Influence of working pressure and spray nozzle on the distribution of spray liquid in manual backpack sprayers

Alcides Marangoni Junior,Marcelo Da Costa Ferreira

doi:10.1590/1808-1657000442018

Alcides Marangoni Junior, Marcelo Da Costa Ferreira

Open Access

https://doi.org/10.1590/1808-1657000442018

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Abstract

ABSTRACT Manual backpack sprayers are widely used in rural properties in Brazil. However, studies that assess their working characteristics, especially spray tip models and working pressure conditions, are scarce. Thus, the aim of this study was to assess how much the working pressure and spray tips influence the distribution quality of phytosanitary spray solutions in manual backpack sprayers. Four spray nozzles (standard flat-fan Magnojet TP11002, turbo flat-fan TeeJet TT11002, hollow-cone TeeJet TXA8002, and disc-core) were assessed in a patternator table at 1, 2, 3, and 4 bar. Analyses of spray distribution profile were performed by symmetry and the coefficient of variation (CV) analysed by the Tukey’s test (p < 0.05). Spray tip models and working pressure influenced in more than 100% the distribution uniformity values of spray solution and in about 50% the useful range of the phytosanitary treatment. Among the models assessed in this study, the turbo flat-fan spray nozzle presents the best set of characteristics to be indicated for manual backpack sprayers aiming at field phytosanitary treatments.

Highlights

MATERIAL AND METHODSBrazil has more than 7 million farms, and approximately one third are smaller than 10 acres in size (DIEESE, 2006; BRASIL, 2015)
The spray volume distribution profile of the nozzle tip models is characterized by an uneven spray distribution (Fig. 1), featuring an unimodal pattern for the flat spray (MAG) and turbo flat-fan spray (TT) models, and a bimodal pattern for the hollow cone (TXA) and “disc-core” models
The widest swath was found for the turbo flat-fan spray model (TT) model while the narrowest was found for the “disc-core” model

Summary

Introduction

MATERIAL AND METHODSBrazil has more than 7 million farms, and approximately one third are smaller than 10 acres in size (DIEESE, 2006; BRASIL, 2015). The aim of this research was to evaluate how spray nozzle tip models and operating pressure levels may affect the quality of distribution of phytosanitary spray solutions with manual backpack sprayers.

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