Phytosociological variability of weeds in soybean field

Santi, Antônio Luis; Bona, Stefano; Lamego, Fabiane Pinto; Basso, Claudir José; Eitelwein, Mateus Tonini; Cherubin, Maurício Roberto; Kaspary, Tiago Edu; Ruchel, Q.; Gallon, Mônica da Silva

doi:10.1590/s0100-83582014000100005

Cited by 8 publications

(9 citation statements)

References 19 publications

(17 reference statements)

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“…The most representative families and with greater importance value index (IVI) in both collection stages were Poaceae, Amaranthaceae, Asteraceae and Malvaceae. Santi et al (2014), when assessing the phytosociological variability of weeds in a soy tillage area in Boa Vista das Missões, RS, observed that the families Poaceae and Asteraceae were the ones more occurring in the area. However, Cruz et al (2009), in a study carried out in an area rotated with crops of soy, corn and rice, Phytosociological survey of weeds in cultivars of common beans ... Salgado et al (2007), when assessing the interference of weeds in the carioca bean plant, with undetermined growth habit (Type III) in Jaboticabal-SP, obtained weeds composed by 13 species of weeds, 62% of them dicotyledons and 38% of monocots.…”

Section: Resultsmentioning

confidence: 99%

Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

et al. 2016

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-The objective of this paper was to characterize the phytosociology of weeds in function of different types of growth of common bean cultivars in the North of Minas Gerais. The study was conducted in the experimental area, located in the municipality of Janaúba, MG. The treatments consisted of eight commercial cultivars of common beans with different types of growth. The design was done in randomized blocks, with three replications. The soil preparation was conventional and the planting was done in June, with manual seeders, with a 0.5 m spacing between rows. The phytosociological survey was performed in two phases of bean cultivation, in stages V3 and R8. The method used was the square inventory one, with a 0.25 m 2 frame, randomly released once in each plot. Samples of each square were identified and quantified by family, genus and species, and the sampled plants were collected with their complete structure. Next, the material was sent to a drying greenhouse with forced air circulation at 65 o C for 72 hours, for drying and determination of weight of dry matter. We also estimated the Relative Frequency, Relative Density and Relative Abundance to determine the importance value index and similarity index. At the V3 stage, the species Sorghum halepense, Brachiaria plantaginea and Boerhavia diffusa had higher importance value indexes. At the R8 stage, the Amaranthus viridis specie showed higher importance value index and dry matter. In more prostrate cultivars, the weeds present lower importance value indexes at the R8 stage.

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Section: Resultsmentioning

confidence: 99%

Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

et al. 2016

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“…Several authors have adopted geostatistics to study the spatial variability of weeds in the corn crop (Calha et al, 2014), soybeans crops (Santi et al, 2014), in the cultivation of grains and cover crops (Chiba et al, 2010) and sunflower crops (Siqueira et al, 2016). However, studies on the spatial distribution of the weed or invasive bank both in cultivation areas and in areas of native vegetation are scarce in the literature.…”

Section: Journal Of Agricultural Studiesmentioning

confidence: 99%

Spatial Distribution of Weed Seed Banks in the Agricultural Field and Anthropized Cerrado

Lopes

Silva

Costa

et al. 2020

JAS

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Characterization of the seeds bank is an essential tool for decision making on weed control and management practices and the study and maintenance of the ecological dynamics of natural areas. In this context, the present study aimed to characterize the spatial variability of the seeds bank in an experimental agricultural field and an anthropized cerrado area, using the ordinary kriging geostatistical technique. Sampling was carried out on 10x10 regular grids in two different environments. Area 01 consisted of an experimental agricultural field of annual crops (soy and corn); area 02 represented the anthropized cerrado. The sample grids consisted of 25 points collected at a depth of 0.00-0.20 m. The soil samples were placed in 6.38 dm3 and 0.05 m² plastic containers. Spatial distribution maps of the species found have been drawn up, grouped in dicotyledonous, monocotyledonous, and total density, in addition, the density of three weeds most found in each area. The weed seed bank present strong spatial variability to 01 and 02, which indicates behavior in spots or in patches for both dicotyledonous and monocotyledonous plants, especially Mollugo verticillata L. and Eleusine indica (L.) Gaertn. in the experimental field, and for Richardia scabra L. and Eleusine indica (L.) Gaertn. in the anthropized cerrado. The ordinary kriging technique made it possible to map the weed seed bank and, therefore, it may work as an efficient tool in controlling weeds in agricultural fields, especially in its pre-emergence phase. Furthermore, it can assist in the recovery of native anthropized vegetation.

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“…Dessa forma, os dados de modelagem podem ser utilizados como parâmetros para monitorar o fluxo de emergência de plantas daninhas, através de informações climáticas de satélites e/ou estações meteorológicos. Com essas informações é possível georreferenciar áreas e confeccionar mapas mais rapidamente para aplicar herbicidas com precisão, quando e onde o nível de dano econômico é atingido (Santi et al, 2014).…”

Section: Impactos Práticosunclassified

Modelagem matemática do fluxo de emergência de plantas daninhas: ferramenta para decisão no manejo de cultivos

2018

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Resumo -O surgimento de biótipos de plantas daninhas resistentes a herbicida e o aumento da pressão social para reduzir sua utilização, criou a necessidade de desenvolver ferramentas para aperfeiçoar a aplicação de herbicidas e melhorar o controle de plantas daninhas. Desta forma, o desenvolvimento de modelos de emergência de plantas daninhas tornou-se crucial para o desenvolvimento de estratégias de gerenciamento em áreas agrícolas. Esta revisão tem por objetivo apresentar os fatores que influenciam o fluxo de emergência de plantas daninhas, os principais modelos utilizados, os procedimentos da modelagem e os impactos práticos de sua utilização no manejo. O fluxo de emergência das plantas daninhas correlaciona-se diretamente com padrões de resposta das sementes à interferência dos fatores ambientais e práticas culturais. Os modelos de emergência empíricos e mecanicistas desenvolvidos permitem prever a emergência de plantas daninhas em diferentes anos e regiões geográficas, baseados em condições climáticas e ecofisiológicas. Os modelos mecanicistas são mais complexos e permitem a melhor compreensão sobre a emergência de plantas daninhas, enquanto modelos empíricos apresentam a simplicidade e a flexibilidade necessária para a tomada de decisão de controle. O conhecimento do fluxo de emergência de plantas daninhas permite desenvolver estratégias de manejo que proporcionam maior habilidade competitiva à cultura e, em decorrência, menores perdas de produtividade; bem como a seleção de medidas de controle que diminuam a utilização de herbicidas, a contaminação ambiental e aprimorem as tecnologias utilizadas na agricultura. Palavras-chave: modelo empírico, gerenciamento, tempo hidrotérmico Abstract -The appearance of weed biotypes resistant to herbicides and the increase in social pressure to reduce its use, created the need to develop tools to refine herbicides application and improve weed control. In this way, the development of weed emergence models has become crucial for the development of management strategies in agricultural areas. The objective of this review is to show the factors that influence the emergence flow and the main models used to predict weed emergence, the procedures of modeling and the practical impacts of their use for weed management. The emergence flow of weeds correlates directly with seed response patterns to the interference of environmental factors and cultural practices. The developed empirical and mechanistic emergence models allow predict weeds emergence in different years and geographic regions, based on climatic and ecophysiological conditions. However, mechanistic models are more complex and allow better

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Phytosociological variability of weeds in soybean field

Cited by 8 publications

References 19 publications

Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

Phytosociological Survey of Weeds in Cultivars of Common Beans With Different Types of Growth in the North of Minas Gerais

Spatial Distribution of Weed Seed Banks in the Agricultural Field and Anthropized Cerrado

Modelagem matemática do fluxo de emergência de plantas daninhas: ferramenta para decisão no manejo de cultivos

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