Resposta De Cultivares De Soja À Competição Com Cultivar Simuladora Da Infestação De Plantas Concorrentes

Fleck, Nilson Gilberto; Lamego, Fabiane Pinto; Schaedler, Carlos Eduardo; Ferreira, Fausto Borges

doi:10.5380/rsa.v8i3.9520

Cited by 16 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1), which represents the impact on yield of the addition of a hairy fleabane plant. These results corroborate with FLECK et al (2007) that the soybean yield losses of due to the competition with plants that have the same niche cause greater impact on the early cultivar compared to longer cycle cultivars.…”

Section: Resultssupporting

confidence: 88%

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

2018

View full text Add to dashboard Cite

The interference of glyphosate resistant hairy fleabane (Conyza bonariensis) has caused yield losses in soybean crop. Knowledge of the economic threshold is an important aspect for the economic management of resistant weeds. Because of it, the interference of the glyphosate resistant hairy fleabane density on the soybean yield loss was evaluated, as well as to estimate the economic threshold. Two experiments were conducted to verify the effect of different weed densities on the yield of two soybean cultivars (BRS Estância and BMX Turbo). Weed density ranged from 0 to 124 plants m-2. The yield of the BRS Estância decreased by 1.4% to the increase of one single plant, while for the BMX Turbo the loss was 25.9%. Soybean yield and economic threshold were lower for the BMX Turbo cultivar compared to the cultivar BRS Estância, which can be attributed to the genotype, competitive ability, weed development stage and/or environment. Increases in crop yield expectation, soybean price and herbicide efficiency reduce the economic threshold, indicating that the adoption of control measures should be taken when the weed density is low. Due to the high cost of hairy fleabane control, it is only feasible at high densities.

show abstract

Section: Resultssupporting

confidence: 88%

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

2018

View full text Add to dashboard Cite

show abstract

“…A exemplo da soja, a competição intraespecífica é mais importante do que a competição interespecífica. Plantas detentoras de características como estatura elevada e elevado índice de área foliar, identificam culturas com elevado potencial competitivo com plantas daninhas (Fleck et al, 2007). Em soja, destacam-se características de planta como estatura e comprimento de ramos, por conferir à cultura maior competição com plantas daninhas (Bianchi et al, 2006 …”

Section: Resultsunclassified

COMPETITIVIDADE RELATIVA DA SOJA EM CONVIVÊNCIA COM PAPUÃ (Brachiaria plantaginea)

Agostinetto¹,

Rigoli²,

Galon³

et al. 2009

RSA

View full text Add to dashboard Cite

RESUMOA habilidade de uma planta para competir com outra se relaciona a fatores como espécie, população, época de emergência e características morfofisiológicas. Os experimentos em série substitutiva possibilitam estudar os efeitos da população e da proporção de plantas em associações de espécies, a importância da competição intra e interespecífica e a diferenciação de nicho ecológico. O objetivo do trabalho foi investigar a habilidade competitiva de plantas de soja com a planta daninha papuã pelo método experimental de série substitutiva. O experimento foi conduzido com população total de 200 plantas m -2 e proporções de 100:0, 75:25, 50:50, 25:75 e 0:100 para soja e papuã, respectivamente, em delineamento completamente casualizado, com quatro repetições. A análise da competitividade foi efetuada por meio de diagramas aplicados a experimentos substitutivos e variáveis morfológicas. Os desvios observados nas retas de produtividade relativa e produtividade relativa total, em relação às retas esperadas, para ambas as espécies, resultaram em linhas côncavas e inferiores a um, demonstrando antagonismo no crescimento das espécies em associação. Para soja e papuã, a competição intraespecífica foi mais importante do que a competição interespecífica.Palavras-chave: Glycine max; interferência; planta daninha; variáveis relativas. ABSTRACTThe ability of a certain plant to compete with another one is related to factors such as species, population, emergence period and morphophysiologic characteristics. Experiments in substitution series allow the study of population effects and proportion of plants in species association, the importance of intra and interspecific competition and the ecological niche differentiation. The objective of this study was to investigate the competitive ability of soybean plants with the weed plant alexandergrass through the experimental method of substitution series. The experiment was carried out with a total population of 200 plants m -2 and proportions of 100:0, 75:25, 50:50 and 0:100 for soybean and alexandergrass, respectively, in a completely randomized design, with four replications. Competitive analysis was performed through diagrams applied to substitutive experiments and morphologic variables. Deviations observed in relative productivity lines and total relative production, in relation to expected linear lines, for both species, resulted in concave lines and smaller than 1, demonstrating antagonism in the growth of species in association. For soybean and alexandergrass, intraspecific competition was more important than interspecific competition.

show abstract

“…A study conducted by Fleck et al (2007) indicates that the growth rate of a soybean plant is the key factor that reduces the interference generated by other plants. Moreover, the authors explain that the plant height and the ability to branch can determine the competitiveness of the soybean.…”

Section: Cultivo Integrado De Cultivares De Soja E Braquiáriamentioning

confidence: 99%

Intercropping of soybean cultivars with Urochloa

Franchini

Antonio

Junior

et al. 2014

Pesqui. Agropecu. Trop.

View full text Add to dashboard Cite

The integrated crop-livestock system is a key strategy for both grain and livestock production. The cultivation of grass species in between two soybean cropping seasons has been an important component of this system, in Brazil. Thus, this study aimed to evaluate the yield of glyphosate-resistant soybean cultivars intercropped with Urochloa species, under different forage management systems. A total of six experiments, consisting of three soybean cultivars (BRS 295 RR, BRS 316 RR, and BRS 294 RR) and two grass species (Urochloa ruziziensis and Urochloa brizantha), were established. For each experiment, four treatments (soybean only; grass only; soybean intercropped with a grass species, with the application of glyphosate to decrease the growth of grass; and soybean intercropped with a grass species, without growth suppression) were evaluated in a completely randomized experimental design, with four replications. For each experiment, only one soybean cultivar and one grass species were used. The grasses were sown in the soybean inter-rows at 27 days after sowing (DAS), while the glyphosate application to the treatment with grass suppression was performed at 84 DAS for the soybean or 57 DAS for the grasses. The yields of the three soybean cultivars were not significantly affected by either grass species, even though the shoot dry-matter yields for both of the intercropped grass species were high, though lower than the values obtained without the interference imposed by soybean.

show abstract

Resposta De Cultivares De Soja À Competição Com Cultivar Simuladora Da Infestação De Plantas Concorrentes

Cited by 16 publications

References 8 publications

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

COMPETITIVIDADE RELATIVA DA SOJA EM CONVIVÊNCIA COM PAPUÃ (Brachiaria plantaginea)

Intercropping of soybean cultivars with Urochloa

Contact Info

Product

Resources

About