Evaluating the use of digital terrain modelling for quantifying the spatial variability of 2,4-D sorption by soil within agricultural landscapes

Farenhorst, Annemieke; Florinsky, Igor V.; Monreal, Carlos M.; Muc, Dennis

doi:10.4141/s01-037

Cited by 18 publications

(12 citation statements)

References 45 publications

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“…This is in agreement with the findings of previous studies in which soil organic carbon content was the primary factor influencing 2,4-D sorption in surface soil, both in field and laboratory experiments (Hermosin and Cornejo 1991;Mallawatantri and Mulla 1992;Johnson et al 1995;Farenhorst et al 2003). The A horizon had significantly greater capacity to sorb the herbicide relative to the B *, **, and *** denote P < 0.05, P < 0.01, and P < 0.001 level of significance, respectively, for correlations Ho: r = 0; Ha: r ≠ 0.…”

Section: Discussionsupporting

confidence: 93%

“…Herbicide persistence and mobility may vary in field soils as sorption processes respond to the heterogeneity of soil properties that exists across slope positions and with soil depth (Jacobsen et al 2001;Strebe and Talbert 2001;Farenhorst et al 2003). Factors that affect the variation of soil properties across slope positions and with soil depth include soil pedogenic factors, such as the influence of topography on hydrologic processes, and irregularities in parent material deposition (Goderya 1998).…”

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confidence: 99%

“…There are also limited studies on the spatial variability of herbicide sorption within landscapes (Farenhorst et al 2003). Additional information on the spatial distribution of herbicide fate across slope positions and with depth could enable producers and policy makers to make more informed weed management decisions and reduce environmental contamination by herbicides (Khakural et al 1994).…”

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confidence: 99%

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Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Gaultier¹,

Farenhorst²,

Crow³

2006

Can. J. Soil. Sci.

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Gaultier, J., Farenhorst, A. and Crow, G. 2006. Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth. Can. J. Soil Sci. 86: 89-95. Since pesticide fate and leaching models increasingly incorporate spatial variability, the objective of this study was to quantify the variability of soil properties and 2,4-D sorption within a hummocky field as affected by landscape position and soil depth. Seventy-two soil cores collected at 5-m intervals along a transect were segmented by soil horizon (A, B and C) and landscape position (upper, mid, lower and depression). As expected, soil organic carbon content significantly decreased, and soil pH and soil carbonate content significantly increased with soil depth, while clay content was significantly greater in the B horizon than the A and C horizon. Soils from the depressional area generally had higher soil organic carbon content, soil carbonate content, clay content and soil pH than soil samples from other slope positions. The sorption of 2,4-D by soil was positively correlated with soil organic matter content and negatively correlated with soil carbonate content. These soil properties and herbicide sorption varied along the transect and with soil depth. Regardless of whether or not the landscape was segmented by landscape position, for both the A and C horizon, predictions of 2,4-D sorption by soil were generally good using simple regression models that contained soil organic carbon content and carbonate content as the only parameters. However, for the B horizon, the prediction of 2,4-D sorption by soil was very poor when all sampling points along the transect were considered, but greatly improved for the mid-and depressional slope positions when soils were segmented by landscape position. We conclude that segmentation by slope position could be a useful additional tool when predicting pesticide fate and leaching at the large-scale. As well, the negative association between soil carbonate content and 2,4-D sorption warrants further attention as a large portion of Canadian agriculture encompasses calcareous soils. . Comme il fallait s'y attendre, la teneur en carbone organique diminue significativement alors que le pH et la concentration de carbonates augmentent significativement avec la profondeur; parallèlement, il y a sensiblement plus d'argile dans l'horizon B que dans les horizons A et C. Le sol des dépressions contient généralement plus de carbone organique, de carbonates et d'argile que le sol prélevé ailleurs sur la pente et son pH est plus élevé. La sorption du 2,4-D par le sol présente une corrélation positive avec la concentration de matière organique et une autre, négative, avec la concentration de carbonates. Ces propriétés du sol et la sorption de l'herbicide varient avec l'emplacement le long du transect et la profondeur. Les modèles à régression simple n'ayant pour seuls paramètres que la concentration de carbone organique et de carbonates prévoient généralement bien la sorption du 2,4-D p...

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Section: Discussionsupporting

confidence: 93%

mentioning

confidence: 99%

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confidence: 99%

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Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Gaultier¹,

Farenhorst²,

Crow³

2006

Can. J. Soil. Sci.

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“…There was a positive linear relation between SOC and 2,4-D Kd, as observed for other surface and subsurface soils in agricultural fields (Farenhorst et al, 2003;Gaultier et al, 2006;Farenhorst et al, 2008). This is not surprising because soil organic carbon content is the primary factor influencing 2,4-D sorption (Reddy and Gambrell, 1987;Mallawatantri and Mulla, 1992;Hermosin and Cornejo, 1993;Johnson et al, 1995).…”

Section: Discussionsupporting

confidence: 49%

Variations in soil properties and herbicide sorption coefficients with depth in relation to PRZM (pesticide root zone model) calculations

et al. 2009

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“…Sorption coefficients (measures of pesticide sorption by soil) are among the most sensitive input parameters in pesticide fate models. It has been demonstrated that sorption coefficients (K d ) vary within soil landscapes due to differences in soil organic carbon (SOC) content or soil pH between slope positions (Novak et al, 1997; Farenhorst et al, 2003). Establishing methods to account for this variation could reduce uncertainties in regional‐scale assessments of pesticide fate (Dubus et al, 2003).…”

Section: Description Of Terrain Attributesmentioning

confidence: 99%

Herbicide Sorption Coefficients in Relation to Soil Properties and Terrain Attributes on a Cultivated Prairie

et al. 2008

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The sorption of 2,4-D and glyphosate herbicides in soil was quantified for 287 surface soils (0-15 cm) collected in a 10 x 10 m grid across a heavily eroded, undulating, calcareous prairie landscape. Other variables that were determined included soil carbonate content, soil pH, soil organic carbon content (SOC), soil texture, soil loss or gain by tillage and water erosion, and selected terrain attributes and landform segments. The 2,4-D sorption coefficient (Kd) was significantly associated with soil carbonate content (-0.66; P < 0.001), soil pH (-0.63; P < 0.001), and SOC (0.47; P < 0.001). Upper slopes were strongly eroded and thus had a significantly greater soil carbonate content and less SOC compared with lower slopes that were in soil accumulation zones. The 2,4-D Kd was almost twice as small in upper slopes than in lower slopes. The 2,4-D Kd was also significantly associated with nine terrain attributes, particularly with compounded topographic index (0.59; P < 0.001), gradient (-0.48; P < 0.001), mean curvature (-0.43; P < 0.001), and plan curvature (-0.42 P < 0.001). Regression equations were generated to estimate herbicide sorption in soils. The predicted power of these equations increased for 2,4-D when selected terrain attributes were combined with soil properties. In contrast, the variation of glyphosate sorption across the field was much less dependent on our measured soil properties and calculated terrain attributes. We conclude that the integration of terrain attributes or landform segments in pesticide fate modeling is more advantageous for herbicides such as 2,4-D, whose sorption to soil is weak and influenced by subtle changes in soil properties, than for herbicides such as glyphosate that are strongly bound to soil regardless of soil properties.

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Evaluating the use of digital terrain modelling for quantifying the spatial variability of 2,4-D sorption by soil within agricultural landscapes

Cited by 18 publications

References 45 publications

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Variations in soil properties and herbicide sorption coefficients with depth in relation to PRZM (pesticide root zone model) calculations

Herbicide Sorption Coefficients in Relation to Soil Properties and Terrain Attributes on a Cultivated Prairie

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