Herbicide coverage in narrow row soybean as influenced by spray nozzle design and carrier volume

Legleiter, Travis R.; Johnson, William

doi:10.1016/j.cropro.2016.01.009

Cited by 28 publications

(22 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although this research was conducted in a fallow environment, similar results could be expected within a cropping-system scenario, as previous research demonstrated similar spray coverage at the bottom of a soybean canopy across a range of droplet sizes (Legleiter and Johnson 2016). Therefore, the droplet size effect on dicamba-plus-glyphosate mixture efficacy observed in this research must be due to variables other than spray coverage, such as droplet impaction efficiency, retention, absorption, and translocation.…”

Section: Response Variablesupporting

confidence: 77%

Droplet Size Impact on Efficacy of a Dicamba-plus-Glyphosate Mixture

et al. 2019

View full text Add to dashboard Cite

Chemical weed control remains a widely used component of integrated weed management strategies because of its cost-effectiveness and rapid removal of crop pests. Additionally, dicamba-plus-glyphosate mixtures are a commonly recommended herbicide combination to combat herbicide resistance, specifically in recently commercially released dicamba-tolerant soybean and cotton. However, increased spray drift concerns and antagonistic interactions require that the application process be optimized to maximize biological efficacy while minimizing environmental contamination potential. Field research was conducted in 2016, 2017, and 2018 across three locations (Mississippi, Nebraska, and North Dakota) for a total of six site-years. The objectives were to characterize the efficacy of a range of droplet sizes [150 µm (Fine) to 900 µm (Ultra Coarse)] using a dicamba-plus-glyphosate mixture and to create novel weed management recommendations utilizing pulse-width modulation (PWM) sprayer technology. Results across pooled site-years indicated that a droplet size of 395 µm (Coarse) maximized weed mortality from a dicamba-plus-glyphosate mixture at 94 L ha–1. However, droplet size could be increased to 620 µm (Extremely Coarse) to maintain 90% of the maximum weed mortality while further mitigating particle drift potential. Although generalized droplet size recommendations could be created across site-years, optimum droplet sizes within each site-year varied considerably and may be dependent on weed species, geographic location, weather conditions, and herbicide resistance(s) present in the field. The precise, site-specific application of a dicamba-plus-glyphosate mixture using the results of this research will allow applicators to more effectively utilize PWM sprayers, reduce particle drift potential, maintain biological efficacy, and reduce the selection pressure for the evolution of herbicide-resistant weeds.

show abstract

Section: Response Variablesupporting

confidence: 77%

Droplet Size Impact on Efficacy of a Dicamba-plus-Glyphosate Mixture

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In previous work, no interaction was found between nozzle type (Drift Guard and conventional nozzles) and application volume (47, 90, and 190 L ha −1 ) on herbicide efficacy of either glyphosate or paraquat on grass control (Ramsdale and Messersmith 2001). Similarly, there was no interaction between application volume (94 and 140 L ha −1 ) and nozzle type (extended range, air induction extended range, Turbo TeeJet, and Turbo TeeJet air induction) on herbicide efficiency between the bottom and middle of a soybean canopy (Legleiter and Johnson 2016). This supports our work, suggesting that nozzle type and application volume effects are independent of each other.…”

Section: Resultsmentioning

confidence: 97%

Spray Penetration into a Strawberry Canopy as Affected by Canopy Structure, Nozzle Type, and Application Volume

et al. 2017

View full text Add to dashboard Cite

Strawberries, an important Florida crop, are grown on raised beds covered with plastic mulch. The plastic mulch provides good control of many weeds, but some problem species can emerge from the transplant hole during crop establishment. POST herbicide options for broadleaf weed control within the strawberry bed is limited to clopyralid, which only provides suppression. Strawberry canopy shielding may be responsible for the observed incomplete control with clopyralid application for problematic broadleaf weed species such as black medic and Carolina geranium. Two field experiments were established on mature strawberries to evaluate spray penetration through the canopy. The first examined spray penetration through the canopy of multiple strawberry cultivars at various distances from the crown. The second examined the effects of application volumes and nozzle selection on spray penetration. Cultivar selection had no effect on spray penetration through the canopy. In the first study, when applying at 281 L ha−1, the area around the planting hole (0 to 5 cm from the crown) had 8% coverage below the canopy while the area below the canopy edge (10 to 15 cm from the crown) had 27% coverage. In the second study, increasing the application volume from 187 to 375 L ha−1increased coverage by 81%. Increasing the application volume from 375 to 740 L ha−1increased coverage 33% with maximal coverage of 53% at 740 L ha−1. Nozzle type (standard even flat spray tip, Drift Guard, or TwinJet nozzles) did not affect coverage or deposition volume below the canopy. Overall, mature strawberry canopies demonstrated similar spray droplet penetration across cultivars with increased penetration with increased distance from the crown. Penetration increased with increasing application volume, but the nozzle types used in this experiment did not affect penetration. Additional research is needed to better define the effect of application volume on herbicide efficacy.

show abstract

“…29 In addition to droplet size, carrier volume plays a crucial role in herbicide coverage and efficacy. 30 Generally, across herbicides, efficacy decreased as carrier volume decreased. 24 This result is expected because reduced volume should result in decreased coverage of the target weed species.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to droplet size, carrier volume plays a crucial role in herbicide coverage and efficacy . Generally, across herbicides, efficacy decreased as carrier volume decreased .…”

Section: Introductionmentioning

confidence: 99%