Diferimento de pastos de Brachiaria decumbens adubados com nitrogênio no início e no final do período das águas

Teixeira, Fábio Andrade; Bonomo, Paulo; Pires, Aureliano José Vieira; Silva, Fabyano Fonseca e; Rosa, Raul Castro Carriello; Nascimento, Paulo Válter Nunes

doi:10.1590/s1516-35982011000700012

Cited by 9 publications

(10 citation statements)

References 16 publications

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“…The effect of seasonal defoliation on canopy growth in the following seasons is due, in part, to the phenotypic plasticity of the forage plant, which is gradual (NELSON, 2000). The heaviest tillers in the 30/15 cm and 45/15 cm pastures (Table 3) may have predisposed these pastures to greater tipping TEIXEIRA et al, 2011), with negative effects on structure and grazing efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Marandu palisade grass management strategies at the beginning of the deferment period and effects on tillering

Santos

Ávila

Carvalho

et al. 2018

SCA

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Pasture mowing at the beginning of deferment stimulates tillering and can be used in different ways. The aim of this study was to understand how the mowing of Urochloa brizantha cv. Marandu Syn. Brachiaria brizantha cv. Marandu (marandu palisade grass) prior to the deferment period modifies tillering activity and the characteristics of young, mature, and old tillers. Three mowing strategies were evaluated: canopies kept at a height of 15 cm for five months before deferment (15/15 cm); canopies kept at 30 cm (30/15 cm) or 45 cm (45/15 cm) for five months before deferment and posteriorly cut to 15 cm at the start of the deferment period. The structural characteristics of young, mature, and old tillers of marandu palisade grass were compared only at the end of the deferment period. The tiller appearance rate was greater before (16.0%) than during (6.4%) the deferment period, but a contrasting response pattern was observed for the tiller mortality rate. The defoliation strategies that resulted in greater numbers of tillers in the canopies were 30/15 cm (2,098 tillers m -²) and 45/15 cm (2,160 tillers m -2 ). The defoliation strategy that generated the greatest percentage of young tillers in the canopy was 45/15 cm (26.1%), while the percentage of old tillers was greater in the canopies submitted to the 15/15 cm (64.1%) and 30/15 cm (61.5%) strategies. Weight and percentage of live stems of mature and old tillers were greater in relation to young tillers. The percentage of live leaves was grater in young tillers (52.6%), intermediate in mature tillers (41.4%), and lower in old tillers (21.3%). Regarding the percentage of dead leaves, the opposite trend was observed, where the percentage was greater in the old than in young tillers. Leaf area was greater in mature tillers (55.3 cm²) than in old tillers (29.2 cm²). Mowing of the marandu palisade grass to 15 cm at the beginning of the deferment period increases the number of young tillers, which have a more favorable morphological composition than mature and old tillers. (61,5 %). O peso e a percentagem de colmo vivo dos perfilhos maduros e velhos foram maiores em relação ao do perfilho jovem. A porcentagem de folha viva foi maior nos perfilhos jovens (52,6 %), intermediária no perfilho maduro (41,4 %) e menor no perfilho velho (21,3 %). A porcentagem de folha morta apresentou padrão de resposta contrário ao observado para a percentagem de folha viva. A área foliar foi maior no perfilho maduro (55,3 cm²) e menor no perfilho velho (29,2 cm²). O rebaixamento do capim-marandu de 45 para 15 cm no início do diferimento aumenta o número de perfilhos jovens no dossel e esses perfilhos possuem melhor composição morfológica, em relação aos maduros e velhos. Palavras-chave: Área foliar. Composição morfológica. Idade do perfilho. Urochloa brizantha.

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Section: Resultsmentioning

confidence: 99%

“…In the southeastern and centralwestern regions of Brazil, this is usually performed in late summer and autumn (SANTOS et al, 2009;TEIXEIRA et al, 2011). This approach guarantees forage mass in periods of scarcity and minimizes the negative effects of seasonal forage production in animal production systems (SANTOS et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Marandu palisade grass management strategies at the beginning of the deferment period and effects on tillering

Santos

Ávila

Carvalho

et al. 2018

SCA

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“…Nitrogen is an essential element directly related to forage quality (Teixeira et al, 2011), for participating in the synthesis of organic compounds that form the plant structure, for example: amino sugars, amines, amides, vitamins, pigments, amino acids, proteins, nucleic acids, and chlorophyll (Mengel & Kirkby, 2001). In addition, N is responsible for tillering, size of leaves and stems and for protein formation (Epstein & Bloom, 2005).…”

Section: Introductionmentioning

confidence: 99%

Brachiaria sp yield and nutrient contents after nitrogen and sulphur fertilization

Heinrichs

Grano²,

Bueno

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYAmong the production factors, adequate fertilization is an important tool to raise the productivity of pastoral systems and consequently increase the share of Brazil in the supply chain of primary agricultural products at the global level. The objective of this study was to evaluate the interaction of nitrogen and sulfur fertilization in Brachiaria decumbens Stapf. The experiment in pots with Dystrophic Oxisol was evaluated in a completely randomized design with four replications in a 5 x 3 factorial arrangement, involving five N doses (0, 100, 200, 400, and 800 mg dm -3 ) in the form of ammonium nitrate and three S doses (0, 20 and 80 mg dm -3 ) in the form of calcium sulfate, with a total of 15 treatments. In the treatments with low S dose, calcium was provided as calcium chloride, to ensure a homogeneous Ca supply in all treatments. The results showed that the tiller production and dry weight of green leaves and of stems + sheaths and total dry weight were favored by the combination of N and S fertilizer, while the proportion of dry leaves was reduced. Nitrogen fertilization raised the N contents in green leaves and stems + sheaths and reduced K contents in fresh and dry leaves. The response to S rates in the N content of green leaves was quadratic.Index terms: fertilization, Brachiaria decumbens, plant nutrition, forage plants.(1) Received for publication on July 3, 2012 and approved on May 14, 2013.(2) Professor, Univ Estadual Paulista "Júlio de Mesquita Filho", UNESP/Campus de Dracena. Rodovia SP 294, km 651. CEP 17900-000 Dracena (SP

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“…A adubação nitrogenada ao reduzir a respiração de manutenção e estimular a de crescimento -diretamente proporcional ao conteúdo proteico da planta e responsável pela produção de novos compostos orgânicos -contribui positivamente para maior acúmulo de biomassa (Plénet and Lemaire, 1999, Gastal et al, 2010, Lemaire et al, 2015. A aplicação de N estimula o desenvolvimento dos primórdios foliares, diminui o intervalo de tempo para o aparecimento de folhas, redução da senescência foliar, promoção do perfilhamento e produção de lâminas foliares, as quais proporcionam maiores taxas fotossintéticas das plantas e o maior fornecimento de fotoassimilados para os tecidos em crescimento (Paciullo et al, 1998, Lemaire et al, 2008, Teixeira et al, 2011. .…”

Section: Resultsunclassified

Índice de nutrição nitrogenada em pastagens de Trachypogon plumosus nos cerrados de Roraima

Costa

Gianluppi

Moraes³

et al. 2017

Pubvet

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RESUMO. O efeito de níveis de nitrogênio (0, 40, 80, 120, 160 e 200 kg de N ha -1 ) sobre a produtividade de forragem e o índice de nutrição nitrogenada (INN) em pastagens de Trachypogon plumosus foi avaliado em condições de campo. A adubação nitrogenada afetou quadraticamente os rendimentos de forragem da gramínea e seus teores de nitrogênio, sendo os máximos valores estimados com a aplicação de 154,6 e 102,1 kg de N ha -1 , respectivamente. O nível crítico de N foi reduzido com o aumento da produtividade de forragem. O INN, para todos os níveis de N avaliados, foi insuficiente para suprir o nível crítico de N da gramínea. Os níveis críticos de N, a eficiência de utilização e sua recuperação aparente foram inversamente proporcionais às doses de N aplicadas.Palavras chave: Eficiência de utilização de nitrogênio, recuperação aparente de nitrogênio, matéria seca Nitrogen nutrition index of Trachypogon plumosus pastures in Roraima´s savannasABSTRACT. The effect of nitrogen levels (0, 40, 80, 120, 160, and 200 kg of N ha -1 ) on the forage yield and nitrogen nutrition index (NNI) of pastures of Trachypogon plumosus was evaluated under field conditions. Nitrogen fertilization quadratically affected grass forage yields and its nitrogen content, and the maximum values were estimated by the application of 154.6 and 102.1 kg N ha -1 , respectively. The critical level of N was reduced with increased grass forage yield. The NNI, for all levels of N evaluated, was insufficient to supply the critical level of N of the grass. The NNI, efficiency of utilization and apparent N recovery were inversely proportional to the increased N levels.

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Diferimento de pastos de Brachiaria decumbens adubados com nitrogênio no início e no final do período das águas

Cited by 9 publications

References 16 publications

Marandu palisade grass management strategies at the beginning of the deferment period and effects on tillering

Marandu palisade grass management strategies at the beginning of the deferment period and effects on tillering

Brachiaria sp yield and nutrient contents after nitrogen and sulphur fertilization

Índice de nutrição nitrogenada em pastagens de Trachypogon plumosus nos cerrados de Roraima

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