Valor nutritivo do capim-braquiária no primeiro ano de recuperação com aplicações de nitrogênio e enxofre

Oliveira, Daniela Alves de; Bonfim-Silva, Edna Maria; Silveira, Cristiane Prezotto; Monteiro, Francisco Antônio

doi:10.1590/s1516-35982010000400004

Cited by 12 publications

(10 citation statements)

References 10 publications

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“…In forages, ADF values around 30% are considered ideal for animal intake (Miranda et al, 2018). The ADF contents reported in this study are consistent with the digestibility of the forage, indicating low levels of lignified components, which is favorable to the digestibility and use of the ingested plant (Oliveira, Bonfim-Silva, Silveira, & Monteiro, 2010). Meschede, Velini, Carbonari and Moraes (2011) tested the effect of glyphosate on chemical variables of U. decumbens, with the initial glyphosate dose of 32 g a.e.…”

Section: Dm)supporting

confidence: 74%

Effect of glyphosate drift on marandu grass

Codognoto¹,

Conde²,

Amorim³

et al. 2021

Semina: Ciênc. Agrár.

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Glyphosate drift in plants that are not resistant to the herbicide molecule can result in stimulation to certain biological features, characterizing the phenomenon of hormesis. On this basis, productive and chemical traits were evaluated in marandu grass, in a simulation of the drift effect, using sublethal doses of the herbicide glyphosate. The experiment was in laid out in a randomized-block design with split plots in time, in four replicates. The effect of sublethal doses of glyphosate acid equivalent (a.e.) (21.60, 43.20, 64.80, 86.40 and 108.00 g ha-1) and control was evaluated in the plots; and the effect of harvesting at 92, 113, 134 and 155 days after sowing (DAS) the grass was evaluated in the subplots. The Urochloa brizantha cv. Marandu was collected at a height of 0.20 m, at a defoliation interval of 21 days, to estimate production and chemical traits, in experimental plots with a usable area of 7.5 m2. Leaf: stem ratio was influenced by the interaction between the evaluated factors (dose and harvest). Dose fitted a second-order polynomial model, with a hormesis effect of 21.60 to 76.50 g ha-1 of glyphosate a.e. Harvesting at 134 DAS differed significantly from 92 DAS. The forage yield showed a linear response inversely proportional to the increasing glyphosate doses. There was a polynomial increase in leaf phosphorus content, characterizing hormesis up to the sublethal dose of 72.50 g a.e. ha-1. Harvest influenced the neutral detergent fiber, acid detergent fiber, lignin and leaf phosphorus contents.

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Section: Dm)supporting

confidence: 74%

Effect of glyphosate drift on marandu grass

Codognoto¹,

Conde²,

Amorim³

et al. 2021

Semina: Ciênc. Agrár.

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“…The AFD levels obtained in this study (Table 3) positively relate to the digestibility of forage, indicating low levels of lignified components, favoring digestibility and the use of ingested forage (Oliveira, Bonfim-Silva, Silveira, & Monteiro, 2010). AFD in forages with values of approximately 30% are considered ideal for animal consumption (Miranda et al, 2018).…”

Section: Glyphosatementioning

confidence: 71%

Glyphosate in the production and forage quality of marandu grass

Codognoto¹,

Conde²,

Maltoni³

et al. 2021

Semina: Ciênc. Agrár.

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The drift of the herbicide glyphosate, used for desiccating crops or controlling weeds, can result in growth-promoting or non-target plant development effects. Thus, it is possible to use the compound to increase the biomass of forage through the hormone effect. The objective of this study was to evaluate the effects of sublethal doses of glyphosate on the production of Urochloa brizantha cv. Marandu (Marandu grass) and its nutritional quality in ruminants. The design used was completely randomized, with five replications in a factorial scheme. The treatments used were as follows: control (without glyphosate application) and four sublethal doses of glyphosate (4, 10, 14, and 20 g ha-1 of the acid equivalent). The monthly collections consisted of collecting the plant material (0.20 m) from the surface, comprising of leaves and pseudocolmos (stem and leaf sheath) to determine the dry matter production and forage chemical-bromatological parameters. The results showed that leaf/stem ratio, neutral detergent fiber, and acid detergent fiber were affected exclusively by the harvest factor. The hormone effect of the herbicide occurs in the production of dry matter and lignin in the evaluated subdoses. For crude protein, there was an interaction between the factor doses and harvest, due to the effect of glyphosate and the management applied to the harvests, showing that the sublethal doses of glyphosate promoted the production of dry matter and the food quality of Marandu grass.

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“…However, lower levels of ADF in the forage mass is expected, since this attribute works as an indication of the energy level and digestibility of the diet offered to the animals (OLIVEIRA et al, 2010). Therefore, the lower the ADF value, the higher the energy index and forage digestibility.…”

Section: Chemical Composition Of Morphological Structuresmentioning

confidence: 99%

Nutritional evaluation of Brachiaria brizantha cv. Marandu cultivated in soils developed from basalt and sandstone in the state of Paraná

Guerra

Becquer

Vendrame

et al. 2019

SCA

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Determining the nutritional composition of a pasture is necessary to evaluate its quality, aiming to meet the requirements of feeding animals and guarantee good performance. The quality of the forage biomass produced depends directly on the fertility and type of soil, environmental conditions, and management. In this scenario, the aim was to evaluate the chemical composition, in vitro digestibility of dry matter, and macro- and micronutrient contents of Brachiaria brizantha cv. Marandu cultivated in soils developed from basalt and sandstone in the state of Paraná. A total of 120 forage samples were collected in a soil developed from basalt and 116 in soil developed from sandstone. Forage harvesting occurred in autumn and spring for basalt soil (season effect), and in spring (soil effect) for sandstone soil. Soil samples (0–20 cm) were collected in the spring season, at the same forage collection sites, to obtain a greater sample representativity regarding climate–soil–plant relationships. Forage samples were separated in leaf blade and stem + sheath, and analyses of dry matter (DM), mineral matter (MM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin, cellulose, hemicellulose, in vitro dry matter digestibility (IVDMD), total digestible nutrients (TDN), nitrogen, and macro- and micronutrient contents were performed. In soil samples, the contents of P, K, Ca, Mg, Mn, and Zn were analyzed. There were season and soil-type effects on the chemical composition of the cultivar studied. The highest levels of protein, NDF, ADF, lignin, and cellulose were obtained in autumn. In samples from soil developed from basalt, higher levels of hemicellulose, IVDMD, and TDN were obtained in the spring. K, P, Mn, and Zn presented levels within the range recommended for the studied forage, but the values of Ca and Mg in autumn and N in the three studied periods remained below the level considered adequate. Soil nutrient contents were influenced (P < 0.05) by the soil source material, and the highest levels of K, Ca, Mg, Mn, and Zn were observed in soil developed from basalt. Forage cultivated in spring in the soil area developed from basalt, was nutritionally superior in relation to forage cultivated in the soil developed from sandstone.

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Valor nutritivo do capim-braquiária no primeiro ano de recuperação com aplicações de nitrogênio e enxofre

Cited by 12 publications

References 10 publications

Effect of glyphosate drift on marandu grass

Effect of glyphosate drift on marandu grass

Glyphosate in the production and forage quality of marandu grass

Nutritional evaluation of Brachiaria brizantha cv. Marandu cultivated in soils developed from basalt and sandstone in the state of Paraná

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