Levantamento do banco de sementes em dois sistemas de manejo de solo irrigados por pivô central

Lacerda, André Luiz de Souza; Filho, Ricardo Victória; Mendonça, Cristiane Gonçalves de

doi:10.1590/s0100-83582005000100001

Cited by 23 publications

(19 citation statements)

References 9 publications

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“…The density of viable seeds found in the soil weed seed bank in the present study (3,859 seeds m −2 ) is lower than the values reported by Carmona (1995) for the savanna of central Brazil-22,313 seeds m −2 in lowland areas and 6,768 seeds m −2 in areas of crop rotation (soybean, fallow, bean)-as well as the 6,188 seeds m −2 reported by Lacerda et al (2005) in conventional tillage in the state of São Paulo, in southeastern Brazil, the 48,821 seeds m −2 found in a study conducted in Africa (Buah et al 1996) and the 5,313 seeds m −2 reported for cassava fields in the state of Amazonas, in northern Brazil (Costa et al 2009). However, it is higher than the 451 seeds m −2 found by Gasparino et al (2006), in crop fields in the state of Paraná, in southern Brazil, and the 2,028 seeds m −2 found by Isaac & Guimarães (2008) in direct seeding in the state of Mato Grosso, in western Brazil.…”

Section: Discussioncontrasting

confidence: 85%

“…Various studies recently conducted in the tropics have been aimed at identifying weed species in crop fields, in pastures and in the corresponding seed banks (Silva & Dias-Filho 2001;Lacerda et al 2005;Begum et al 2006;Lopes et al 2006;Ikeda et al 2008;Isaac & Guimarães 2008;Andrade et al 2009;Costa et al 2009;Kamoshita et al 2010). However those studies were focused on agribusiness rather than on generating scientific knowledge for use in subsistence farming.…”

Section: Introductionmentioning

confidence: 99%

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Floristic diversity of the soil weed seed bank in a rice-growing area of Brazil: in situ and ex situ evaluation

2013

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The objective of this study was to compare the ex situ and in situ floristic diversity of the soil weed seed bank of a rice field in northeastern Brazil. In a rice field in the county of Bacabal, located in the state of Maranhão, thirty 25-m 2 plots were laid out. From 15 plots, soil samples (6/plot; n = 90) were taken with a soil probe (25 × 16 × 3 cm) and placed in aluminum trays in the greenhouse. From the remaining 15 plots, weed samples (6/plot; n = 90) were taken with the same soil probe. The number of seeds was estimated by germination. We evaluated the numbers of species and individuals, as well as the density, frequency, abundance and importance value (IV) for each species. Diversity was computed by the Shannon index (H'). We recorded 13,892 individuals (among 20 families, 40 genera and 60 species), of which 11,530 (among 50 species) germinated ex situ and 2,362 (among 34 species) germinated in situ. The family Cyperaceae had the highest number of species (16), followed by Poaceae (10). The dominant species, in situ and ex situ, were Schoenoplectus juncoides (IV=47.4%) and Ludwigia octovalvis (IV=34.8%), respectively. Floristic diversity was higher ex situ (H'=2.66). The information obtained here could help determine the infestation potential of these species, which could lead to improved management strategies.

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Section: Discussioncontrasting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Floristic diversity of the soil weed seed bank in a rice-growing area of Brazil: in situ and ex situ evaluation

2013

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“…Shiratsuchi et al (2005) also reported that most studies that focused on weeds mapping had as a primary concern mapping the emerging flora during the critical cycle of interference, being the only few studies on spatial variability of weeds in the course of the crop cycle. Allied to this, studies focusing on weed parameters analysis of species diversities of the communities try to determine the degree of infestation, being one of the first steps in studying the weeds dynamics and the choice of strategies control (Lacerda et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of weeds in an Oxisol under no-tillage system

Siqueira¹,

Silva²,

Aguiar³

et al. 2016

Afr. J. Agric. Res.

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In the global agribusiness, the herbicide use is a major problem for sustainable production, in this sense, it is necessary to better understand the interaction of weed species and floristic composition such as biodiversity indicators. The objective of this study was to analyze the spatial variability of weeds in an Oxisol under no-tillage system. Samples were taken in an area of 0.5 ha, in 50 sampling points with spacing of 5 m x 10 m. Data were analyzed by means of classical statistics, geostatistics, and spatial variability of the constructed maps by the interpolation by kriging technique. All the species of weeds presented in the study area showed spatial variability with the exception of Ipomoea triloba (L.) and Heliotropium indicum (L.), which showed pure nugget effect. The range values (a) shows that the spacing between samples can be extended to all species of weeds. The study was unable to determine specifics areas of management in the local since the different species of weed infested different plots of the area.

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“…Research on identification and quantification of weed species germinated in the soil seed bank from cropping fields were carried out by numerous authors (Andrade et al, 2009;Begum et al, 2006;Costa et al, 2009;Gasparino et al, 2006;Ikeda et al, 2008;Isaac & Guimarães, 2008;Kamoshita et al, 2010;Lacerda et al, 2005;Lopes et al, 2006;Mesquita et al, 2014). However, greenhouse or field weed seed bank assessments in rice intercropped with corn fields have not been documented previously.…”

Section: Introductionmentioning

confidence: 99%

Germination, floristic composition and phytosociology of the weed seed bank in rice interropped with corn fields

Mesquita¹,

Andrade²,

Pereira

2016

Agraria

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Germination, floristic composition and phytosociology in the soil weed seed bank are important to know the weed flora and to predict weed infestations. The objective of this research was to assess and to compare germination, the weed flora and phytosociology of the soil weed seed bank in rice intercropped with corn fields in Maranhão State, northeastern Brazil by the germination method in the greenhouse and by weed sampling in the field. Phytosociological parameters computed were frequency, density, abundance and the importance value of each species. Diversity was assessed by the Shannon's Diversity Index. We recorded a total of 1,998 individuals from 40 species, 31 genera and 16 families from which 1,339 individuals germinated in the greenhouse and 659 in the field. Weed density was higher in the greenhouse (878 plants m ). The Cyperaceae family had the highest floristic richness with 12 species. The dominant species based on the importance value were Scleria lithosperma (IV = 37.0%) in the greenhouse and Lindernia crustacea (IV = 27.7%) in the field. Floristic diversity was higher in the greenhouse with H' = 2.66. These results could help to predict weed infestation potential and could lead to improved weed management practices in rice intercropped with corn fields in Maranhão State.Key words: competition, Cyperaceae, importance value, intercropping Germinação, composição florística e fitossociologia no banco de sementes de plantas invasoras em áreas de arroz consorciado com milho RESUMO Germinação, composição florística e fitossociologia de espécies presentes no banco de sementes no solo são importantes para conhecer a flora e prever infestações de plantas invasoras. Objetivou-se avaliar e comparar a germinação, a flora invasora e a fitossociologia no banco de sementes do solo em áreas de arroz consorciado com milho no Estado do Maranhão, pelo método de germinação em bandejas, em casa de vegetação e no campo, pelo método de amostragem de plantas. Os parâmetros fitossociológicos calculados foram frequência, densidade, abundância e o valor de importância para cada espécie. A diversidade foi calculada pelo Índice de Diversidade de Shannon. Registrou-se o total de 1.998 indivíduos de 40 espécies, 31 gêneros e 16 famílias, dos quais 1.339 individuos de 29 espécies germinaram na casa de vegetação e 639 indivíduos de 29 espécies, no campo. A densidade foi maior na casa de vegetação com 878 plantas m -2 . A família Cyperaceae teve a maior riqueza florística com 12 espécies. As espécies dominantes foram Scleria lithosperma (VI = 37.0%) na casa de vegetação e Lindernia crustacea (VI = 27.7%) no campo. A diversidade florística foi maior na casa de vegetação com H' = 2.66. Estes resultados podem contribuir para a previsão de infestações e para subsidiar práticas de manejo de plantas invasoras em áreas de cultivo de arroz consorciado com milho no Maranhão.Palavras-chave: competição, Cyperaceae, consorciação de culturas, valor de importância

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Levantamento do banco de sementes em dois sistemas de manejo de solo irrigados por pivô central

Abstract: 0-2.5, 2.5-5.0, 5.0-10.0, 10.0-15.0 and 15.0-20.0 cm, placing

Cited by 23 publications

References 9 publications

Floristic diversity of the soil weed seed bank in a rice-growing area of Brazil: in situ and ex situ evaluation

Floristic diversity of the soil weed seed bank in a rice-growing area of Brazil: in situ and ex situ evaluation

Spatial variability of weeds in an Oxisol under no-tillage system

Germination, floristic composition and phytosociology of the weed seed bank in rice interropped with corn fields

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