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Nozzle and Carrier Application Effects on Control of Soybean Leaf Spot Diseases

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  071150.(doi:10.13031/2013.22919)
Authors:   H Mark Hanna, Alison E Robertson, W Mark Carlton, Robert E Wolf
Keywords:   air-assist, application, disease, fungicide, nozzle tip, soybean, canopy penetration

A two-site, two-year field application experiment investigated fungicide coverage in a fully-developed soybean canopy. Application treatments included “high-rate” (187 l/ha; 20 gal/acre) and “low-rate” (112 l/ha;12 gal/acre) with fine-droplet two-orifice tips, medium-droplet two-orifice tip at 187 l/ha (20 gal/acre), a coarse-droplet single-orifice “herbicide-style” tip at 168 l/ha (18 gal/ac), and an air-assisted spray treatment. Droplet coverage and size, and foliar disease severity in the lower, middle, and top parts of the plant canopy, and crop yield were measured.

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