Períodos de interferência de plantas daninhas na cultura do girassol

Brighenti, A. M.; Castro, C. de; Oliveira, Rubem Silvério de; Scapim, Carlos Alberto; Voll, E.; Gazziero, D. L. P.

doi:10.1590/brag.2013.040

Cited by 11 publications

(11 citation statements)

References 15 publications

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“…It should be underscored that total prevention period against interference (PPAI), or rather, the period in which the crop should be maintained free of weeds, is approximately 39 DAE in the summer and 34 DAE in the winter. 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%

“…Regard to competition with other species, the sunflower crop is efficient 30 days after emergence. According to Silva et al (2013), the plant exerts crop control and overshadows the other species. However, since in current analysis seedlings of U. ruziziensis started to emerge only 8 DAS, or rather, 3 DAE of sunflower seedlings, a low scale interspecies competition ensued, with low negative effects on the sunflower development.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Kimecz¹,

Silva²,

Machado³

et al. 2018

Científica

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Kimecz¹,

Silva²,

Machado³

et al. 2018

Científica

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“…Em geral, no agronegócio brasileiro, o milho é largamente cultivado e a produtividade média para grãos é em torno de 5,41 t ha -1 (CONAB, 2017); já a produtividade de silagem varia de 8 a 23 t ha -1 de matéria seca (Von Pinho et al, 2007). Silva et al (2013) relatam que toda a produtividade, tanto de grãos como de silagem, pode ser reduzida ou depreciada em função da presença de plantas invasoras, que acarretam perdas diretas ou indiretas de rendimento (Bachega et al, 2013). Para Santos et al (2010), essas plantas invasoras, também conhecidas como plantas daninhas, interferem no desenvolvimento e crescimento dos cultivos (Carvalho et al, 2010), principalmente pela competição interespecífica por água, luz e nutrientes (Swanton & Weise, 1991).…”

Section: O Milho é Uma Planta Originária Da Américaunclassified

Controle De Plantas Daninhas Em Função De Diferentes Espaçamentos No Milho Silagem

Silva¹,

Aparecido²,

Lopes³

et al. 2017

RBMS

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RESUMO -O objetivo deste trabalho foi avaliar o controle de plantas daninhas no cultivo do milho silagem em diferentes espaçamentos entre linhas. Ele foi desenvolvido em Muzambinho-MG (Brasil), no ano agrícola de 2010/2011. Empregou-se o delineamento experimental em blocos casualizados e esquema fatorial 3x4, sendo utilizados três espaçamentos entre linhas (0,50 m; 0,75 m; 1,00 m) e quatro métodos de controle das plantas daninhas (testemunha "capina"; herbicida aplicado em pré-emergência das plantas daninhas; herbicida aplicado em pós-emergência das plantas daninhas; e herbicidas aplicados em pré-emergência e pós-emergência das plantas daninhas), com três repetições, totalizando 36 parcelas experimentais. Nas avaliações, além dos parâmetros fitotécnicos, como altura de plantas e espiga, diâmetros de colmo, produtividade, estande final, também foram avaliados paramentos físicos, químicos e biológicos da silagem, como a umidade a 65 °C e 105 °C, fibra bruta, proteína bruta, matéria mineral, extrato etéreo e fibra em detergente ácido e neutro. Houve interação significativa entre os manejos de plantas daninhas e os espaçamentos entre linhas, para as variáveis: estande final, produtividade, umidade a 65 °C, fibra bruta, e fibra em detergente ácido. A mudança no espaçamento entre linhas e na densidade de plantio afeta diretamente o manejo de plantas daninhas no cultivo de milho para silagem.Palavras-chave: herbicidas, controle químico, Zea mays, biplot. WEED CONTROL IN MAIZE SILAGE IN DIFFERENT SPACINGSABSTRACT -This study aimed to evaluate the corn silage weed control in different row spacings. The work was developed in Muzambinho, State of Minas Gerais (Brazil), in the agricultural year 2010/2011. The experimental design was carried out with randomized block (RBD) in 3x4 factorial scheme with three row spacings (0.50 m, 0.75 m and 1.00 m) and four methods of weed control (witness "hoeing"; herbicide pre-emergent; herbicide-post emergent; and herbicide pre-emergent and post-emergent), and three replications. Plant height and ear insertion, stem diameter, yield and final stand, silage physical, chemical and biological parameters, such as humidity at 65 °C and 105 °C, raw fiber, raw protein, ash, ether extract and fiber in acid and neutral detergent, were evaluated. The interaction between weed management systems and spacings was significant for stand, yield, humidity at 65 °C, raw fiber, ether extract and acid detergent fiber. The change in line spacing and planting density directly affects weed management in silage corn cultivation.

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“…Weeds can also act as agents causing abiotic stresses related to the unavailability of essential growth resources, such as water, light, and nutrients. 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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Períodos de interferência de plantas daninhas na cultura do girassol

Cited by 11 publications

References 15 publications

Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Agronomic performance of sunflower intercropped with Urochloa ruziziensis

Controle De Plantas Daninhas Em Função De Diferentes Espaçamentos No Milho Silagem

Effects of Competition and Water Deficiency on Sunflower and Weed Growth

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