Dynamics and efficacy of sulfentrazone, flumioxazin, and isoxaflutole herbicides applied on eucalyptus harvest residues
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Dynamics and efficacy of sulfentrazone, flumioxazin, and isoxaflutole herbicides applied on eucalyptus harvest residues Caio Antonio Carbonari1 · Giovanna Larissa Gimenes Cotrick Gomes1 · Fábio Henrique Krenchinski1 · Plinio Saulo Simões1 · Edicarlos Batista de Castro1 · Edivaldo Domingues Velini1 Received: 24 April 2019 / Accepted: 15 October 2019 © Springer Nature B.V. 2019
Abstract Eucalyptus harvests generate residues that remain on the soil and affect the efficacy of preemergent herbicides in the following planting cycle. The objective of this work was to evaluate the dynamics of flumioxazin, sulfentrazone, and isoxaflutole herbicides applied on different amounts and compositions of eucalyptus harvest residues subjected to differ‑ ent rainfall depths; and evaluate the weed control effectiveness of these herbicides when applied under these conditions. A LC–MS/MS system was used for the evaluations and the results showed that a cumulative rainfall of 50 mm was sufficient for the maximum removal of herbicides from the eucalyptus residues, regardless of the residue composition. The amount of the flumioxazin, sulfentrazone, and isoxaflutole herbicides that reached the soil was lower in the treatment with the highest amount of eucalyptus harvest residue used (40 Mg ha−1). The greatest amount of herbicide reaching the soil was found with the use of 15 Mg ha−1 of residues without presence of bark. The highest amount of residue used (40 Mg ha−1) reduced the control of Brachiaria decumbens by sulfentrazone and isoxaflu‑ tole. The control of Commelina benghalensis was inefficient (> 80%) in the treatment with 15 Mg ha−1 of residues without barks, regardless of the herbicide. Sulfentrazone controlled Ipomoea grandifolia (> 90%) under the evaluated residue conditions. Spermacoce latifolia and Sida rhombifolia were controlled by all herbicides in the evaluated residue conditions. Isoxaflutole controlled Panicum maximum in all residue conditions. The choice between the herbicides depends on the residue condition, rainfall regime, and weed species to be controlled. Keywords Preemergent herbicides · Herbicide dynamics · Soil cover · Brachiaria decumbens · Ipomoea grandifolia · Panicum maximum
* Fábio Henrique Krenchinski [email protected] 1
School of Agriculture of the São Paulo State University (Unesp), Av. Universitária, 3780 ‑ Altos do Paraíso, Fazenda Experimental Lageado, Botucatu, SP CEP 18610‑034, Brazil
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New Forests
Introduction Eucalyptus plantations provide renewable energy and recovery of degraded areas and contribute to atmospheric CO2 sequestration (Olivette et al. 2011). Weeds in these plan‑ tations negatively affect the growth, development, and productivity of eucalyptus plants (Toledo 1998; Brendolan et al. 2000; Costa et al. 2002; Toledo et al. 2003; Dinardo et al. 2003). Weed management is an important cultural practice from implementation to establishment of eucalyptus plantations (Toledo et al. 2003; Machado et al. 2009). The use of herbicides, especia
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