Interação entre volume de vaso e competição com plantas daninhas sobre o crescimento da soja

Almeida, Mirielle Oliveira; Matos, Christiano da Conceição de; Silva, Daniel Valadão; Braga, Renan Rodrigues; Ferreira, Evander Alves; Santos, José Barbosa dos

doi:10.1590/0034-737x201562060003

Cited by 7 publications

(7 citation statements)

References 13 publications

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“…For DRM (Figure 2E), a reduction was observed when in competition with W. indica under irrigated conditions. Similar to the present study, Almeida et al (2015) found a smaller increment in DRM accumulation when the soybean competed with Urochloa brizantha and Bidens pilosa. It was verified that the competition from A. spinosus intensified the effects of the water restriction, with an even more severe reduction in DRM for the sunflower plants.…”

Section: Effects Of Competition and Water Deficiency On Sunflower Growthsupporting

confidence: 91%

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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Section: Effects Of Competition and Water Deficiency On Sunflower Growthsupporting

confidence: 91%

Effects of Competition and Water Deficiency on Sunflower and Weed Growth

et al. 2019

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“…A presença de plantas infestantes resultou num decréscimo de 33% da produtividade. A soja em convivência com as plantas daninhas tem seu crescimento e desenvolvimento modificados pela interferência na captação dos recursos ambientais (ALMEIDA et al, 2015). Plantas de soja sob competição tendem a apresentar alterações morfofisiológicas, com reflexo na produtividade (VOLLMANN et al, 2010).…”

Section: Resultsunclassified

Desempenho agronômico de soja, sob interferência de plantas infestantes

Souza

Cardoso

Mamede

et al. 2019

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A competição entre os recursos ambientais, imposta pela comunidade infestante, afeta o crescimento, produtividade e qualidade final da soja, prejudicando a colheita, por competição, que aumenta o custo operacional. Outro fator relevante da interferência das plantas infestantes é que estas podem ser hospedeiras de patógenos e pragas, o que dificulta seu controle. Este trabalho teve como objetivo avaliar o desempenho agronômico de duas cultivares de soja sujeitas à interferência de plantas infestantes. O experimento foi conduzido na área experimental da Fazenda Capim Branco pertencente à Universidade Federal de Uberlândia, no município de Uberlândia - MG, na safra 2015/2016. O delineamento experimental foi o de blocos ao acaso (DBC) com seis repetições. Foram utilizadas duas cultivares, uma de ciclo precoce (UFUS Capim Branco) e outra de ciclo tardio (UFUS Carajás), avaliadas na presença e ausência de plantas infestante, quanto à altura da planta na maturidade, número de nós na haste principal, número de vagens e produtividade de grãos. Após atender às pressuposições do modelo, os dados foram submetidos à análise de variância e ao teste de Tukey (p<0,05). Os resultados refletiram as relações de interferência entre a população de infestantes e a cultura, sendo a família Poaceae a infestante predominante no experimento. Houve aumento na altura média das plantas de soja, redução do número de nós e da produtividade de grãos em ambas cultivares. A cultivar UFUs Capim Branco, sob interferência de infestantes, obteve maior rendimento quando comparada a cultivar de ciclo tardio, UFUS Carajás.

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“…Chlorogenic acid, ferulic acid, catechin and p-anisic acid, all phenolic compounds, are reported as having a significant effect on the plant root system, acting on membrane stability and lignin synthesis with growth impairment of this plant organ on weeds (Carvalho et al, 2014;Cecchin et al, 2017). These results are important indicators of the allelopathic potential of cover crops, since sharp root reduction can affect the competitive capacity and the negative effect of the weed on the agricultural crop (Almeida et al, 2015). Cover crops promoted a suppressive effect on germination of the shrubby false buttonweed seeds (Table 3), especially by Cajanus cajan, Urochloa brizanha cv.…”

Section: Resultsmentioning

confidence: 99%

“…Weeds compete for different resources with agricultural crops, and the management of these plants is necessary to minimize production losses (Castro et al, 2001;Almeida et al, 2015). In the management of these plants, chemical method predominates by applying herbicides.…”

Section: Introductionmentioning

confidence: 99%

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

2018

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potential of cover crops in control of shrubby false buttonweed ... ABSTRACT -Searching for alternatives to deal with weeds without the exclusive use of herbicides can increase the sustainability of agricultural production in the Amazon region. This study aimed to evaluate the allelopathic potential of cover crops on the weed shrubby false buttonweed (Spermacoce verticillata L.). Three straw levels (1; 2.5 and 5 mg cm -2 ) of thirteen cover crops (Cajanus cajan, Canavalia ensiformis, Crotalaria juncea, C. ochroleuca, C. spectabilis, Mucuna aterrima, M. cinereum, Pennisetum glaucum, Sorghum bicolor, S. sudanense, Urochloa brizanha cv. Xaraés, U. brizantha cv. Piatã and U. ruziziensis) were assessed on germination and initial growth of weed and lettuce. We carried out two experiments (weed and lettuce) in a factorial scheme (cover crops x straw levels) with additional treatment (control without straw) in a completely randomized experimental design, with four replicates. The straw of the cover crops inhibited the germination and initial growth of the target plants. The highest straw levels promoted 44.0 and 78.8% reductions in radicle length in relation to the lowest dose (1 mg cm -2 ), for lettuce and Spermacoce verticillata, respectively. The highest sensitivity to allelochemicals occurred on the radicle. The major suppressive effects on weed germination were promoted by Cajanus cajan, Urochloa brizanha cv. Xaraés, Mucuna cinereum, M. aterrima, Canavalia ensiformis, Crotalaria juncea, C. spectabilis and U. ruziziensis. Cover crops use is an integrated practice management to control Spermacoce verticillata under no-tillage system.RESUMO -A busca por alternativas no manejo de plantas daninhas sem a utilização exclusiva de herbicidas pode contribuir para aumento da sustentabilidade na produção agrícola na região Amazônica. Objetivou-se neste estudo avaliar o potencial alelopático de plantas de cobertura, sobre a planta daninha vassourinhade-botão (Spermacoce verticillata L.). Três níveis de palhada (1; 2,5 e 5 mg cm -2 ) de treze plantas de cobertura (Cajanus cajan, Canavalia ensiformis, Crotalaria juncea, C. ochroleuca, C. spectabilis, Mucuna aterrima, M. cinereum, Pennisetum glaucum, Sorghum bicolor, S. sudanense, Urochloa brizanha cv. Xaraés, U. brizantha cv. Piatã e U. ruziziensis) foram avaliados, sobre a germinação e o crescimento inicial da planta daninha e da alface. Dois experimentos foram instalados (planta daninha e alface) em esquema fatorial (plantas de cobertura x níveis de palhada) com tratamento adicional (testemunha sem palhada) em delineamento experimental inteiramente casualizado, com quatro repetições. As palhadas das plantas de cobertura inibiram a germinação e o crescimento inicial potential of cover crops in control of shrubby false buttonweed ... 2 das plantas alvo. Os maiores níveis de palhada promoveram reduções de 44,0 e 78,8% no comprimento da radícula em relação à menor dose (1 mg cm -2 ), para a alface e para a vassourinha-de-botão, respectivamente. A maior sensibilidade aos aleloq...

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Interação entre volume de vaso e competição com plantas daninhas sobre o crescimento da soja

Cited by 7 publications

References 13 publications

Effects of Competition and Water Deficiency on Sunflower and Weed Growth

Effects of Competition and Water Deficiency on Sunflower and Weed Growth

Desempenho agronômico de soja, sob interferência de plantas infestantes

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

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