SORPTION OF INDAZIFLAM IN BRAZILIAN SOILS WITH DIFFERENT pH VALUES<sup/>

GONÇALVES, VALDINEI ARAÚJO; FERREIRA, LINO ROBERTO; TEIXEIRA, MATHEUS FERREIRA FRANÇA; FREITAS, FRANCISCO CLÁUDIO LOPES DE; D’ANTONINO, LEONARDO

doi:10.1590/1983-21252021v34n301rc

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Article • Rev. Caatinga 34 (3) • Jul-Sep 2021 • https://doi.org/10.1590/1983-21252021v34n301rc copy

SORPTION OF INDAZIFLAM IN BRAZILIAN SOILS WITH DIFFERENT pH VALUES¹ 1 Received for publication in 11/12/2019; accepted in 01/22/2021. Paper extracted from the doctoral thesis of the first author.

SORÇÃO DO INDAZIFLAM EM SOLOS DO BRASIL COM DIFERENTES VALORES DE pH

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Pre-emergence herbicides, such as indaziflam, have agronomic efficiency when available in the soil solution, mainly in the superficial layer (0-10 cm), the region with the highest concentration of weed seed bank. However, information about the sorption of indaziflam in Brazilian soils still is scarce, since most studies available in the literature were conducted in soils of temperate regions. The objective of this study was to estimate the sorption of indaziflam using high-performance liquid chromatography (HPLC) and bioassay in a Latossolo Vermelho-Amarelo (Oxisol) and in a Cambissolo (Inceptisol), at pH values of 5.1 and 6.1. In the biossay, Sorghum bicolor was used as an indicator plant. Quantitative indaziflam data were obtained by HPLC, and the sorption and desorption coefficients were determined in the soils using Freundlich isotherms. Increasing the pH of the two soils from 5.1 to 6.1 resulted in reductions of C₅₀ and sorption coefficient values. Desorption, a parameter estimated only by HPLC, showed an inverse behavior to that of sorption, that is, the lowest desorption was observed in the condition of highest sorption. It is concluded that the increase in pH of the studied soils reduces indaziflam sorption, influencing the recommendations of this herbicide, from both the agronomic and the environmental points of view. When the goal is to verify the presence or absence of indaziflam in the studied soils, the bioassay technique has satisfactory efficiency. Chromatographic assay is necessary when quantifying the concentration of this herbicide in the soil.

Keywords:
Herbicide in soil; Environmental impact; Bioassay; HPLC

Physical Analysis
Soil	Sand			Silt				Clay			Textural class
Soil	(dag Kg^-1)
LVA – Viçosa, MG	43.0			7.0				50.0			Textural class		Sandy clay
CX – Santa Vitória, MG	81.0			4.0				15.0			Loamy sand
Chemical Analysis
Soil	pH	P	K	Ca	Mg²⁺	Al³⁺	H + Al	SB	T	T	V	m	OM
	(H₂O)	(mg dm^-3;)		(cmol_c dm^-3;)							(%)		(dag kg^-1)
LVA – Viçosa, MG Without liming	5.1	2.2	33	3.4	0.1	0.00	5.45	3.58	3.58	9.03	40	0	3.47
LVA – Viçosa, MG With liming	6.1	2.9	41	4.7	0.1	0.00	3.30	4.90	4.90	8.20	60	0	3.47
CX – Santa Vitória, MG Without liming	5.1	69.6	23	1.0	0.6	0.2	2.97	1.66	1.86	4.63	36	11	1.86
CX – Santa Vitória, MG With liming	6.1	71.9	27	2.7	1.0	0.0	1.30	3.70	3.70	5.20	56	12	1.86

Substrate	Intoxication		Total dry matter
Substrate	C₅₀ (g ha^-1)	SR	C₅₀ (g ha^-1)	SR
Inert substrate	0.39	-	0.23	-
LVA – pH = 5.1	15.39	38.46	4.93	20.43
LVA – pH = 6.1	10.92	27.00	3.82	15.61
CX – pH = 5.1	5.04	11.92	2.42	9.52
CX – pH = 6.1	3.40	7.71	2.01	7.74

Universidade Federal Rural do Semi-Árido Avenida Francisco Mota, número 572, Bairro Presidente Costa e Silva, Cep: 5962-5900, Telefone: 55 (84) 3317-8297 - Mossoró - RN - Brazil
E-mail: caatinga@ufersa.edu.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Corresponding author

Sorption coefficients	LVA		CX
Sorption coefficients	pH 5.1	pH 6.1	pH 5.1	pH 6.1
Kf	3.1296	2.2927	2.4698	1.4733
1/n	0.7239	0.7652	0.8388	0.9586
R²	0.90	0.98	0.95	0.96
Desorption coefficients
Kf	1.2655	1.3118	2.4273	1.3835
1/n	0.7611	0.9056	0.5810	1.0298
R²	0.99	0.98	0.89	0.79
H	0.9511	0.8449	1.4437	0.9309

Brasil

Brasil

SORPTION OF INDAZIFLAM IN BRAZILIAN SOILS WITH DIFFERENT pH VALUES1 1 Received for publication in 11/12/2019; accepted in 01/22/2021. Paper extracted from the doctoral thesis of the first author.

SORÇÃO DO INDAZIFLAM EM SOLOS DO BRASIL COM DIFERENTES VALORES DE pH

ABSTRACT

SORPTION OF INDAZIFLAM IN BRAZILIAN SOILS WITH DIFFERENT pH VALUES¹ 1 Received for publication in 11/12/2019; accepted in 01/22/2021. Paper extracted from the doctoral thesis of the first author.