trié(s) par (Pertinence décroissant(e), Titre croissant(e)) 

Effects of cutting or grazing grass swards on herbage yield, nitrogen uptake and residual soil nitrate at different levels of N fertilization / F. Nevens in Grass and forage science, vol.58, n°4 (Décembre 2003)

Public [article]  inGrass and forage science > vol.58, n°4 (Décembre 2003) . - pp. 431-449 Titre : Effects of cutting or grazing grass swards on herbage yield, nitrogen uptake and residual soil nitrate at different levels of N fertilization Type de document : texte imprimé Auteurs : F. Nevens, Auteur ; D. Rehuel, Auteur Année de publication : 2003 Article en page(s) : pp. 431-449 Langues : Anglais (eng) Catégories : [habitats/milieux] 3 - Landes, fruticées et prairies [Thèmes] Pédologie (sol) Mots-clés : gestion  pâturage  fauchage Résumé : "On a Flemish sandy loam soil, cut and grazed swards were compared at different levels of mineral nitrogen (N) fertilization. Economically optimal N fertilization rates were 400 (or more) and 200 kg N ha−1 yr−1 on cut and grazed swards respectively. Considering the amounts of residual soil nitrate-N in autumn, these N rates also met the current Flemish legal provisions, i.e. no more than 90 kg ha−1 nitrate-N present in the 0–90 cm soil layer, measured between 1 October and 15 November. The N use efficiency was considerably higher in cut grassland systems than in grazed systems, even when the animal component of a cut and conservation system was included. The results indicate that, for cut grasslands, two N application rates should be considered: intensively managed grasslands with high amounts of N (400 kg ha−1 yr−1 or more) or extensively managed grasslands with white clover and no more than 100 kg N ha−1 yr−1." (source : auteurs) Type de publication : périodique Référence biblio : Nevens F., Rehuel D., 2003 - Effects of cutting or grazing grass swards on herbage yield, nitrogen uptake and residual soil nitrate at different levels of N fertilization. Grass and forage science, 4 : 431-449. ID PMB : 58011 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=58011 [article]

Exemplaires(0)

Disponibilité
aucun exemplaire

More lightweight and isodiametric seeds for C4 than for C3 grasses are associated with preference for open habitats of C4 grasses in a temperate flora / P. Csontos in Grass and forage science, vol. 68, n°3 (Septembre 2013)

Public [article]  inGrass and forage science > vol. 68, n°3 (Septembre 2013) . - pp. 408-417 Titre : More lightweight and isodiametric seeds for C4 than for C3 grasses are associated with preference for open habitats of C4 grasses in a temperate flora Type de document : texte imprimé Auteurs : P. Csontos, Auteur ; T. Kalapos, Auteur Année de publication : 2013 Article en page(s) : pp. 408-417 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Poaceae Mots-clés : graine  masse des graines Résumé : "Seed mass and shape of grasses were analysed in a temperate flora containing 178 and 26 species belonging to C3 and C4 photosynthetic types respectively. The weedy character and the annual or perennial status were also considered. On the basis of the seed traits studied, three groups were distinguished: C4 grasses, annual C3 grasses of weedy character and perennial non-weedy C3 grasses. The C4 group had more isodiametric (same diameter in all directions) seed shape and lower average seed mass than the C3 group. To our knowledge, this has not yet been described for temperate C4 grasses and is certainly associated with their preference for open habitats where competition for light is small. Weedy annual C3 grasses had heavier and less isodiametric seeds than C4 grasses did. These species are mostly specialized to establish in the dense cover of perennial vegetation, and this ability distinguishes them from the C4 group. Non-weedy perennial C3 species possessed less isodiametric seeds than did C4 grasses, but did not differ from weedy annual C3 grasses. As most alien C4 grasses naturalized in Hungary are annuals with small, isodiametric seeds, these traits are good candidates to be included in screening for potential future invasives in open habitats." (source : auteurs) Type de publication : périodique Référence biblio : Csontos P., Kalapos T., 2013 - More lightweight and isodiametric seeds for C4 than for C3 grasses are associated with preference for open habitats of C4 grasses in a temperate flora. Grass and forage science, 68 (3) : 408-417. DOI : 10.1111/gfs.12003 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66120 [article]

Exemplaires(0)

Disponibilité
aucun exemplaire