Parameters of the Phytosociological Survey to Evaluate the Abundance, Distribution, and Diversity of the Weed Community

Souza, Wendel Magno de; Paiva, Maria Carolina Gomes; Zaidan, Úrsula Ramos; Mendes, Kássio Ferreira; Freitas, Francisco Cláudio Lopes de

doi:10.1007/978-3-031-01938-8_3

Cited by 2 publications

(2 citation statements)

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“…The phytosociological survey was carried out at 35 DAE at the time of initial development of the sunflower and at pre-harvest at 100 DAE using the quadrate method [18]. A 0.5 × 0.5 m quadrate was dropped at random 160 times within each one-hectare area.…”

Section: Phytosociological Surveymentioning

confidence: 99%

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Influence of Chemical Control on the Floristic Composition of Weeds in the Initial and Pre-Harvest Development Stages of the Sunflower Crop

et al. 2023

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The presence of weeds in the sunflower crop is one of the main factors linked to the low increase in productivity of this crop, and to determine the most appropriate management of weeds, it is essential to carry out a diagnosis through the phytosociological survey. The objective of this study was to assess the influence of chemical control on the phytosociological community of weeds in three areas cultivated with sunflower in the Parecis region (Brazil). The areas were treated with 2,4-D + glyphosate for desiccation; S-metolachlor was used for pre-emergence control in the three areas; meanwhile, sulfentrazone and flumioxazin were applied only in one area; and, finally, clethodim was applied for post-emergence weed management. Sampling was carried out at two different times, in the initial and pre-harvest stages (at 35 and 100 days after the emergence of the crop, respectively), using a quadrate, in which weeds were identified and quantified to determine the frequency, relative frequency, density, relative density, abundance, relative abundance, importance index, and similarity index between areas and times. Seventeen weed species were found in the sunflower crop (70.6% dicot and 29.4% monocotyledonous) in the two seasons, grouped into nine botanical families, with Poaceae being the most diverse family. The dicots Tridax procumbens and Acanthospermum hispidium were present in low frequency only in the initial stages of development of the sunflower crop. The weeds with the highest importance index values in the initial and pre-harvest stages were Euphorbia hirta (104 and 91%) and Bidens pilosa (45 and 66%, respectively), both belonging to the dicots group. These two species were present in the two evaluated periods and in the three experimental areas, demonstrating that there was a similarity index between them with values above 93%. These results of the phytosociological study may contribute to determining more efficient management strategies for weed chemical control in the sunflower crop.

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Section: Phytosociological Surveymentioning

confidence: 99%

“…The frequency (1), relative frequency (2), density (3), relative density (4), abundance (5), relative abundance (6), and the importance value index (IVI) (7) were calculated and analyzed for the analysis of the weed population in the experimental areas using the following formulas [18,20,21]:…”

Section: Phytosociological Surveymentioning

confidence: 99%