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Planta Daninha

Print version ISSN 0100-8358

Abstract

FERREIRA, M.C et al. Volumetric distribution and droplet size of hydraulic spraying nozzles for the control of scarlet morningglory. Planta daninha [online]. 2011, vol.29, n.3, pp. 697-705. ISSN 0100-8358.  http://dx.doi.org/10.1590/S0100-83582011000300024.

Nozzles are responsible for the formation of drops, with each side presenting its own characteristics related to droplet deposition spectrum and profile specific to certain targets. This study aimed to characterize the diameter and uniformity of the droplets and volumetric distribution profile of nozzles AI 110015 and 110015 TTI, as well as their effect on the mortality of scarlet morningglory, using pre-emergent herbicide, alone or combined with adjuvants. The number of emerging plants and dry weight of shoot and root growth were evaluated. Volumetric distribution profiles for a 40cm height were evaluated in a table deposition. Based on the distribution profiles, a deposition pattern was simulated along the spray boom. Droplet diameter spectrum was determined in a particle size analyzer by laser light diffraction. The herbicide mixture diuron + hexazinone was effective in controlling pre-emergence scarlet morningglory, and organo-modified polymethyl siloxane or mineral oil may be used as adjuvants, in association with nozzles AI 110015 or 110015 TTI. The use of adjuvants allowed the increase in volume median diameter and reduction in the percentage of droplets with diameter below 100 micrometers. The suggested spacing between nozzles on the spray bar was 70 cm for AI 110015 and 80 cm for the TTI 110015.

Keywords : deposition pattern; application technology; Ipomoea hederifolia .

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