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Poster Presentations


Poster Presentations


Deposition efficiency of pesticide application

Presenter: Roberto N Barbosa(1)

Other authors and affiliations: James L. Griffin(3), Clayton A. Hollier(2). (1)Louisiana State University Agricultural Center, Biological and Agricultural Engineering, Baton Rouge, LA 70803, U.S.A.; (2)Louisiana State University Agricultural Center, Plant Pathology and Crop Physiology, Baton Rouge, LA 70803, U.S.A.; (3)Louisiana State University Agricultural Center, School of Plant, Environmental and Soil Sciences, Baton Rouge, LA 70803, U.S.A.

To investigate the role that application method and application volume play in the efficiency of deposition and distribution of chemical products in the soybean canopy, tests were conducted in Louisiana during the 2007 season. Aerial and ground applications methods and different volumes of application (28, 46.7, 65.4, and 93.4 lha1 for aerial application; 46.7, 93.4, and 140 lha1 for ground application) were used. Artificial mylar cards, measuring 0.076 0.05 m were distributed throughout the soybean canopy (top, middle, and bottom portion) to capture spray deposits. Acid Yellow Five, also known as tartrazine, was selected as the tracer of choice. Tracer application rates were 1,500 gha1 for ground application and 750 gha1 for aerial application. Results show that, in both methods of application (aerial and ground), increasing volume of application increases product deposition in the canopy. Deposition is hereby defined as the sum of deposition in bottom, middle, and top parts of the plant. Although more product is deposited with increasing application rates, product penetration through the canopy remains somewhat constant. Ground application when compared with aerial application at the volumes of 46.7 and 93.4 lha1 yielded better deposits and better product penetration. Single-orifice nozzles used in ground applications seem to do a better job in increasing deposition that double (twin)-orifice nozzles. Twin nozzles do seem to have the edge in product distribution throughout the canopy.

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