Emergência e crescimento inicial de cultivares de Urochloa em diferentes profundidades de semeadura

Ikeda, F. S.; Filho, Ricardo Victória; Vilela, Laíze Aparecida Ferreira; Marchi, Giuliano; Cavalieri, S.D.; Silva, Antônio Alberto da

doi:10.1590/s0100-83582013000100008

Cited by 17 publications

(19 citation statements)

References 10 publications

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“…Mean seedling emergence was within the range of 56%–80% reported by Ikeda et al. (), Laura, Rodrigues, Arias, Chermouth, and Rossi () and Vieira, Nagano, Bianchi, and Silva (). Seedling emergence of 74% is considered high, especially in areas that have a high density of U. decumbens such as abandoned pastures, where the seed density may reach 8,600 seeds/m 2 (Pancera, ).…”

Section: Discussionsupporting

confidence: 75%

“…The density may be higher, as Ikeda et al. () reported that seedling emergence may occur to a depth of 9 cm. However, based on the model presented by Bond, Honig, and Maze (), the maximum depth for seedling emergence for this species (mean seed mass = 5.2 ± 0.2 mg, data not shown) would be 4.7 ± 0.1 cm, suggesting that emergence from deeper levels only occurs in conditions where the soil is turned over.…”

Section: Discussionmentioning

confidence: 98%

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Seed longevity and seedling emergence rate of Urochloa decumbens as influenced by sowing depth in a Cerrado soil

Dantas-Junior

Musso

Miranda

2018

Grass and Forage Science

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Urochloa decumbens (Signal grass) is an African grass species that is widely used in Brazil for pasture formation, and it has a high potential for invading natural areas. This study evaluated the longevity of U. decumbens seeds in the soil seed bank and the emergence rates of seedlings from different depths. In the greenhouse (natural light; ~25°C), seeds were sown at depths of 0, 1, 2 or 3 cm, in trays filled with sterile soil, to assess seedling emergence. Seeds sowed on the soil surface began to germinate 3 days after sowing. Seeds sowed at depths of 2 and 3 cm germinated 5 days after sowing. No seedlings emerged after 15 days. The seedling emergence rate was 74 ± 7% with no significant difference between sowing depths. In the field, seed longevity was evaluated by burying 60 replicates of 100 seeds at a soil depth of 2–3 cm, in a Cerrado area in the IBGE Ecological Reserve, Brasília. From September 2016 to April 2017, five samples were retrieved monthly to assess seed viability. In September, the viability was 68%, declining to 3% in October; by February, viable seeds were no longer recorded. As U. decumbens flowers in several episodes throughout the year, a soil survey may result in a misleading interpretation of the formation of a permanent soil seed bank.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 98%

Seed longevity and seedling emergence rate of Urochloa decumbens as influenced by sowing depth in a Cerrado soil

Dantas-Junior

Musso

Miranda

2018

Grass and Forage Science

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“…decumbens emergence was affected by seeds location at the soil profile, therewith has occurred high intensity emergence reduction from 7.0 cm depth. Araldi et al (2013) and Ikeda et al (2013), also observed that sowing depth (B. decumbens) from 0.0 to 6.0 cm obtained the highest SEI.…”

Section: Resultsmentioning

confidence: 76%

Emergency Brachiaria Decumbens a Function of Depth of Seeds in Soil Profile

Silva¹,

Pitelli²,

Cruz³

et al. 2014

Nucleus Animal.

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SUMMARY:The grass B. decumbens is the most cultivated pasture establishment in Brazil pastures and on areas used for other crops is amongst the more undesired weeds, due to hard control and rusticity. Therefore, the aim of this study was to determine the effects of sowing depths on B. decumbens emergence. The tests were performed on green house using the following sowing depths (0.0, 0.5, 1.0, 1.5, 2.0, 2. 5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 e 10.0 cm). From 7.0 cm deep occurred significant emergence speed index (SEI) and seedlings emergence percentage (%ESI) reduction. In assessing the ability of germination of B. decumbens occurred suppression effect of germination in greater depth evaluated, while the other depths were tested emergency plan, with lower occurrence between 5 and 7 cm and topsoil. Layers between 0.5 and 2.5 cm larger plants des emergency occurred.Keywords: Soil Seed Ban. Vigor. Weed. EMERGÊNCIA DE BRACHIARIA DECUMBENS EM FUNÇÃO DA PROFUNDIDADE DE SEMENTES NO PERFIL DO SOLORESUMO: A gramínea B. decumbens é a mais cultivada em formação de pastagens no Brasil, em áreas onde são utilizadas para outros cultivos torna-se uma das plantas daninhas mais indesejadas, devido o seu difícil controle e rusticidade. Assim, o objetivo deste estudo foi determinar a emergência das plântulas de B. decumbens em profundidades de semeadura. Os ensaios foram realizados em casa de vegetação com as seguintes profundidades de semeadura (0,0; 0,5; 1,0; 1,5; 2,0; 2,5; 3,0; 4,0; 5,0; 6,0; 7,0; 8,0; 9,0 e 10,0 cm). A partir de 7,0 cm de profundidade ocorreu redução significativa no índice de velocidade de emergência (IVE) e na porcentagem de emergência das plântulas (%ESI) de B. decumbens. Na avaliação da habilidade de germinação da B. decumbens ocorreu efeito de supressão da germinação na maior profundidade avaliada, enquanto que, as demais profundidades testadas ocorreram emergência da planta, com menor ocorrencia entre 5 e 7 cm e na camada superficial do solo. Nas camadas entre 0,5 e 2,5 cm ocorreu maior emergência des plantas.Palavras -chave: Banco de sementes em solo. Vigor. Planta daninha.

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“…Esse resultado corrobora com os constatados por Aisenberg et al (2014), para a cultura da soja, por Sousa et al (2007), com moringa (Moringa oleifera Lam) e por Ikeda et al (2013), com cultivares de Urochloa spp., em que diminuiu drasticamente com o aumento da profundidade de semeadura.…”

Section: Causasunclassified

“…Ikeda et al (2013), trabalhando com cultivares do gênero Urochloa spp., constataram aumento da altura de plântula até 6 cm de profundidade, havendo drástica redução com o aumento da profundidade de semeadura. A redução na altura de plântula constatada no presente trabalho é atribuída ao aumento da barreira física proporcionado pelas camadas mais profundas do solo.…”

Section: Causasunclassified

Emergência e desenvolvimento inicial de plântulas de feijão em diferentes profundidades de semeadura

Biezus

Xavier

Brusamarello

et al. 2017

Agraria

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RESUMOA produtividade do feijão no Brasil é baixa, mesmo com a existência de cultivares melhoradas com elevado potencial produtivo. Entre os fatores que afetam a produtividade destaca-se a inadequada profundidade de semeadura que proporciona má germinação e emergência, afetando negativamente o estande inicial e final de plantas na lavoura. O presente trabalho objetivou avaliar os efeitos de diferentes profundidades de semeadura sobre a emergência e o desenvolvimento inicial de cultivares de feijão de quatro grupos comerciais. Empregou-se o esquema fatorial 5x4, no delineamento experimental inteiramente casualizado com quatro repetições, sendo 5 profundidades de semeadura (1, 2, 4, 6 e 8 cm) e cultivares de feijão de 4 grupos comerciais (Cavalo, Jalo, Carioca e Preto). Constatou-se que a deposição da semente a 2 cm de profundidade é a mais indicada para os grupos comerciais avaliados e quando superior a 2 cm afeta negativamente a emergência, índice de velocidade de emergência, coeficiente de velocidade de emergência, altura de plântula aos 9 e 21 dias após semeadura, massa verde e seca da parte aérea, massa verde e seca do sistema radicular. Palavras-chave: deposição de semente; estande de plântulas; Phaseolus vulgaris L.; vigor Emergence and early development of bean seedlings at different sowing depths ABSTRACTBean productivity in Brazil is low, even with improved cultivars with high potential yield. The factors affecting productivity include the inappropriate sowing depth that results in poor germination and emergence, adversely affecting the initial and final stand of plants in the field. This study aimed to evaluate the effects of different sowing depths on the emergence and early development of bean cultivars of four trade groups. The factorial design 5x4 was used in the completely randomized experimental design with four replications, five sowing depths (1, 2, 4, 6 and 8 cm) and bean cultivars of four trade groups (Cavalo, Jalo, Carioca and Preto) was used. Seed deposition at 2 cm deep is the most suitable for the evaluated trade groups and deposition deeper than 2 cm adversely affects the emergence, emergence speed index and emergence speed coefficient, seedling height at 9 and 21 days after sowing, green and dry mass of the aerial part, green and dry mass of the root system.

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Emergência e crescimento inicial de cultivares de Urochloa em diferentes profundidades de semeadura

Cited by 17 publications

References 10 publications

Seed longevity and seedling emergence rate of Urochloa decumbens as influenced by sowing depth in a Cerrado soil

Seed longevity and seedling emergence rate of Urochloa decumbens as influenced by sowing depth in a Cerrado soil

Emergency Brachiaria Decumbens a Function of Depth of Seeds in Soil Profile

Emergência e desenvolvimento inicial de plântulas de feijão em diferentes profundidades de semeadura

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