Interactions between soybean and weeds in a replacement series system, considering the effects of water stress

Vivian, Rafael; Neto, Durval Dourado; Filho, Ricardo Victória; Silva, A.A.; Franco, Roberta Brancher; Corrêa, Simone Toni Ruiz

doi:10.1590/s0100-83582013000400001

Cited by 6 publications

(4 citation statements)

References 14 publications

(8 reference statements)

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“…The use of chemicals in weed control is common in intensive agricultural and forestry crops, which suffer significant losses in productivity because of interference caused by weeds that compete for essential resources such as water, light and nutrients or by possible allelopathic effects (Vivian et al, 2013;Hill et al, 2007). Drift in restoration areas induced by directed herbicide application is an important factor that negatively affects the ecological restoration of these areas.…”

Section: Introductionmentioning

confidence: 99%

Initial growth of tree species under herbicide drift

Monquero¹,

Bevilaqua²,

Silva³

et al. 2016

RCA

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ABSTRACT:The present study aimed to evaluate the effect of different doses of the herbicides picloram, glyphosate, glyphosate + 2.4-D, and 2.4-D on the survival and growth of the tree species Croton floribundus and Heliocarpus americanus and Myrsine coriacea. The experimental design was completely randomized with four replicates. The tree species were sprayed with 0; 2.5; 5; 10; 20; 40; 60; 75; 90 and 100% of the commercial dose of each herbicide. The percentage of phytotoxicity, chlorophyll content, height, stem diameter, leaf area and aerial dry biomass of the species were evaluated. For H. americanus, the herbicides glyphosate, 2.4-D and glyphosate + 2.4-D were phytotoxic. Among the evaluated herbicides, picloram was the most phytotoxic for all species. Glyphosate presented lower phytotoxicity at lower doses for M. coriacea compared with C. floribundus and H. americanus. A negative impact of 2.4-D was verified in all species, even at the lowest doses. The mixture glyphosate + 2.4-D also presented high phytotoxicity, with lower values for the species M. coriacea. The results showed that the application of these herbicides should be directed and protected, and even low dosages have deleterious effects on these species. 0; 2,5; 5; 10; 20; 40; 60; 75; 90 RESUMO: O objetivo deste trabalho foi avaliar o efeito de diferentes doses dos herbicidas picloram, glyphosate, glyphosate + 2,4-D e 2,4-D na sobrevivência e no crescimento das espécies arbóreas Croton floribundus, Heliocarpus americanus e Myrsine coriacea. O delineamento experimental foi inteiramente casualizado, com quatro repetições. As espécies arbóreas foram pulverizadas com

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Section: Introductionmentioning

confidence: 99%

Initial growth of tree species under herbicide drift

Monquero¹,

Bevilaqua²,

Silva³

et al. 2016

RCA

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“…Furthermore, soybean plants under this interference had higher values for physiological variables compared to those that coexisted with forage plants not treated with glyphosate (Table 1). The herbicide action on the forage favored the use of growth resources such as water, light, and nutrients by soybean plants (Vivian et al, 2013). According to Ferreira et al (2015), the physiological behavior of soybean under interference is related to the population density of the crop and competing plant, the period of coexistence, and the competitive potential of the infesting species.…”

Section: Resultsmentioning

confidence: 99%

“…More sensitive species compete less for water than more tolerant ones, which have a greater capacity to compete with the crop (Lima et al, 2016). Therefore, the adaptation capacity of the species to water deficit is determinant for the maintenance of the photosynthetic activity (Vivian et al, 2013). In competitive conditions, plants with an efficient stomatal control are more competitive under water deficit situations (Ferreira et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Coexistence of soybean plants and Urochloa spp. under glyphosate and water deficit effects

Silva¹,

Pereira²,

Sousa³

et al. 2019

Científica

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In the insertion of forage plants of the genus Urochloa P. Beauv. (Poaceae) coexisting with annual crops, proper management of the intercropping becomes necessary to avoid economic losses. Among management measures, the chemical inhibition of forage plants with herbicide subdoses is highlighted. Therefore, this study evaluates the morphophysiological responses of soybean (Glycine max (L.) Merr.) genetically modified to tolerate glyphosate (RR soybean), in coexistence with Urochloa spp., treated or not with glyphosate subdoses and subjected to water deficit. Two tests were carried out in pots with forage species Urochloa ruziziensis (R.Germ & Evrard) Crins and Urochloa brizantha (Hochst. Ex A. Rich.) R. D. Webster cv. Marandu coexisting with soybean, in randomized blocks with five replicates. The tests were arranged in a 2x2x2 factorial arrangement: the first factor was represented by the absence and presence of forage; the second by the absence and use of glyphosate subdoses; and the third factor by 50% and 100% field capacity in the pots. The use of glyphosate suppressed the competitive capacity of forages, benefiting the soybean in coexistence. In the absence of suppression from glyphosate, the competition exerted by the forage promoted lower values for the physiological and morphological variables of soybean plants. Among the forages,U. ruziziensis was the most competitive with soybean plants. The root system of forages was not affected by water deficit, only the physiological and morphological characteristics of soybean, mainly rootdry mass. Glyphosate affected forage growth.

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“…The complexity of factors that define the competition among plants has been studied by several investigators, aiming to define the mutual development capacity and species adaptation to the most different environments (Carvalho & Christoffoleti, 2008;Silva et al, 2009;Dias, Pinto, Mondo, Cicero, & Pedrini, 2011;Vivian et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

<b>Mycorrhizal association in soybean and weeds in competition

et al. 2016

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ABSTRACT. The purpose of this study was to evaluate the effects of mycorrhizal association on the interference of Bidens pilosa, Urochloa decumbens and Eleusine indica on soybean culture in two conditions: a) plants competing without contact with roots of another species; b) with contact between roots. At 60 days after planting, growth, nutrient accumulation and mycorrhizal colonization of soybean and weeds were evaluated. The contact between roots of soybean plant and weed species increased the negative interference effects for both species, with less growth and nutrient accumulation. With the individualization of roots, higher competition occurred for soil resources up to 60 days of coexistence between species. In competition with soybean, Bidens pilosa and Urochloa decumbens stood out in accumulation of most nutrients without differing from when cultivated in monocultivation. The increase of the soybean mycorrhizal colonization was 53, 40 and 33% when in competition with Urochloa decumbens, Eleusine indica and Bidens pilosa species, respectively. A positive interaction occurred for soybean mycorrhizal colonization and competing plants irrespective of weed species or root contact. Keywords: Bidens pilosa, Urochloa decumbens (Syn. Urochloa decumbens), Eleusine indica, arbuscular mycorrhiza fungi.Associação micorrízica em soja e plantas daninhas em competição RESUMO. Objetivou-se neste trabalho avaliar os efeitos da associação micorrízica na interferência de Bidens pilosa, Urochloa decumbens e Eleusine indica sobre a cultura da soja em duas condições: a) plantas competindo sem contato entre raízes de outra espécie b) com contato entre raízes. Aos 60 dias após o plantio, foram feitas avaliações do crescimento, acúmulo de nutrientes e colonização micorrízica da soja e plantas daninhas. O contato entre as raízes de plantas de soja e das espécies daninhas aumentou os efeitos negativos da interferência para ambas às espécies, com menor crescimento e acúmulo de nutrientes. Com a individualização das raízes, maior competição estabeleceu-se pelos recursos do solo até os 60 dias de convivência entre cultura e espécie competidoras. Em competição com a soja, B. pilosa e U. decumbens destacaram-se no acúmulo da maioria dos nutrientes não diferindo de quando cultivadas em monocultivo. O aumento da colonização micorrízica da soja foi de 53, 40 e 33 % quando em competição com U. decumbens, E. indica e B. pilosa, respectivamente. Ocorreu interação positiva para a colonização micorrízica da soja e das plantas competidoras independente da espécie daninha e do contato entre as raízes. Palavras-chave:Bidens pilosa, Urochloa decumbens, Eleusine indica, fungo micorrízico arbuscular.

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Interactions between soybean and weeds in a replacement series system, considering the effects of water stress

Cited by 6 publications

References 14 publications

Initial growth of tree species under herbicide drift

Initial growth of tree species under herbicide drift

Coexistence of soybean plants and Urochloa spp. under glyphosate and water deficit effects

<b>Mycorrhizal association in soybean and weeds in competition

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