HOW DO THE DROPLET SPECTRUM UNIFORMITY AND SPRAY VOLUME OF FLAT-FAN NOZZLES INFLUENCE FUNGICIDE SPRAY DISTRIBUTION QUALITY IN SOYBEANS?

Griesang, Fabiano; Ferreira, Marcelo da C.; Spadoni, Ana B. D.; Della Vechia, Jaqueline F.; Santos, Renata T. da S.; dos Santos, Cícero A. M.

doi:10.1590/1809-4430-Eng.Agric.v42n2e20210122/2022

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Scientific Paper • Eng. agríc. (Online) 42 (2) • 2022 • https://doi.org/10.1590/1809-4430-Eng.Agric.v42n2e20210122/2022 copy

HOW DO THE DROPLET SPECTRUM UNIFORMITY AND SPRAY VOLUME OF FLAT-FAN NOZZLES INFLUENCE FUNGICIDE SPRAY DISTRIBUTION QUALITY IN SOYBEANS?

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Droplet spectrum quality is essential to effectively control crop pests and diseases. This study aimed to characterize the droplet uniformity of the eight most popular flat-fan nozzles used by Brazilian farmers and relate it to their spraying quality. The method consisted of using a laser-diffraction-size analyser to determine droplet-size distribution for three fungicide spray solution compositions and at two flow rates. Our goal was to identify the nozzle models with the highest and lowest Span values for each fungicide spray solution. In the first stage, the results confirmed differences in uniformity and droplet size for both nozzle models and flow rates applied. However, these differences were not the same for both flow rates nor constant for all fungicide spray solution compositions. Through field experiments, we could understand how the combination of flow rate, nozzle model, and spray solution composition provides different results and application efficiencies. Based on our results, we can state that Span has an impact on the number of droplets prone to drift and quality of canopy coverage. Therefore, this droplet-quality parameter should be considered and displayed in nozzle catalogues to improve nozzle selection and sprayer configuration, thus enhancing application quality.

KEYWORDS
application technology; coverage; deposits; drift; Span

	VMD				Span				V100
	110 015	110 03			110 015	110 03			110 015	110 03
N unif	140.42	^aB	181.08	^nsA	1.32	^aB	1.57	^aA	29.75	^aA	19.65	^aB
Unif	134.38	^bB	180.25	^A	1.17	^bB	1.39	^bA	27.76	^bA	17.53	^bB
dms	2.682				0.023				1.161

	VMD						Span						V100
	Elatus	Li-700		Nimbus			Elatus	Li-700		Nimbus			Elatus	Li-700		Nimbus
N unif	142.6	^nsC	173.75	^aA	165.8	^nsB	1.47	^aA	1.45	^aA	1.41	^aB	30.25	^aA	21.10	^nsB	22.75	^nsB
Unif	141.6	^B	166.63	^bA	163.6	^A	1.25	^bB	1.29	^bA	1.30	^bA	26.49	^bA	19.79	^C	21.65	^B
lsd	column	3.28		LINE		3.96	colum	0.028		LINE		0.03	column	1.41		LINE		1.71

		Deposit (μl cm^-2)						Coverage (%)
		Lower		Middle		Upper		Lower		Middle		Upper
Volume	75 L/ha	0.39	^a	0.52	^ns	1.02	^b	0.43	^b	2.20	^b	14.40	^b
Volume	150 L/ha	0.33	^b	0.54	^ns	1.20	^a	0.74	^a	4.34	^a	26.18	^a
	dms (column)	0.05		0.11		0.13		0.125		0.7		1.57
Spray solution composition	Elatus	0.35	^ns	0.56	^ns	1.09	^ns	0.61	^ab	3.18	^ns	17.75	^b
	Li-700	0.38		0.49		1.20		0.68	^a	3.52		22.24	^a
	Nimbus	0.36		0.53		1.04		0.46	^b	3.11		20.89	^a
	dms (column)	0.07		0.17		0.19		0.18		1.04		2.32
Droplet Uniformity	N unif	0.33	^b	0.53	^ns	1.13	^ns	0.56	^ns	3.11	^ns	20.38	^ns
Droplet Uniformity	Unif	0.40	^a	0.52	^ns	1.09	^ns	0.60	^ns	3.43	^ns	20.20	^ns
	dms (column)	0.05		0.11		0.13		0.12		0.70		1.57
	CV (%)	23.8		23.5		19.3		36.7		36.7		13.2

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

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[1] * Corresponding author. Sao Paulo State University - UNESP/FCAV - São Paulo, Brasil. E-mail: fgriesang@hotmail.com