Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass

Martin M. Williams, David A. Mortensen, Alex R. Martin, David B Marx

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Soil organic carbon (OC), clay content, water content, and pH often influence the bioactivity of soil-applied herbicides, and these soil properties can vary greatly within fields. The purpose of this work was to determine the influence of within-field soil heterogeneity on the efficacy of RPA-201772 where corn, shattercane, and velvetleaf were seeded as bioassays. An experimental approach was developed to quantify RPA-201772 dose-response across a range of soil conditions in an agricultural field. Based on a logistic model, crop injury was quantified with the I20 parameter, the dose eliciting 20% greenness reduction, using a series of photographic standards. Weed biomass was quantified with the I80 parameter, the dose eliciting 80% biomass reduction, relative to the untreated control. Crop and weed responses varied by two orders of magnitude. Significant correlation, as high as 0.76, was observed between measures of plant response and soil properties, namely particle size and OC. Furthermore, native velvetleaf spatial distribution at the study site was heterogeneous, and seedlings were observed in plots where seeded velvetleaf biomass was high. Spatial heterogeneity of soil affinity for herbicide results in differential weed fitness and contributes to weed "patchiness.".

Original languageEnglish (US)
Pages (from-to)798-805
Number of pages8
JournalWeed Science
Volume49
Issue number6
StatePublished - Dec 1 2001

Fingerprint

soil heterogeneity
Abutilon theophrasti
herbicides
weeds
biomass
crops
soil properties
Sorghum bicolor subsp. drummondii
logit analysis
dosage
soil organic carbon
dose response
plant response
particle size
soil quality
bioassays
clay
spatial distribution
water content
corn

Keywords

  • Dose-response
  • Site-specific
  • Spatial

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

Cite this

Williams, M. M., Mortensen, D. A., Martin, A. R., & Marx, D. B. (2001). Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass. Weed Science, 49(6), 798-805.

Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass. / Williams, Martin M.; Mortensen, David A.; Martin, Alex R.; Marx, David B.

In: Weed Science, Vol. 49, No. 6, 01.12.2001, p. 798-805.

Research output: Contribution to journalArticle

Williams, MM, Mortensen, DA, Martin, AR & Marx, DB 2001, 'Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass', Weed Science, vol. 49, no. 6, pp. 798-805.
Williams MM, Mortensen DA, Martin AR, Marx DB. Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass. Weed Science. 2001 Dec 1;49(6):798-805.
Williams, Martin M. ; Mortensen, David A. ; Martin, Alex R. ; Marx, David B. / Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass. In: Weed Science. 2001 ; Vol. 49, No. 6. pp. 798-805.
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