Sward structure and nutritive value of Alexandergrass fertilized with nitrogen

Salvador, Paulo Roberto; Pötter, Luciana; Rocha, Marta Gomes da; Hundertmarck, Anelise Pereira; Sichonany, M.J.O.; Neto, L.G. Amaral; Negrini, Mateus; Moterle, P.H.

doi:10.1590/0001-3765201620150180

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…There is an advantage due to stem length similarity in all N levels, as it prevents the greater stems accumulation in the forage mass. In addition, stems act as a physical barrier to bite formation (BENVENUTT et al, 2006) and can increase the participation of dead and senescent material in the forage mass (SALVADOR et al, 2016). According Ciência Rural, v.53, n.12, 2023.…”

Section: Discussionmentioning

confidence: 99%

“…Studies with nitrogen fertilization in Alexandergrass (Urochloa plantaginea (Link) Hitch) have been carried out in the southern region of Brazil (SARTOR et al, 2014;SALVADOR et al, 2016;HUNDERTMARCK et al, 2017). However, the literature shows no data about the hypothesis that the morphogenic response of this grass may be altered by the use of N. The understanding of these relationships, in the context of individual tillers, can provide more detailed information and support decisions on the management of N fertilization.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen nutrition index and morphogenesis in Alexandergrass of the Central Depression of Rio Grande do Sul

et al. 2023

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This study assessed the nitrogen nutrition index, morphogenic characteristics and tiller structure of Alexandergrass (Urochloaplantaginea (LINK) Hitch) pasture submitted to different nitrogen (N) levels (zero, 150 or 300 kg ha-1 of N). The experimental design was entirely randomized with repeated measures arrangement. The experimental animals were Angus heifers under rotational stocking grazing method. The number of animals was variable to keep 30±5 cm post-grazing sward height. Nitrogen nutrition index increased linearly according N levels (Ŷ = 59.8 + 0.1216N; P < 0.0001; r²=0.53). The leaf appearance rate adjusted to a positive linear regression model according the thermal sum (TS) with zero of N (Ŷ0N = 0.0077 + 0.0000087TS; P = 0.0308; r² = 0.72) and 150 kg ha-1 of N (Ŷ150N = 0.0020 + 0.000021 TS; P = 0.0022; r² = 0.92). The use of 300 kg ha-1 of N did not alter the leaf appearance rate (0.0124 leaf degree-days-1). The use of up to 300 kg ha-1 of N increases the Alexandergrass nitrogen content. The leaf appearance rate in Alexandergrass is modified using N while the morphogenic characteristics leaf expansion, stem expansion, phyllochron, leaf lifespan, leaf elongation duration and tiller structure are not altered by N utilization.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen nutrition index and morphogenesis in Alexandergrass of the Central Depression of Rio Grande do Sul

et al. 2023

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“…N is a part of the chlorophyll molecule, and its level determines a higher concentration of chloroplasts and higher efficiency in the capture of intercepted radiation. Numerous studies have reported that N promotes the growth of the foliar lamina [21,22]; consequently, an increased leaf growth rate allows higher grazing frequencies and, if forage productivity is also enhanced, it can lead to an increase in the stocking rate. Therefore, if this does not occur, the opportunity to graze foliar lamina is lost, owing to senescence.…”

Section: Discussionmentioning

confidence: 99%

Intensive Production and Management of Marandu Palisadegrass (Urochloa brizantha ‘Marandu’) Accelerates Leaf Turnover but Does Not Change Herbage Mass

et al. 2021

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Pasture intensification through higher stocking rates, nitrogen fertilization and intensified grazing management in beef cattle production optimizes pasture use by increasing the forage harvested. We aimed to assess its effects on the morphogenesis and canopy structure of Urochloa brizantha ‘Marandu’ (marandu palisadegrass) pastures. The treatments consisted of marandu palisadegrass pastures managed under continuous stocking and a canopy height of 25 cm, with different levels of intensification: extensive, semi-intensive, and intensive systems N-fertilized with 0 kg, 75 kg, and 150 kg N ha−1 year−1, respectively, as ammonium nitrate (32% of N), with four replicates (paddocks) in a completely randomized design. Phyllochron (9.8 days) and leaf lifespan (34.7 days) were shorter in intensified pastures, whereas herbage mass was similar among treatments. Extensive pastures had a higher proportion of senescent material; thus, more intensive systems showed higher proportions of leaves and stems, although the leaves-to-stem ratio remained similar across production systems. The defoliation interval was lower in intensive (14.4 days) and higher in extensive (18.7 days) treatments. Thus, pasture intensification accelerates leaf appearance, decreases leaf lifespan, shortens the tiller defoliation interval and increased herbage accumulation rate but does not change herbage mass. The extensive system produces excessive forage losses due to dead material.

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“…In the search for greater beef cattle production efficiency, Alexander grass (Urochloa plantaginea (Link.) Hitch) is a forage alternative with great production potential that provides suitable feed for post-weaning heifers (Costa et al, 2011), and it is possible to raise 2.3 extra heifers per hectare when the Alexander grass is fertilized with nitrogen (Salvador et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Forage intake by heifers on alexander grass (Urochloa plantaginea (Link.) Hitch) fertilized with different levels of nitrogen

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et al. 2021

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This work was conducted to study the efficiency of using nitrogen on Alexander Grass (Urochloa plantaginea (Link.) Hitch) through information about the characteristics of the pasture and forage intake of beef heifers. The experiment was carried out at the Federal University of Santa Maria (Universidade Federal de Santa Maria, UFSM) in Santa Maria, Rio Grande do Sul, Brazil, from January to April of 2014. The treatments consisted of doses of zero, 150, or 300 kg/ ha nitrogen (N) in the form of urea. The study used a rotational pasture method and 16 Angus heifers with a mean initial age and body weight (BW) of 15 months and 276 ± 17.4 kg, respectively. Forage intake was evaluated by treating two picketed test heifers with chromium oxide (Cr2O3) for eleven days as an external indicator of fecal production. The experimental design was completely randomized, and the measurements were repeated over time with three treatments and two repetitions per area. Crude protein content was 3.4% higher under 300 kg/ha nitrogen fertilization compared to 150 kg/ ha (18.7%). Independent of the N application rate, the heifers ingested 2.2 ± 0.09 kg DM 100/ kg BW of forage. Nitrogen fertilization of Alexander grass modified the structure of the pasture, increasing the quality and total production of the forage. Heifers pastured on Alexander grass fertilized with 300 kg/ha nitrogen harvested forage with higher levels of crude protein. The structural change in the canopy let the heifers reduce their consumption of forage at the end of the Alexander grass life cycle.

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Sward structure and nutritive value of Alexandergrass fertilized with nitrogen

Cited by 6 publications

References 24 publications

Nitrogen nutrition index and morphogenesis in Alexandergrass of the Central Depression of Rio Grande do Sul

Nitrogen nutrition index and morphogenesis in Alexandergrass of the Central Depression of Rio Grande do Sul

Intensive Production and Management of Marandu Palisadegrass (Urochloa brizantha ‘Marandu’) Accelerates Leaf Turnover but Does Not Change Herbage Mass

Forage intake by heifers on alexander grass (Urochloa plantaginea (Link.) Hitch) fertilized with different levels of nitrogen

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