Autor(es):
Alves, Guilherme Sousa ; Vieira, Bruno C. ; Carvalho, Fernando K. ; Cunha, Joao Paulo A. R. da ; Antuniassi, Ulisses R. [UNESP] ; Kruger, Greg R. ; Linscott, D. J.
Data: 2020
Identificador Persistente: http://hdl.handle.net/11449/196608
Origem: Oasisbr
Assunto(s): herbicide; spray droplet size; potential risk of drift; high-speed wind tunnel; herbicide; herbicide; spray droplet size; spray droplet size; potential risk of drift; potential risk of drift; high-speed wind tunnel; high-speed wind tunnel
Descrição
Made available in DSpace on 2020-12-10T19:50:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01
Spray classification based on droplet size has been used worldwide to characterize nozzles in relation to efficacy and drift potential. The objectives of this study were to evaluate the effect of pressure, flat angle of nozzle, and deflection angle on droplet spectrum in aerial applications of glyphosate using a high-speed wind tunnel. Two independent studies were conducted: one evaluating pressure (207, 310, 414 kPa) and deflection angle (0 degrees, 30 degrees, 60 degrees, 90 degrees) with CP-11TT 8008 nozzles, and another study evaluating flat-fan angle (20 degrees, 40 degrees, 80 degrees) of CP-11TT nozzles with 08 orifice size and the same deflection angles used in a previous study, at 207 kPa pressure. The solution was prepared with water and Roundup PowerMax at 2.34 L ha(-1) as a source of glyphosate, simulating a carrier volume of 30 L ha(-1). Droplet size data were recorded in a high-speed wind tunnel using a Sympatec HELOS laser diffraction system. The droplet size was affected by interactions between pressure versus deflection angle and flat-fan versus deflection angle. Selecting narrower angles of flat-fan nozzles and deflections, as well as higher pressures, are viable alternatives to mitigate glyphosate drift from aerial applications.
Univ Nebraska Lincoln, Agron & Hort, 402 West State Farm Rd, North Platte, NE 69101 USA
Agroefetiva, 689 Pinheiro Machado St, BR-18603760 Botucatu, SP, Brazil
Univ Fed Uberlandia, Inst Agr Sci, Campus Gloria Block CCG, BR-38410337 Uberlandia, MG, Brazil
Sao Paulo State Univ, Dept Rural Engn, 3780 Univ Ave, BR-18610034 Botucatu, SP, Brazil
Sao Paulo State Univ, Dept Rural Engn, 3780 Univ Ave, BR-18610034 Botucatu, SP, Brazil
