Acúmulo de forragem e estrutura do dossel de Capim-Marandu diferido e adubado com nitrogênio

Carvalho, R. M.; Alves, L. C.; Rodrigues, Paulo Henrique Mazza; Souza, Wander de; Ávila, A. B.; Santos, Manoel Eduardo Rozalino

doi:10.17523/bia.v74n1p1

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Fertilizations with 200 and 300 kg ha -1 yr -1 of N were most likely to satisfy the nutrient demand and promoted greater speeds of appearance and elongation of the plant's shape and organs until the grazing frequency determined by height was reached. The N fertilization of tropical grasses increases the forage accumulation (32,33,34) . It is thus essential to adjust the stocking rate for each N dose applied to allow grazing animals to consume the forage produced.…”

Section: Discussionmentioning

confidence: 99%

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

Sousa

Montagner

Araújo

et al. 2022

Rev. Mex. Cienc. Pecu.

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This work aimed to evaluate the effects of three nitrogen (N) doses on the morphogenic and structural characteristics, root mass (RM) and distribution in the soil profile, and penetration soil resistance of Mombasa guineagrass pastures managed with rotational stocking. The experimental design used randomized blocks with three N doses (100, 200, and 300 kg ha-1) and three replicates. The criterion for interrupting the pastures’ regrowth was the height of 80 to 90 cm of the canopy (90–95 % of light interception by the canopy). The animals were removed from the paddocks when the canopy reached 50 % of the pre-grazing height. Forage mass and accumulation, canopy morphogenic and structural characteristics, RM and distribution in the soil profile, and soil resistance to penetration were evaluated. In pastures fertilized with 200 and 300 kg ha-1 of N, the highest leaf appearance (0.090 and 0.081 leaves-1 tiller-1 d-1), elongation rates (2.82 and 2.61 cm tiller-1 d-1) and highest daily forage accumulation (113.8 and 106.6 kg ha-1d-1) were observed. Using 300 kg ha-1 of N promoted greater soil resistance to penetration at 10 cm of depth in the post-grazing (3.3 MPa). No effect of N doses was observed for RM (P>0.05). The pre- and post-grazing height control of animals in the paddocks therefore helped to maintain the pasture structure and avoid the soil compaction process. According to the results, it is concluded that 200 and 300 kg ha-1 of N fertilization is a strategy for intensifying pastures.

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Section: Discussionmentioning

confidence: 99%

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

Sousa

Montagner

Araújo

et al. 2022

Rev. Mex. Cienc. Pecu.

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“…Considering that the time the pasture remains deferred (Santos et al, 2009b;Gouveia, Fonseca, Santos, Gomes, & Carvalho, 2017) and N fertilisation (Carvalho et al, 2017;Sousa et al, 2019) interfere with the dynamics of forage grass growth and also modify the structure of the deferred pasture, the hypotheses of this work are: i) the reduction of the deferment period can be partially compensated by the application of higher N doses, so as to result in a relatively constant forage mass at the end of the deferment period; and ii) the adoption of a short deferment period, combined with N fertilisation, improves the structural characteristics of the deferred canopy. Therefore, this work was conducted to test the two hypotheses previously presented, as well as to evaluate the structural characteristics of Brachiaria brizantha syn.…”

Section: Introductionmentioning

confidence: 99%

Structure of piatã palisadegrass deferred for two periods and fertilised with nitrogen

Rocha

Santos

Vilela

et al. 2020

SCA

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The deferred pasture structure determines the consumption and performance of grazing animals and, in addition, can be influenced by the duration of the deferment period and nitrogen (N) fertilisation. The objective of this work was to evaluate the structural characteristics of Brachiaria brizantha syn. Urochloa brizantha cv. Piatã (piatã palisadegrass) deferred for two periods (79 and 127 days) and with four N doses (0, 40, 80 and 120 kg ha-1) in the Zona da Mata of Minas Gerais, Brazil. The experimental design involved complete randomised blocks and a subdivided plot scheme, with three replications. The 127-day period of deferment resulted in a higher forage mass, falling index, stem percentage and density, but a lower number of tillers, percentage and volumetric density of live leaf blade. The N dose increment, in general, worsened the structural characteristics of the piatã palisadegrass deferred for 127 days. However, with the 79-day period, the N fertilisation increased the volumetric density of live leaf blades and reduced the stem percentage in the forage mass. As a preliminary recommendation, piatã palisadegrass can be deferred for 79 days and fertilised with up to 90 kg ha-1 of N in the region of Zona da Mata de Minas Gerais, Brazil.

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“…Apart from nitrogen, potassium which is the cation found in the highest concentration in plants is responsible for pertinent physiological and metabolic functions, including enzymatic activation, photosynthesis, the translocation of assimilates and osmotic control (Taiz & Zeiger, 2013). The increased nitrogen fertilization boosts forage output, producing a higher stem percentage by introducing changes in the structural features, which may result in losses for animal grazing (Carvalho et al, 2017). However, the increased potassium fertilization provides improvements in terms of the productive and phytometric characteristics, as potassium plays significant roles in the synthesis, conversion, and allocation of the metabolites, and maintains the nutritional balance.…”

Section: Introductionmentioning

confidence: 99%

Interaction between nitrogen and potassium in fertilization of the piatã grass (Urochloa brizantha): productive and phytometric characteristics

Bonfim-Silva¹,

Morais²,

Pacheco³

et al. 2018

Aust J Crop Sci

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In this study, the aim was to determine the phytometric and productive features of Urochloa brizantha cv. BRS Piatã cultivated in Oxisol under the influence of the nitrogen and potassium doses applied. The completely randomized experimental design was adopted in a 5x5 factorial scheme, supplying five doses of nitrogen (0, 100, 200, 300 and 400 mg dm-3) and five doses of potassium (0, 90, 180, 270 and 360 mg dm-3), with four replications. Three shoots were cut at 30-day intervals. Plant height, number of leaves, number of tillers, leaf dry mass, stem dry mass and leaf /stem ratio were assessed. The leaf dry mass at the 370, 287 and 259 mg dm-3 doses of nitrogen in combination with the 360 mg dm-3 potassium doses revealed the biggest yields (7.8, 16.9 and 11.5 g pot-1) for the first, second and third cuts, respectively. Therefore, it was revealed that nitrogen and potassium affected the phytometric characteristics in this grass in an isolated manner by doses of nitrogen potassium. The nitrogen and potassium doses interacted positively to present significantly productive characteristics at all the three cutting procedures performed in the Piatã grass when the nitrogen to potassium ratio was maintained at about 1: 1.

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Acúmulo de forragem e estrutura do dossel de Capim-Marandu diferido e adubado com nitrogênio

Cited by 4 publications

References 7 publications

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

La interfaz suelo-planta en Megathyrsus maximus cv. Mombasa sometida a diferentes dosis de nitrógeno en pastoreo rotacional

Structure of piatã palisadegrass deferred for two periods and fertilised with nitrogen

Interaction between nitrogen and potassium in fertilization of the piatã grass (Urochloa brizantha): productive and phytometric characteristics

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