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The growth models may allow analysis of production components, providing an integrated overview of production. Moreover, the high biodiversity within grasslands gives them a high-ad...Au sein des territoires de polyculture-élevage, la prairie et les cultures fourragères pérennes jouent un rôle essentiel dans certaines fonctions environnementales, (i) maintien de la qualité des sols, (ii) régulation du cycle de l'azote et du carbone (iii) séquestration du carbone dans les sols (iv) maintien de la biodiversité .... Or, la gestion...Storage of carbohydrates in roots is important for lucerne survival and regrowth rate, begins during initial growth. In order to adjust models of biomass accumulation as a function of photosynthetically active radiation absorbed (P...Grasslands have to be considered not only as a means for human food production but also as a means for providing ecosystem services. Rotational or continuous stockings were evaluated under modera...The successful achievement of a highly productive understorey pasture in silvopastoral systems depends on the use of well-adapted forage genotypes, showing good agronomic performance and persistence under shading and grazing. L'étude se...Les prairies participent à la régulation des cycles biogéochimiques, notamment par l'accumulation de la matière organique dans les sols, la séquestration de C atmosphérique et l'atténuation des risques d'entraînement d'azote vers les hydrosystèmes. Menu. over-wintering state prior to the second season; immediately following bud burst; and on 12 further occasions throughout the In non-limiting situations for growth, with irrigation and high nitrogen fertilization, maize growth was higher than that of sorghum because the leaf area index of maize developed earlier...The -3/2 power rule, or -3/2 self-thinning rule, was accepted 10 years ago as an important generalization, but has recently been questioned by a number of authors. The model considers C and N acquisition, synthesis of assimilates and their transport and partitioning, growth of new tissues, reserve formation and recycling, and losses due to root exudatio...The critical nitrogen concentration of a plant can be defined as the minimum nitrogen concentration required for maximum growth rate at any time. The work tested whether nitrogen (N) fertiliser or irrigation (Irr) could manipulate the persistence strategies of these morphologica...L'autonomie protéique des élevages de ruminants passe par l'autonomie alimentaire globale des troupeaux du fait d'interactions étroites entre énergie et protéines. biodiversity in the soil-vegetation systems under different land...The environmental constraints to agriculture imply that nitrogen (N) fertilizer management should be adjusted to crop N requirements determined by target yields. In particula...Nitrogen (N) is often considered to be the most important limiting factor, after water deficiency, for biomass production in natural ecosystems. This diversity of conditions leads to large temporal and...In Chapter 1, the theory showed that a curve relating critical plant N% to crop dry weight could be determined for each type of crop, and that the N status of a crop could be estimated by the nitrogen nutrition index, which relates the actual plant N% to the critical N%. It highlights four important issues addressed across the different chapters: (i) trade-off between productivity and environment benefits of grasslands; (ii) functional and conservation role of grassland biodiversity; (iii) interactions of grassland areas with other...Grassland ecosystems are deeply affected by human activities and need appropriate management to optimise trade-offs between ecosystem functions and services.

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