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Morphogenesis of native grasses of Pampa Biome under nitrogen fertilization

2013; Sociedade Brasileira de Zootecnia; Volume: 42; Issue: 1 Linguagem: Inglês

10.1590/s1516-35982013000100004

1806-9290

Juliana Medianeira Machado, Marta Gomes da Rocha, Fernando Luíz Ferreira de Quadros, Anna Carolina Cerato Confortin, Aline Bosak dos Santos, Maria José de Oliveira Sichonany, Laila Arruda Ribeiro, Aline Tatiane Nunes da Rosa,

Growth and nutrition in plants

Morphogenetic and structural characteristics of the native grasses of the Pampa Biome Andropogon lateralis, Aristida laevis, Axonopus affinis, Erianthus angustifolius, Paspalum notatum, Paspalum plicatulum, Piptochaetium montevidense and Sorghastrum pellitum were evaluated as to the effect of nitrogen (N) fertilization (zero and 100 kg N/ha). The experimental design was of randomized blocks with three replicates in a 8 × 2 (native grasses × N) factorial arrangement. Accumulated thermal sums of 350 and 700 degree days determined the interval between cuts for prostrate and caespitose growth habit species, respectively. Species considered of resource conservation (A. laevis, E. angustifolius, P. plicatulum and S. pellitum) had the highest leaf elongation rate when they received N. For leaf appearance rate, phyllochron, leaf senescence rate, leaf lifespan, number of green leaves and final length of leaf blades, there was difference between the evaluated species.