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- Title
Nitrogen nutrition index and morphogenesis in Alexandergrass of the Central Depression of Rio Grande do Sul.
- Authors
Roberto Salvador, Paulo; Gomes da Rocha, Marta; Medianeira Machado, Juliana; Lopes Bergoli, Tuani; Missio Machado, Juliana; Daniel Tiecher, Diego; Brendler Hoerbe, Juliana; Pötter, Luciana
- Abstract
This study assessed the nitrogen nutrition index, morphogenic characteristics and tiller structure of Alexandergrass (Urochloa plantaginea (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.
- Subjects
RIO Grande do Sul (Brazil : State); ROTATIONAL grazing; MORPHOGENESIS; NUTRITION; PLANT nutrition; LABORATORY animals; SIGNALGRASS; NITROGEN
- Publication
Ciência Rural, 2023, Vol 53, Issue 12, p1
- ISSN
0103-8478
- Publication type
Article
- DOI
10.1590/0103-8478cr20210783