Piata palisadegrass deferred in the fall: effects of initial height and nitrogen in the sward structure

Sousa, Bráulio Maia de Lana; Vilela, Hélio Henrique; Santos, Andreza Luzia; Santos, Manoel Eduardo Rozalino; Júnior, Domicio do Nascimento; Assis, Camila; Faria, Bruno Damaceno; Rocha, Gabriel de Oliveira

doi:10.1590/s1516-35982012000500008

Cited by 22 publications

(28 citation statements)

References 18 publications

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“…In any case, the objective is to remove old, senescent, and lowquality forage, consequently improving regrowth. Shorter pasture grass allows more light penetration, stimulating the appearance of new vegetative tillers and, consequently, increasing the nutritional value (SOUZA et al, 2012).…”

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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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: 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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“…More lenient cuts remove smaller quantity of forage, which results in larger remaining leaf area at the beginning of regrowth (Sousa et al, 2012). Thus, the greater forage mass at the end of the deferment period is partly due to the greater mass at the beginning of deferment.…”

Section: Figure 5 Number Of Vegetative (Veg) and Live (Live) Tillersmentioning

confidence: 99%

“…Conditions of more forage removal (low initial height) enable greater penetration of light inside the sward (Sousa et al, 2012), making regrowth possibly occur from new vegetative tillers (Table 3), which could explain its smaller masses of live stem, dead stem and dead leaf. According to Langer (1963), higher light intensities favored tillering.…”

Section: Figure 5 Number Of Vegetative (Veg) and Live (Live) Tillersmentioning

confidence: 99%

Initial height and nitrogen fertilization on deferred signalgrass

Silva¹,

Fonseca²,

Santos³

et al. 2015

Biosci. J.

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ABSTRACT:Thus study was conducted with the objective of evaluating production and forage characteristics of Signalgrass (Brachiaria decumbens cv. Basilisk) deferred at different initial heights and nitrogen doses. Three initial sward heights (low -10 cm, medium -20 cm and high -30 cm), three nitrogen doses (40, 80 and 120 kg/ha) and a control treatment, of no fertilization were evaluated. The experimental design utilized was of completely randomized blocks with three replications, in a subdivided-plot arrangement. There was no interaction between sward initial height and nitrogen dose for the variables analyzed. The Signalgrass deferred at an elevated initial height presented greater masses of forage, live stem, dead stem and dead leaves; higher percentage of dead stem and falling rate; and lower number of vegetative tillers, percentage of live leaves and live leaf/live stem ratio. Elevation in the nitrogen dose increase along with the number of live and vegetative tillers; masses of forage, live stem, dead stem, dead leaves and live leaves; percentage of live stem; and live tissue/dead tissue ratio; and reduced the percentage of dead leaves and the live leaf/live stem ratio. Signalgrass can be deferred at low and medium initial heights and varied nitrogen doses, according to the objectives and possibilities of the farmer.

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“…A adubação nitrogenada pode ser utilizada em pastagens diferidas como forma de aumentar o perfilhamento do pasto e a produção de forragem (2) . Outra importante vantagem do uso do nitrogênio em pastagens diferidas é a possibilidade de redução do período de diferimento dos pastos, sem diminuir a massa de forragem diferida.…”

Section: Introductionunclassified

Como a Idade Do Perfilho E a Adubação Nitrogenada Modificam as Características Estruturais Do Capim-Marandu Diferido?

et al. 2019

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ResumoEste estudo avaliou as características estruturais de perfilhos, com diferentes idades, do capimmarandu (Urochloa brizantha cv. Marandu) diferido e adubado. Foram avaliadas duas doses de nitrogênio (baixa, 50 kg ha -1 e alta, 200 kg ha -1 ), três categorias de idades de perfilhos (jovem, < 2 meses; maduro, 2 a 4 meses; e velho, > 4 meses;), além de dois períodos (início, 1 a 45 dias e fim, 46 a 90 dias) durante o diferimento. O delineamento experimental foi inteiramente casualizado, em esquema de parcela sub-subdividida, com quatro repetições. De modo geral, o perfilho jovem apresentou melhor composição morfológica (40,0% de lâmina foliar viva, P=0,0074; 39,2% de colmo vivo, P=0,0208; e 20,8% de lâmina foliar morta, P=0,0155), enquanto que o perfilho velho teve pior morfologia (7,3% de lâmina foliar viva; 54,8% de colmo vivo; e 38,0% de lâmina foliar morta) ao término do período de diferimento. A percentagem de perfilho velho foi maior (P=0,0019) no fim (54,0%) do que no início (43,4%) do período de diferimento. No início do diferimento o dossel adubado com alta dose de N apresentou (P=0,0447) maior percentual de perfilho jovem (36,8%) do que aquele sob baixa dose de N (28,6%). No fim do período de diferimento, tanto a alta como a baixa dose de nitrogênio resultaram (P=0,0276) em valores similares de perfilho jovem no dossel diferido (24,3%, em média). A maior dose de N, parcelada antes do período de diferimento, aumenta o percentual de perfilho jovem durante a fase inicial do diferimento. O perfilho jovem tem melhores características estruturais do que os perfilhos maduros e velhos. Palavras-chave: área foliar; composição morfológica; número de perfilho; Urochloa brizantha. AbstractThe structural characteristics of tillers with different ages of deferred and fertilized marandu palisade grass (Urochloa brizantha cv. Marandu) were evaluated. Two doses of nitrogen (low, 50 kg ha -1 and high, 200 kg ha -1 ), three age categories of tillers (young, <2 months, mature, 2 to 4 months, and old,> 4 months), and to two periods (beginning, 1 to 45 days and end, 46 to 90) during deferral were 2 CARVALHO, A.N. et al.Cienc. anim. bras., Goiânia, v.20, 1-12, e-44460, 2019 evaluated. The experimental design was completely randomized, in a subsubdivide plot scheme, with four replications. In general, young tiller had a better morphological composition (40.0% live leaf, P=0.0074; 39.2% live stem, P=0.0208; and 20.8% dead leaf blade, P=0.0155), while the old tiller had a worse morphology (7.3% live leaf, 54.8% live stem and 38.0% leaf dead) at the end of the deferral period. The percentage of old tillers was higher (P=0.0019) at the end (54.0%) than at the beginning (43.4%) of the deferment period. At the beginning of the deferment the canopy fertilized with high dose of N presented (P=0.0447) a higher percentage of young tiller (36.8%) than that under low N dose (28.6%). At the end of the deferment period, both the high and the low nitrogen doses resulted (P=0.0276) in similar values of young tiller in the deferred canopy (2...

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Piata palisadegrass deferred in the fall: effects of initial height and nitrogen in the sward structure

Cited by 22 publications

References 18 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

Initial height and nitrogen fertilization on deferred signalgrass

Como a Idade Do Perfilho E a Adubação Nitrogenada Modificam as Características Estruturais Do Capim-Marandu Diferido?

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