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Measurement of foliar spray retention on creeping bentgrass

Published online by Cambridge University Press:  19 August 2019

Pingyuan Zhang  and
Bruce E. Branham Open the ORCID record for Bruce E. Branham [Opens in a new window]
Pingyuan Zhang
Affiliation:
Former Graduate Student, Department of Crop Sciences, University of Illinois, Urbana, IL, USA
Bruce E. Branham*
Affiliation:
Professor, Department of Crop Sciences, University of Illinois, Urbana, IL, USA
*
Author for correspondence: Bruce E. Branham, Department of Crop Sciences, University of Illinois, 1201 S. Dorner Drive, Urbana, IL 61801. (E-mail: [email protected])
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Abstract

Experiments were conducted to evaluate the impact of spray volume, nozzle type, adjuvants, the presence of dew, and their interactions on foliar retention of creeping bentgrass. Tartrazine, a common food dye, was used as a tracer in this study. Increasing spray volume from 95 L ha−1 to 1,500 L ha−1 decreased foliar retention efficiency from 98% to approximately 85%. Compared with flat-fan nozzles, air-induction nozzles delivered similar retention efficiency at all spray volumes evaluated. However, flat-fan nozzles provided higher uniformity and more thorough coverage. Adding nonionic surfactants, organosilicone adjuvants, or methylated seed oils at typical concentrations yielded retention efficiency of approximately 90% to 93% regardless of spray volumes. In contrast, with water alone, increasing spray volume reduced retention efficiency from 95.9% to 87.3%. Simulated dew applied at 1,950 L ha−1 increased retention efficiency by approximately 3% when spray application volume was 190 L ha−1, while no difference was observed at 750 L ha−1. The presence of dew reduced the impact of adjuvants on retention efficiency. Large quantities of dew, 3,800 L ha−1, did reduce retention efficiency.

Keywords

Scott McElroy, Auburn UniversityCreeping bentgrassAgrostis stolonifera L. AGSST ‘L93’Adjuvantdewfoliar retention efficiencynozzle typespray volumetartrazine
Type
Research Article
Information
Weed Technology , Volume 33 , Issue 6 , December 2019 , pp. 827 - 832
Copyright
© Weed Science Society of America, 2019 

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