Forage characters of different Paspalum species in Rio Grande do Sul: a meta-analysis

Abstract

The objective of this study was to evaluate, through meta-analysis, the forage characteristics of various species of the genus Paspalum and to use them to select the best ecotypes that can be used in artificial hybridization as parents and hybrids for pasture production and natural pasture recovery systems. Data were obtained from studies conducted by the Department of Forage Plants and Agrometeorology of the Universidade Federal do Rio Grande do Sul. Database comprised tests conducted with ecotypes and/or hybrids of Paspalum spp. in plots for evaluating total dry mass production, leaf dry mass production, and stem dry mass production by means of cuts. Total dry mass production, which included leaves and stems, differed between the ecotypes and hybrids. Hybrid H12 was the most divergent of all evaluated accessions. The greatest genetic divergence occurred due to dry mass production. Hybrids showed high total dry mass production, comprised mainly of leaves. Hybrid H12 and the accession of Paspalum lepton 28E were identified as the most dissimilar based on the generalized Mahalanobis distance using Tocher’s method. Total dry mass production is the characteristic that most contributed to the detection of genetic variability.

Nitrogen use efficiency and forage production in intraspecific hybrids of Paspalum notatum Flüggé

“…These results demonstrate the potential of the evaluated materials, especially the C22 hybrid, which was as productive as the native Bagual ecotype, a plant adapted to the soil and climate conditions of Rio Grande do Sul and recognized by its forage potential (Graminho et al, 2017). Thus, based on the TDM, it is possible to select the apomictic hybrid C22 for further evaluation, aiming its release as a cultivar in the future or its use as an elite recombinant in new hybridizations.…”

“…Lower total DM yield of 'Pensacola', compared to the ecotypes and the Paspalum hybrids, has been reported in several studies (Pereira et al, 2011;2012;Graminho et al, 2017). However, 'Pensacola', together with P. atratum 'Pojuca', are the only Paspalum cultivars available in the Brazilian market, and is therefore preferred for launching new Paspalum cultivars.…”

Effet résiduel de la fertilisation minérale et du stade phénologique sur la croissance et la biomasse de <i>Paspalum plicatulum</i>

“…Ceci pourrait s'expliquer par l'évolution du rapport C/N pour se retrouver dans la fourchette de l'équilibre idéal pour une bonne minéralisation à la deuxième année après l'application des différentes doses d'engrais composé . La bonne minéralisation de l'azote du sol par les microorganismes expliquerait les hauteurs des plantes comparables à la floraison et après grenaison (Tendonkeng et al, 2011), mais aussi à la capacité de Paspalum plicatulum de se développer sur des sols pauvres et acides (Machado, 2013 ;Graminho et al, 2017).…”

“…La variation de la biomasse de Paspalum plicatulum obtenue dans cette étude est proche des résultats obtenus par Graminho et al (2017) qui ont montré que la biomasse de Paspalum plicatulum. variait de 8 à 19 t MS/ha en fonction du niveau de fertilité du sol et des précipitations.…”

Dissimilarity between Andropogon lateralis ecotypes under different defoliation frequencies and heights

“…Morphological characteristics are commonly used to assess dissimilarity between ecotypes. These variables are commonly quantified in germplasm evaluations and characterization, and can be related to adaptability, stability and productive potential of the species/ecotype being evaluated (GRAMINHO et al, 2017;STRECK et al, 2017). In our study, the variables that most contributed to genetic dissimilarity were LS, NVT, SDM and PH, which accounted for 83.8% of the dissimilarity between the treatments imposed.…”