Períodos de interferência das plantas daninhas na cultura do girassol em Rondônia

Alves, Gibran da Silva; Tartaglia, Francilene de Lima; Rosa, Jhonatas Cortes; Lima, Pamela Carvalho de; Cardoso, G. D.; Beltrão, N. E. de M.

doi:10.1590/s1415-43662013000300005

Cited by 11 publications

(16 citation statements)

References 11 publications

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“…Consequently, weeds that infest the area after this period do no cause any significant damage to the crop (Silva et al, 2013). The above corroborates reports by Alves et al (2013) who registered that PPAI was 37 and 43 DAE respectively for genotypes Embrapa 122 and Helio 358.…”

Section: Resultssupporting

confidence: 89%

“…Although the sunflower may be intercropped with grass species, negative effects (with loss of productivity) may occur due to greater interspecies competition (Alves et al, 2013). Gontijo Neto et al (2009) assessed sunflower intercropping with Xaraés, Piatã and Massai cultivars and reported a 27% decrease in sunflower productivity when compared to sunflower crop alone.…”

Section: Introductionmentioning

confidence: 99%

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Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Kimecz¹,

Silva²,

Machado³

et al. 2018

Científica

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Kimecz¹,

Silva²,

Machado³

et al. 2018

Científica

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“…This interaction is known as competition (SILVA et al, 2013). Under field conditions, competition with weeds can reduce sunflower yields by up to 70% (ALVES et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effects of Competition and Water Deficiency on Sunflower and Weed Growth

et al. 2019

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In the agricultural environment, the occurrence of biotic and abiotic stresses, such as weed interference and soil water deficit is common. However, little is known about the effects of the interaction of these stresses on the growth of cultivated crops and weed species. Thus, the objective of this study was to evaluate the effects of competition and water deficiency on the growth of sunflowers and weeds. The experiment was performed in a randomized block design with four replications. The treatments were arranged in a 5 × 2 factorial design, with the first factor corresponding to the competition arrangements between the species (sunflower + Waltheria indica; sunflower + Amaranthus spinosus; and sunflower, W. indica, and A. spinosus in monoculture without competition) and the second factor corresponding to water regimes (irrigated and water deficit). The water deficit regime was established when the sunflower plants had six expanded leaves (V6 stage) and was maintained until the rate of CO2 assimilation of the plants reached values close to zero (6 days), after which irrigation was resumed and maintained until 40 days after emergence, when the plants were collected and evaluated. The growth components evaluated were plant height, leaf area, dry leaf mass, dry stem mass, dry root mass, and total dry mass. Competition between plants decreased sunflower, W. indica, and A. spinosus growth. W. indica and A. spinosus aggravated the negative effects of water deficiency on sunflower growth. The water deficit regime did not affect the growth of W. indica. A. spinosus was more competitive with the sunflower than was W. indica.

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“…The competition in an environment can be intraspecific and interspecific. The interspecific competition is important for phytosanitary management, since it causes yield loss and hinders cultural practices and increases incidence of pests (ALVES et al, 2013). Moraes et al (2009) evaluated the interspecific competition between soybean crops and Oryza sativa, and found superior competitive ability for the soybean, with higher relative productivity of leaf area (LA) and shoot dry weight (SDW).…”

Section: Introductionmentioning

confidence: 99%

Relative Competitiveness of Goosegrass Biotypes and Soybean Crops

et al. 2017

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-The goosegrass (Eleusine indica (L.) Gaertn) is an annual plant that has a low-level resistance to glyphosate (LLRG), resulting in control failure in genetically modified soybean crops for resistance to this herbicide. Alleles related to resistance may cause changes in the plant biotype, such as inferior competitive ability. Thus, the objective of this work was to evaluated the competitive ability of soybean crops and susceptible and resistant (LLRG) goosegrass biotypes. Replacement series experiments were conducted with soybean crops and goosegrass biotypes. The ratios of soybean to susceptible or resistant (LLRG) goosegrass plants were 100:0, 75:25, 50:50, 25:75 and 0:100, with a total population of 481 plants m -2 . The leaf area, plant height and shoot dry weight were evaluated at 40 days after emergence of the soybean crops and weeds. The soybean crop had superior competitive ability to the susceptible and resistant (LLRG) goosegrass biotypes. The soybean crop showed similar competitive ability in both competitions, either with the susceptible or resistant (LLRG) goosegrass biotypes. The intraspecific competition was more harmful to the soybean crop, while the interspecific competition caused greater damage to the goosegrass biotypes competing with the soybean crop.Keywords: Glycine max. Eleusine indica. Competition. Resistance. COMPETITIVIDADE RELATIVA DE BIÓTIPOS DE CAPIM PÉ-DE-GALINHA COM A CULTURADA SOJA RESUMO -O capim pé-de-galinha (Eleusine indica (L.) Gaertn) é uma planta anual, que apresenta resistência de nível baixo (RNB) ao herbicida glifosato o que acarreta em falhas de controle em lavouras de soja geneticamente modificadas para resistência ao herbicida. Os alelos relacionados com a resistência podem acarretar em custos de adaptação ao biótipo, conferindo menor habilidade competitiva. Diante disso, o objetivo da pesquisa foi comparar a habilidade competitiva da cultura da soja com os biótipos de capim pé-de-galinha suscetível ou com RNB. Para isso, foram conduzidos experimentos em série de substituição entre a cultura da soja e os biótipos de capim pé-de-galinha. As proporções entre plantas de soja e capim pé-de-galinha suscetível ou com RNB foram de 100:0, 75:25, 50:50, 25:75 e 0:100, com população total de 481 plantas m -2 . Avaliaram-se a área foliar (AF), estatura de planta (EST) e a massa da matéria seca da parte aérea (MMSPA), aos 40 DAE da cultura da soja e da planta daninha. A cultura da soja tem habilidade competitiva superior aos biótipos de capim pé-de-galinha suscetível ou com RNB. A habilidade competitiva da soja não foi diferencial frente à competição com os biótipos de capim pé-de-galinha suscetível ou com RNB. A competição intraespecífica para a cultura da soja e a competição interespecífica para os biótipos de capim pé-de-galinha, causam maiores danos aos competidores.Palavras-chave: Glycine max. Eleusine indica. Competição. Resistência.

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Períodos de interferência das plantas daninhas na cultura do girassol em Rondônia

Cited by 11 publications

References 11 publications

Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Effects of Competition and Water Deficiency on Sunflower and Weed Growth

Relative Competitiveness of Goosegrass Biotypes and Soybean Crops

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