Effect of sub-doses of 2,4-D choline salt on the characteristics of cotton fiber

Marques, Ricardo Fagundes; Pinheiro, Guilherme Henrique Rodrigues; Araújo, Prissila Pereira dos Santos; Souza, Rodrigo Marques de; Marchi, Sidnei Roberto de

doi:10.5935/1806-6690.20210022

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Scientific Article • Rev. Ciênc. Agron. 52 (2) • 2021 • https://doi.org/10.5935/1806-6690.20210022 copy

Effect of sub-doses of 2,4-D choline salt on the characteristics of cotton fiber¹ 1 Parte da Dissertação do primeiro autor, apresentada ao Curso de Pós-Graduação em Agronomia (Produção Vegetal), Universidade Federal de Goiás/UFG - Regional Jataí

Efeito de subdoses de 2,4-D sal colina nas características da fibra do algodoeiro

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Cotton is considered to be one of the most sensitive crops to the herbicide 2,4-D, however, there are no studies related to the effects of contamination of this herbicide on the fiber quality characteristics of cotton. Thus, the objective of this study was to evaluate the effect of sub-doses of 2,4-D choline salt formulation on the quality characteristics of cotton fiber at different phenological stages. The experimental design was based on randomized blocks, with four repetitions and treatments distributed in a 7 x 3 factorial design, with seven fractions of the mean label dose of the herbicide 2,4-D choline salt formulation (0 (control); 0.4275; 0.855; 1.71; 3.42; 8.55; 17.1 g a.e. ha^-1), associated with three different phenological stages of cotton: V4, B4 and C4. The lint samples were analyzed by the HVI (High Volume Instruments) equipment to determine the main fiber quality characteristics. No sub-dose of the 2,4-D choline salt herbicide affected the fiber quality variables. Contaminations of 2,4-D choline salt at the V4 and B4 stages of cotton directly influence the visual effects of damage and some quality characteristics of cotton fiber, showing that contamination of the herbicide in the initial stages of plant development drastically compromises the crop. The fiber quality variables of cotton plants in the C4 stage were not influenced by the application of 2,4-D choline salt, with no risk if accidental contamination occurs in this stage.

Keywords:
Synthetic auxin; Gossypium hirsutum L.; 2,4-dichlorophenoxyacetic acid; High Volume Instruments

	2018
	SFI (%)			STR (gf tex^-1)			MIC (µg pol^-1)
Stage	V4	B4	C4	V4	B4	C4	V4	B4	C4
Mean	8.2	8.0	7.9	29.2	29.8	29.6	4.1	4.1	4.1
F Doses (D)		0.14 ^NS			0.75 ^NS			0.71 ^NS
F Stages (S)		0.40 ^NS			2.12 ^NS			0.63 ^NS
F (D x S)		1.11 ^NS			1.49 ^NS			0.77 ^NS
F Blocks		2.13 ^NS			3.06 ^* *Significant at 5% probability; NS – not significant. Means followed by the same uppercase letter in the line do not differ statistically from each other by the Tukey test (p<0.05).			0.23 ^NS
CV (%)		14.86			3.97			5.24
	2019
	SFI (%)			STR (gf tex^-1)			MIC (µg pol^-1)
Stage	V4	B4	C4	V4	B4	C4	V4	B4	C4
Mean	7.7	7.5	7.5	28.4	29.5	29.8	4.3 b	4.3 b	4.4 a
F Doses (D)		1.67 ^NS			1.83 ^NS			1.41 ^NS
F Stages (S)		0.86 ^NS			2.67 ^NS			3.40 ^* *Significant at 5% probability; NS – not significant. Means followed by the same uppercase letter in the line do not differ statistically from each other by the Tukey test (p<0.05).
F (D x S)		1.06 ^NS			1.29 ^NS			1.08 ^NS
F Blocks		0.83 ^NS			0.80 ^NS			0.59 ^NS
CV (%)		10.44			3.44			3.70

	2018
	MAT (%)			ELG (%)			+b
Stage	V4	B4	C4	V4	B4	C4	V4	B4	C4
Mean	85.7	85.8	85.7	6.3 ab	6.2 b	6.5 a	6.3 ab	6.4 a	6.1 b
F Doses (D)		0.84 ^NS			0.90 ^NS			1.47 ^NS
F Stages (S)		0.23 ^NS			3.36 ^* *Significant at 5% probability; NS – not significant. Means followed by the same uppercase letter in the line do not differ statistically from each other by the Tukey test (p<0.05).			5.40 ^* *Significant at 5% probability; NS – not significant. Means followed by the same uppercase letter in the line do not differ statistically from each other by the Tukey test (p<0.05).
F (D x S)		0.43 ^NS			0.97 ^NS			1.80 ^NS
F Blocks		0.30 ^NS			0.31 ^NS			1.95 ^NS
CV (%)		0.69			6.98			5.25
	2019
	MAT (%)			ELG (%)			+b
Stage	V4	B4	C4	V4	B4	C4	V4	B4	C4
Mean	86.2	86.1	86.3	6.3 b	6.3 b	6.4 a	8.9	9.1	8.8
F Doses (D)		0.89 ^NS			1.35 ^NS			0.94 ^NS
F Stages (S)		1.63 ^NS			3.42 ^* *Significant at 5% probability; NS – not significant. Means followed by the same uppercase letter in the line do not differ statistically from each other by the Tukey test (p<0.05).			2.80 ^NS
F (D x S)		1.11 ^NS			0.95 ^NS			1.39 ^NS
F Blocks		0.63 ^NS			2.80 ^* *Significant at 5% probability; NS – not significant. Means followed by the same uppercase letter in the line do not differ statistically from each other by the Tukey test (p<0.05).			2.39 ^NS
CV (%)		0.60			2.59			4.49

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[1] *Author for correspondence

	2018
	SCI			UHM (mm)			UNF (%)
Stage	V4	B4	C4	V4	B4	C4	V4	B4	C4
Mean	141.2	145.2	142.8	30.2	30.2	30.2	82.9	83.4	83.2
F Doses (D)		0.28^NS			0.28^NS			0.59^NS
F Stages (S)		1.62^NS			0.34^NS			1.65^NS
F (D x S)		1.29^NS			1.32^NS			0.96^NS
F Blocks		1.48^NS			2.86^* * Significant at 5% probability; NS - not significant.			0.80^NS
CV (%)		5.93			2.33			1.27
	2019
	SCI			UHM (mm)			UNF (%)
Stage	V4	B4	C4	V4	B4	C4	V4	B4	C4
Mean	138.8	139.0	140.6	30.7	30.7	30.7	83.1	83.0	83.4
F Doses (D)		2.01^NS			1.66^NS			0.99^NS
F Stages (S)		0.46^NS			0.22^NS			0.94^NS
F (D x S)		1.58^NS			0.85^NS			1.12^NS
F Blocks		0.34^NS			1.31^NS			0.41^NS
CV (%)		5.57			1.98			1.45

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Effect of sub-doses of 2,4-D choline salt on the characteristics of cotton fiber1 1 Parte da Dissertação do primeiro autor, apresentada ao Curso de Pós-Graduação em Agronomia (Produção Vegetal), Universidade Federal de Goiás/UFG - Regional Jataí

Efeito de subdoses de 2,4-D sal colina nas características da fibra do algodoeiro

ABSTRACT

Effect of sub-doses of 2,4-D choline salt on the characteristics of cotton fiber¹ 1 Parte da Dissertação do primeiro autor, apresentada ao Curso de Pós-Graduação em Agronomia (Produção Vegetal), Universidade Federal de Goiás/UFG - Regional Jataí