybean canopy formation, and light interception by soybean was positively related to the reduction in soil temperature. Canopy formation (50% light interception) occurred 16 to 17 d later in wide compared with narrow rows in both years. The red/far-red ratio of light available to seed on or near the soil surface was reduced from as much as 1.2 in full sunlight to less than 0.1 in the presence of a dense soybean canopy. Pitted morningglory emergence was not influenced by soybean canopy formation, whereas common cocklebur and sicklepod emergence were reduced as much as 33 and 68%, respectively. Although common cocklebur and sicklepod emergence diminished after soybean canopy formation, a small portion of the seedbank of both species emerged beneath the canopy. This research indicates that in a tilled system, emergence of some weed species is diminished by presence of an overlying canopy, but emergence does not completely cease with canopy formation. Late-season emergence of sicklepod and common cocklebur beneath a soybean canopy may contribute to replenishment of the soil seedbank, especially if these late-emerging cohorts are capable of surviving until the light environment is favorable for seed production.

Keywords

Common cocklebur, Xanthium strumarium L. XANSTpitted morningglory, Ipomoea lacunosa L. IPOLAsicklepod, Senna obtusifolia (L.) Irwin and Barneby CASOBsoybean, Glycine max (L.) Merr. ‘Northrup King S73-Z5’, ‘Delta and Pineland 6880’Canopy formationweed emergencelight interceptionlight qualitysoil thermal amplitude
Type
Weed Biology and Ecology
Information
Weed Science , Volume 52 , Issue 6 , December 2004 , pp. 954 - 960
Copyright
Copyright © Weed Science Society of America 

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