期刊论文详细信息
Ciencia Rural | |
Índice de nutrição nitrogenada e morfogênese em papuã na Depressão Central do Rio Grande do Sul | |
article | |
Paulo Roberto Salvador1  Marta Gomes da Rocha1  Juliana Medianeira Machado1  Tuani Lopes Bergoli1  Juliana Missio Machado1  Diego Daniel Tiecher1  Juliana Brendler Hoerbe1  Luciana Pötter1  | |
[1]Universidade Federal de Santa Maria | |
关键词: Leaf appearance; leaf expansion; phyllochron; nitrogen fertilization; Urochloaplantaginea; | |
DOI : 10.1590/0103-8478cr20210783 | |
学科分类:农业科学(综合) | |
来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais | |
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【 摘 要 】
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.【 授权许可】
Unknown
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RO202307080000291ZK.pdf | 770KB | ![]() |