Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas de cultivo e corretivo de acidez

Braga, Renan Rodrigues; Cury, J.P.; Santos, J.B.; Byrro, E.C.M.; Silva, Daniel Valadão; Carvalho, Frédéric A.; Ribeiro, Karina Guimarães

doi:10.1590/s0034-737x2012000500010

Cited by 9 publications

(10 citation statements)

References 21 publications

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“…For values above 25%, it is said that the species are adapting themselves to the current growing system, remaining their genotypes through seed bank (Table 2). These values were higher than those found by Braga et al (2012), who estimated this index for species found in no-till and conventional tillage, with or without limestone applications and at different times of evaluation. These authors found a value of 81.1%, which is considered high.…”

Section: Resultscontrasting

confidence: 75%

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Phytosociology of weed community in two vegetable growing systems

Barros¹,

Reis²,

Magalhães³

et al. 2018

Afr. J. Agric. Res.

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The aim of this study was to perform a phytosociological survey of the weed community present in organic and conventional vegetable growing systems conducted in Alagoas state, in Brazil. The survey was carried out from February 2014 to January 2016, within which 30 samplings were made. The evaluated parameters were given by the calculation of frequency, density, abundance, relative frequency, relative density, similarity index (SI) and importance value index (IVI) for each species. In total, 299 weed species were identified, which were grouped into 11 botanical families: Amaranthaceae, Asteraceae, Commelinaceae, Cyperaceae, Euphorbiaceae, Malvaceae, Molluginaceae, Phyllantaceae, Poaceae, Rubiaceae and Solanaceae. The Euphorbiaceae family in conventional farming, stood out, since it showed an importance value index (IVI) more than, the Amaranthaceae family in the organic farming. In the conventional cultivation, IVI was of 91.53% for Asteraceae and 46.95% for Poaceae. Moreover, a major diversity of weed species was observed in organic cultivation, being superior to conventional one in all phytosociological parameters.

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Section: Resultscontrasting

confidence: 75%

“…In this environment, mulch is widely used, which hampers germination of soil seed bank. Nevertheless, this system presents a greater diversity of weeds compared to the conventional farming system growing the same vegetables (Braga et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Phytosociology of weed community in two vegetable growing systems

Barros¹,

Reis²,

Magalhães³

et al. 2018

Afr. J. Agric. Res.

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“…Segundo Fleck et al (2003), S. rhombifolia é a espécie de guanxuma mais disseminada e de controle mais problemático em diferentes ambientes agrícolas do País. Além da competição por recursos do ambiente, como água, luz e nutrientes, a guanxuma pode dificultar a colheita mecanizada, por possuir caules muito lignificados e resistentes (Parreira et al, 2012), atuar como hospedeira de microplasmas de importância fitossanitária, que causam a doença conhecida como virose das malváceas (Souza et al, 2011;Fiallo-Olivé et al, 2012), e ser tóxica a animais de pastejo (Pellegrini et al, 2007;Braga et al, 2012).…”

Section: Introductionunclassified

Crescimento e nutrição mineral de Sida rhombifolia

Bianco

Carvalho²,

Bianco

2014

Planta daninha

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RESUMO -O experimento foi conduzido com o objetivo de analisar a produção e a distribuição de massa seca e os teores e os acúmulos dos macronutrientes em plantas de guanxuma (Sida rhombifolia) cultivadas em condições padronizadas de nutrição mineral. As plantas cresceram em vasos de sete litros com substrato de areia, que foram irrigados diariamente com solução nutritiva e mantidos em condições de casa de vegetação. Os tratamentos corresponderam às épocas de avaliação (21, 35, 49, 63, 77, 91, 105, 119 e 133 dias após a emergência -DAE) e foram arranjados em delineamento experimental inteiramente casualizado com quatro repetições. As plantas de guanxuma apresentaram pequeno acúmulo de massa seca (0,3 g por planta) e de macronutrientes (6,9 mg N por planta; 0,7 mg P por planta; 8,6 mg K por planta; 4,9 mg Ca por planta; 2,6 mg Mg por planta; e 0,3 mg S por planta) na fase vegetativa (<49DAE). Esses acúmulos se intensificaram, principalmente, após 63 DAE; a taxa diária de acúmulo foi crescente até 94 DAE (massa seca -MS), 89 DAE (N e P), 98 DAE (K), 95 DAE (Ca e S) e 93 DAE (Mg), quando houve acúmulo de 26,3 g MS por planta, 402,6 mg N por planta, 45,6 mg P por planta, 359,3 mg K por planta, 337,6 mg Ca por planta, 71,9 mg Mg por planta e 20,9 mg S por planta. N e K foram os macronutrientes com maiores teores e, consequentemente, mais requeridos e acumulados em maior quantidade nos tecidos vegetais das plantas de guanxuma.Palavras-chave: guanxuma, planta daninha, crescimento, nutrição mineral. (21, 35, 49, 63, 77, 91, 105, 119, and 133 days after emergence -DAE) and were arranged in a completely randomized design with four replicates. Arrowleaf sida plants showed small accumulation of dry mass (0.3 g per plant) and macronutrients (6.9 mg N per plant, 0.7 mg P per plant, 8.6 mg K per plant, 4.9 mg Ca per plant, 2,6 mg Mg per plant, and 0.3 mg S per plant) at the vegetative growth stage (< 49 DAE). Those accumulations increased, mainly after 63 DAE, and the daily accumulation rate was crescent up to 89 DAE (N and P), 98 DAE (K), 95 DAE (Ca and S), and 93 DAE (Mg), when there was accumulation of 26.3 g DM per plant, 402.6 mg N per plant, 45.6 mg P per plant, 359.3 mg K per plant, 337.6 mg Ca per plant, 71.9 mg Mg per plant, and 20.9 mg S per plant. N and K ABSTRACT -This experiment was carried out to analyze dry mass production and distribution, and the content and accumulation of macronutrients in arrowleaf sida (Sida rhombifolia) plants cultivated under mineral nutrition standard conditions. Plants grew in seven liter pots filled with sand substrate and daily irrigated with nutrient solution, under greenhouse conditions. Treatments consisted of times of evaluation

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“…Atrazine is the main herbicide used in maize, its application is held in the early maize development, and in pre-or post-emergence of weeds. However in crop-livestock integration, the use of this herbicide only in one application may not be enough, because the weeds are important even after the critical period of competition with annual crop and it is not interesting that the chosen forage it develops under high infestation levels of weeds [4].…”

Section: Introductionmentioning

confidence: 99%

Phytosociological Survey of Weeds in Areas of Crop-Livestock Integration

Batista¹,

Giacomini²,

Gerdes³

et al. 2014

AJPS

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The dynamics of the weeds in the areas of crop-livestock integration is constantly changing depending on the various uses of the area. This study identified and quantified the floristic composition of weeds in areas of integration of maize for silage with Urochloa ruziziensis cv. Common at different densities of grass (0, 4 and 10 kg•ha −1 ) to grazing of beef cattle. The experimental design was completely randomized. A square of side 0.5 m (0.25 m 2 area) was launched 24 times in each study area. The survey was conducted at the grain filling stage of maize. The specie contained in each frame were identified and counted. The phytosociological survey identified 9 families of weeds in areas assessed, with 7 families in every area of integrated cultivation maize with Urochloa ruziziensis at densities of 10 kg•ha −1 and 4 kg•ha −1 and 8 families in the area of maize cultivated alone. The Asteraceae family was the most represented in number of species. Sida spp (Malvaceae) showed greater potential to cause damage to maize. Urochloa ruziziensis at planting density of 10 kg•ha −1 provided greater competition with weeds in the integration with maize.

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Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas de cultivo e corretivo de acidez

Cited by 9 publications

References 21 publications

Phytosociology of weed community in two vegetable growing systems

Phytosociology of weed community in two vegetable growing systems

Crescimento e nutrição mineral de Sida rhombifolia

Phytosociological Survey of Weeds in Areas of Crop-Livestock Integration

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