Growth habit effect on development of modern soybean cultivars after beginning of bloom in Rio Grande do Sul

Zanon, Alencar Júnior; Streck, Nereu Augusto; Rocha, Thiago Schmitz Marques da; Alberto, Cleber Maus; Bartz, Alex Cristiano; Paula, Gizelli Moiano de; Tomiozzo, Regina; Costa, Liege Camargo da; Fensterseifer, Cesar Augusto Jarutais; Tagliapietra, Eduardo Lago; Cardoso, Andréa; Weber, Patric Scolari; Bexaira, Kelin Pribs

doi:10.1590/1678-4499.535

Cited by 15 publications

(13 citation statements)

References 9 publications

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“…Há de se ressaltar que as novas cultivares de soja apresentam hábito de crescimento indeterminado e porte mais baixo, com menor tamanho de trifólios, os quais se encontram inseridos em ângulos mais agudos na haste (ZANON et al 2016). Características essas diferentes das primeiras linhagens introduzidas no Brasil, o que vem promovendo mudanças nos ajustes fitotécnicos de semeadura (arranjo de plantas), visto que a maioria dos materiais apresenta características de alta plasticidade (SOUZA et al 2010).…”

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Desempenho agronômico da soja cultivada em diferentes épocas e distribuição de plantas

Carmo

Braz

Simon

et al. 2015

Rev. Ciênc. Agrovet.

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RESUMOPeríodos favoráveis à semeadura bem como a disposição espacial em que plantas se encontram na área de cultivo são fatores que influenciam diretamente a produtividade da soja. A melhor equidistância entre plantas para determinada época de cultivo pode resultar em maior aproveitamento de água, luz e nutrientes. Nesse contexto, por duas safras agrícolas de verão contínuas, foram realizados experimentos de campo com o objetivo de avaliar o desempenho agronômico da soja semeada em diferentes épocas e distribuição espacial de plantas. O delineamento utilizado foi de blocos casualizados, em esquema de parcelas subdivididas, com quatro repetições. Nas parcelas, foram alocadas quatro épocas de semeadura equidistantes de 15 dias a partir de 3 de outubro (2014/15 e 2015/16) e nas subparcelas foram dispostos, aleatoriamente, os espaçamentos entre linhas de semeadura de 0,5 e 0,25 m (tradicional e adensado, respectivamente). Na colheita, avaliaram-se características morfológicas, componentes do rendimento e a produtividade de grãos. A época de semeadura influenciou as características morfológicas e componentes do rendimento da soja. O retardamento da época de semeadura proporcionou menores rendimentos de grãos. As cultivares de soja se comportaram de maneira distinta quanto à redução no espaçamento entre linhas. A BMX Desafio RR ® apresentou maior produtividade quando cultivada em espaçamento entre linhas de 0,25 m em relação ao tradicional (0,5 m). PALAVRAS-CHAVE:arranjo espacial de plantas, Glycine max, plasticidade fenotípica. ABSTRACTFavorable periods to sowing as well as the spatial arrangement in which plants are found in the growing area are factors that directly influence soybean yield. The best equidistance between plants for a certain growing period may result in greater use of water, light and nutrients by plants. In this context, in two summer's crops, two field trials were carried out in order to evaluate the agronomic performance of soybean grown at different sowing periods and spatial plant distribution. The experimental design was a randomized complete block design in subdivided plots with four replications. In the plots, four equidistant sowing periods of 15 days from October 3 (2014/15 and 2015/16) were allocated and in the subplots, we arranged, randomly, the traditional and narrow plant spacing (inter-row spacing of 0.5 m and 0.25 m, respectively). At harvest, morphological characteristics, yield components and grain yield were evaluated. The sowing time influenced the morphological characteristics and yield components of soybean. Delaying the sowing season provided lower grain yields. Soybean cultivars behave differently in relation to the reduction of sowing inter-row spacing. BMX Desafio RR ® presented higher yield when cultivated in 0.25 m inter-row spacing compared to traditional spacing (0.5 m).KEYWORDS: plant spatial arrangements, Glycine max, phenotypic plasticity. INTRODUÇÃOCultivares de soja, em sua maioria, apresentam características de alta plasticidade, ou seja, capacidade de se adaptar ...

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Desempenho agronômico da soja cultivada em diferentes épocas e distribuição de plantas

Carmo

Braz

Simon

et al. 2015

Rev. Ciênc. Agrovet.

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“…In the cultivar BRS 8180, the highest investment in fertilization provided a shorter overlap period, being the inverse for cultivar ST 797. According to Heatherly et al [15] and Zanon et al [5] in late or late sowing, the duration of the vegetative and reproductive phase overlapping period may change according to the meteorological conditions during the development cycle, causing variations in the growth habit of a cultivar. Thus, it is possible to infer that the results found in this work can be due to the late sowing season (December), which affected in the development cycle of the cultivars, indicating that, in these cultivars, there were more vegetative stages in relation to the other cultivars.…”

Section: Resultsmentioning

confidence: 99%

“…The same analogy can also be made for the cultivars that obtained the lowest heights. Thus, in addition to genetic expression and investment in fertilization, the duration of the vegetative stage determines the agronomic characteristics, such as number of nodes, inflorescence, number of branches and pods per plant [5].…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of Soybean Cultivars of Contrasting Cycles according to the Level of Investment in Fertilization

Borghi¹,

Simão²,

Resende³

et al. 2017

AJPS

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The objective of the present study was to characterize the duration of the phenological stages, the agronomic characteristics and grain yield in soybean cultivars with contrasting cycles and indeterminate growth type, submitted to different fertilization investment environments under no-tillage system in the central region of Minas Gerais. The work was conducted under field conditions, in an experimental area of Embrapa Maize and Sorghum, in Sete Lagoas, MG, in the harvest of 2015/2016. Ten soybean cultivars with different relative maturity groups (RMG) were studied, representing almost all RMG materials currently sown in Minas Gerais, in two environments with different levels of fertilizer investment. The variables were submitted to analysis of joint variance, in order to verify the existence of interaction between cultivars and investment in fertilization environments. Fertilizer investment levels influence grain yield of soybean cultivars of contrasting cycles. The higher height of the soybean plants implies higher lodging and lower grain yield. This situation is aggravated by the greater investment in fertilization. The difference between the cycles of the cultivars is in the duration of the vegetative stages, being greater in the later cultivars.

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“…According to Streck et al (2008), the plastochron of soybean plants is dependent on the cultivar. Moreover, the final number of nodes is dependent on the cultivars, sowing time, and photoperiod, and is related to the duration of the crop cycle of the cultivar (Setiyono et al, 2007;Zanon et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Weed incidence and sowing time affect soybean development

et al. 2018

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Despite the economic importance of the effects of weeds on the plastochron and emission of nodes of soybean plants, it has not been studied in detail. The aim of this study was to provide information about the effects of weeds on the development of soybean plants by determining the plastochron and number of nodes of soybean plants of different cultivars sown at different times in soils with presence and absence of weeds. A field study was conducted during the 2013/2014 crop season including a phytosociological survey to identify the occurring weeds, and the determination of the plastochron and final number of nodes of soybean plants. Four botanical families of weeds were found infesting the soybean crops. The plastochron and final number of nodes of soybean were influenced by the cultivar, sowing time, and presence of weeds. The plastochron was higher when the plants were grown in the presence weeds due to the higher relative frequency, relative density, relative abundance, and importance value index of the Euphorbia heterophyla, Ipomoea purpurea, and Urochloa plantaginea species, which resulted in a slower development of the soybean plants, and lower number of nodes per plant.

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Growth habit effect on development of modern soybean cultivars after beginning of bloom in Rio Grande do Sul

Abstract: ranged with the type of growth, maturity group, location, and sowing date.

Cited by 15 publications

References 9 publications

Desempenho agronômico da soja cultivada em diferentes épocas e distribuição de plantas

Desempenho agronômico da soja cultivada em diferentes épocas e distribuição de plantas

Evaluation of Soybean Cultivars of Contrasting Cycles according to the Level of Investment in Fertilization

Weed incidence and sowing time affect soybean development

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