Piata palisade grass deferred with two distinct initial heights: luminous environment and tillering dynamics

Abstract

The study was carried out between March 1st and July 1st, 2011, in order to evaluate the tillering pattern of the deferred Piata palisade grass (Brachiaria brizantha cv. Piata). Three sward heights were evaluated in the beginning of the period of deferment: lower (20 cm), medium (30 cm) and higher (40 cm). The experimental design was of completely randomized blocks with three replications. The Piata palisade grass deferred with low initial height presented lower leaf area index, lower light interception and higher leaf angle in relation to the ones deferred with medium and high heights. The advance in the period of deferment increased the leaf area index and the light interception by the sward, in a way that the highest values were recorded in the periods from 91 and 120 days. The leaf angle reduced linearly with the advance in the period of deferment. For basal and aerial tillers, the rates of appearance, mortality and survival of tillers, as well as the balance between appearance and mortality, and the tiller density stability index were not affected by the initial height of the sward. The stability index of the tiller density was lower in the period from 1 to 30 days of deferment in relation to the periods from 31 to 60, from 61 to 90 and from 91 to 120 days. The variation of the initial height of the Piata palisade grass does not influence the tiller density dynamics during the period of deferment. The reduction of the initial height of the Piata palisade grass improves the luminous environment inside the sward, but it does not stimulate the grass tillering during the period of deferment.

How the Intercropping between Corn and Palisade Grass Cultivars Affects Forage Production and Pastures Characteristics under Grazing

“…[25] observed that the amount of rain favored the appearance of new leaves, verified by increasing the density of Marandu. The average density found by [24] was 163.5 kg•cm −1 from January to early April. Mass of leaves, stems and dead material was similar (P > 0.05) between the cultivars, both pre-and postgrazing.…”

“…These authors observed differences in methods to detect seasonal variations in this variable and verified that the LAI measured at LICOR showed differences only between summer and other seasons. In Piata cultivar [24] obtained LAI values of 5.06 and 5.25, respectively in heights of 0.3 and 0.4 m in March.…”

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

“…Essa categorização foi possível mediante o uso da técnica de dinâmica de perfilhamento, que quantifica o aparecimento e morte dos perfilhos em avaliações mensais. A dinâmica de perfilhamento iniciou em outubro de 2013, sendo realizada durante todo o período experimental dentro de duas áreas delimitadas por tubo de PVC de 30 cm de diâmetro, usando fios de diferentes cores para identificar cada geração de perfilhos (11) . Isso permitiu identificar os números de perfilhos jovens, com menos de dois meses de idade; maduros, entre dois e quatro meses; e velhos, com mais que quatro meses (12) .…”

Morphogenesis of age groups of Marandu palisade grass tillers deferred and fertilised with nitrogen

“…However, recent studies on tropical forage grasses, aimed at understanding the adaptive mechanisms of plants used for forage production, have emphasised the importance of adopting management strategies as a way to modulate the growth of deferred pastures (SOUSA et al, 2013;TEIXEIRA et al, 2014). Thus, by identifying the most suitable time of starting the deferment period in a particular region, the variations in deferment period (SANTOS et al, 2009), the control of pasture height at the beginning of the deferment period (SOUSA et al, 2013) and the nitrogen fertilisation strategy (TEIXEIRA et al, 2014) can be used to define the amount of forage produced as well as the structure and nutritive value of the deferred pasture.…”