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Spatial and temporal stability of weed populations over five years

Published online by Cambridge University Press:  20 January 2017

Nathalie Colbach ,
Frank Forcella  and
Gregg A. Johnson
Frank Forcella
Affiliation:
North Central Soil Conservation Research Laboratory, USDA-ARS, Morris, MN 56267
Gregg A. Johnson
Affiliation:
Department of Agronomy and Plant Genetics, Southern Research and Outreach Center, University of Minnesota, Waseca MN 56093
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Abstract

The size, location, and variation in time of weed patches within an arable field were analyzed with the ultimate goal of simplifying weed mapping. Annual and perennial weeds were sampled yearly from 1993 to 1997 at 410 permanent grid points in a 1.3-ha no-till field sown to row crops each year. Geostatistical techniques were used to examine the data as follows: (1) spatial structure within years; (2) relationships of spatial structure to literature-derived population parameters, such as seed production and seed longevity; and (3) stability of weed patches across years. Within years, densities were more variable across crop rows and patches were elongated along rows. Aggregation of seedlings into patches was strongest for annuals and, more generally, for species whose seeds were dispersed by combine harvesting. Patches were most persistent for perennials and, more generally, for species whose seeds dispersed prior to expected dates of combine harvesting. For the most abundant weed in the field, the annual, Setaria viridis, locations of patches in the current year could be used to predict patch locations in the following year, but not thereafter.

Keywords

Amaranthus retroflexus L. AMARE, redroot pigweedAsclepias syriaca L. ASCSY, common milkweedBrassica kaber (DC.) L.C. Wheeler SINAR, wild mustardChenopodium album L. CHEAL, common lambsquartersCirsium arvense (L.) Scop CIRAR, Canada thistleElytrigia repens (L.) Nevski AGRRE, quackgrassSetaria viridis (L.) Beauv. SETVI, green foxtailGlycine max (L.) Merr., soybeanCross-semivariogramgeostatisticskrigingpatchprecision farmingsemivariogram
Type
Research Article
Information
Weed Science , Volume 48 , Issue 3 , June 2000 , pp. 366 - 377
Copyright
Copyright © Weed Science Society of America 

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