Sward Structure and Nutritive Value of Urochloa Ruziziensis Under Nitrogen and Potassium Fertilisation

Lima, Karla Rodrigues de; Carvalho, Carlos Augusto Brandão de; Azevedo, Flávio Henrique Vidal; Malafaia, Pedro

doi:10.1590/1983-21252017v30n124rc

Cited by 4 publications

(7 citation statements)

References 19 publications

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“…Across these studies high amounts of ash in Megathyrsus, low lignin in Urochloa and low amounts of crude protein in Cynodon were consistently observed. The chemical constituent findings are consistent with other reports for Cynodon (34) , Megathyrsus (35) , Urochloa (36) and Andropogon (29) , suggesting potential inherent growth differences in their plant tissues (33) . Fertilization with N modified the amount and distribution pattern of the nutrients in these plants (Table 1).…”

Section: B1 Fraction = Nds -Asupporting

confidence: 91%

“…Second, the B2 pool was reduced by 15.4 %. At different levels of N fertilization the same effect on NDF it has been demonstrated (36) . The positive effect of N fertilization in reducing the NDF content is offset by a negative effect in increasing lignification.…”

Section: B1 Fraction = Nds -Amentioning

confidence: 69%

“…Fertilization also reduces the NDF content with most of this decrease occurring in hemicellulose, most of which is deposited in the secondary wall as plants mature. An increase in CP and reduction of NDF has also been found in Urochloa ruziziensis fertilized with 120 kg/N/ha and harvested at 30 d of regrowth (36) .…”

Section: B1 Fraction = Nds -Amentioning

confidence: 69%

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In vitro ruminal degradation of carbohydrate fractions in tropical grasses fertilized with nitrogen

Hernández

Lagunes

Pell

et al. 2020

Rev. Mex. Cienc. Pecu.

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Our goal was to determine the digestion rates of carbohydrate fractions A (sugars, oligosaccharides and organic acids), B1 (starch and soluble fiber), NSC (non-structural carbohydrates) and B2 (available NDF) in four tropical grasses using the gas production technique. Samples of whole forage (WF), residue insoluble in 90% ethanol (EIR) and isolated NDF (ND) were fermented in vitro and gas production measured. Gas volumes determined from the following fractions, A = WF minus EIR; B1 = EIR - ND; NSC = WF - ND; and B2 = ND. Grasses were Andropogon gayanus, Urochloa brizantha, Cynodon plectostachyus, and Megathyrsus maximum each grown in Veracruz, Mexico on four plots (5×5 m), fertilized (relationship equivalent to 0 and 100 kg N/ha) and clipped 35 d after the N fertilization. A complete randomized block design with factorial arrangement 4×2 and two replicates per treatment was used. Factors were grass species and N fertilization. Data were fit using a single-pool exponential model with lag. The volume (mL gas/100 mg OM), rate (%/h) and lag (h) were: WF (22.8; 5.3; 2.1); A (3.2; 15.7; 0.5); B1 (1.5; 15.7; 0.2); and B2 (18.3; 6.6; 5.2). Andropogon and Urochloa had higher NSC content compared to Megathyrsus and Cynodon but lower gas yield per unit of NSC. Rates of digestion for the B2 fraction ranged from 4 to 8 %/h; and NSC digestion rate averaged 15.7 %/h. Nitrogen fertilization reduced carbohydrate pool sizes but did not affect rates of digestion. It is concluded that ruminally available energy from SC and NSC in tropical forages should be revised more extensively.

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Section: B1 Fraction = Nds -Asupporting

confidence: 91%

Section: B1 Fraction = Nds -Amentioning

confidence: 69%

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In vitro ruminal degradation of carbohydrate fractions in tropical grasses fertilized with nitrogen

Hernández

Lagunes

Pell

et al. 2020

Rev. Mex. Cienc. Pecu.

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“…Studies have reported positive results from the use of nitrogen for straw yield; however, high doses of fertilization result in the lodging of plants, causing significant yield losses (Zakirullah et al, 2017;Marolli et al, 2018). Hawerroth et al (2013), Sunilkumar & Tareke (2016) and Lima et al (2017) confirmed that the application of nitrogen as topdressing increases the protein concentration in oat grains. However, the nutrient absorption capacity varies between cultivars, soil fertility and meteorological and environmental factors such as humidity, temperature, photoperiod and radiation.…”

Section: Resultsmentioning

confidence: 61%

Technical and agronomic efficiency of nitrogen use on the yield and quality of oat grains

Mantai

Silva

Carbonera

et al. 2021

Rev. bras. eng. agríc. ambient.

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The efficiency of nitrogen use by oats in association with climatic conditions is fundamental to the development of more sustainable managements with yield and quality. The objectives of this study were to define the agronomic efficiency of nitrogen by the ratio of the dose provided and product obtained, estimate the maximum technical efficiency of the nutrient on grain yield; and for the optimum dose, simulate the expression of the straw and industry yields, protein and total fiber in different conditions of the agricultural year in a soybean/oat system. The study was conducted from 2011 to 2016, in Augusto Pestana, RS, Brazil, in a randomized block design with four repetitions in a 4 x 2 factorial referring to nitrogen doses (0, 30, 60 and 120 kg ha-1) and oat cultivars (Barbarasul and Brisasul) in a soybean/oat system. Nitrogen increased grain, straw, and industry yields and total grain protein, with agronomic efficiency of 7.8, 19.7 and 3.3 kg ha-1 and 0.10 g kg-1, respectively, with reduction of the total fiber in 0.05 g kg-1 per kg of N supplied. The dose of maximum technical efficiency in the expression of grain yield is dependent on the weather conditions during cultivation. In general, the maximum efficiency of grain productivity was obtained with 86 kg ha-1 of N, with linear equations showing increased productivity of straw and industry yield, total protein, and reduction of the fiber content of oat grains by nitrogen use.

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“…Among the management technologies, the highlight is nitrogen fertilization, an essential element in the development and elaboration of oat grains (Mantai, 2019). Nitrogen directly participates in the biosynthesis of numerous organic compounds, altering the expression of indicators of grain yield and industrial and chemical quality (Lima et al, 2017;Obour et al, 2018). According to Ma et al (2012), the crop can respond positively to nitrogen fertilization, in terms of plant growth; however, it can limit the use of high nitrogen rates for grain yield.…”

Section: Introductionmentioning

confidence: 99%

Research Article Nitrogen levels in oat grains and its relation to productivity

Mantai¹,

Silva²,

Scremin³

et al. 2020

Genet. Mol. Res.

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Analysis of the relationship of oat grain chemical components with productivity can yield information that determines crop production strategies. The market values high protein grain, but production and other nutritional components may be affected in the effort to increase protein levels. The objective of this study was to determine how the dynamics of the components of oat grain chemical composition relate to productivity when adding nitrogen to the soil, in order to develop nutrient management strategies that can combine productivity with grain quality. The study was conducted from 2011 to 2016 in Augusto Pestana, Brazil, in a randomized block design with four replications in a 4x2 factorial design for nitrogen rates (0, 30, 60 and 120 kg.ha-1) and standard biotype oat cultivars used on a commercial scale (Barbarasul and Brisasul) in two succession systems soybean/oat and corn/oat, totaling 64 experimental units. The nitrogen doses were applied at the phenological stage of expanded fourth leaf using urea. The increase of nitrogen fertilization for topdressing promoted increase of the total protein of oat grains and reduction of the total fiber in both soybean/oat and corn/oat systems. Higher levels of grain protein due to nitrogen fertilization reduced grain production, regardless of the cropping system.

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Sward Structure and Nutritive Value of Urochloa Ruziziensis Under Nitrogen and Potassium Fertilisation

Cited by 4 publications

References 19 publications

In vitro ruminal degradation of carbohydrate fractions in tropical grasses fertilized with nitrogen

In vitro ruminal degradation of carbohydrate fractions in tropical grasses fertilized with nitrogen

Technical and agronomic efficiency of nitrogen use on the yield and quality of oat grains

Research Article Nitrogen levels in oat grains and its relation to productivity

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