Search results for "annual"
showing 10 items of 168 documents
Climats tropicaux d'aujourd'hui à demain : variabilité et changements
2008
Present and future tropical climates : their climate variability and their climate changes The oriffttality of tropical climates is re-examined under the light of climate variability and climate change, both present and future . The interannual variability of rainfall is on average larger in the tropics than in the extra-tropics, but it is also spatially more contrasted. Human communities have often responded to this constraint through efficient coping strategies. The regions showing the most variable climate do not necessarily have lower population densities, an indication that in the long run variability is not decisive. However, the recent demographic growth of these regions is often low…
Gestion du pâturage au printemps en système bovin allaitant : diversité des pratiques en Saône-et-Loire
2009
National audience; Grazed grass is the cheapest forage for making meat'. In order to incite farmers to make their forage systems more self-sufficient and thrifty, the 'Chambre d'Agriculture de Saone-et-Loire' (a professional agricultural organization for that departement) has been monitoring for five years the management of spring grazing on 23 farms. The analysis of farmers' practices lead to considerations as to put to the best use the grazed grass, according to the pedo-climatic conditions and the constraints of the farms. With the aim of optimizing the pasture resources in order to limit the purchase of concentrates and to cope with the climatic hazards, the study of the management of s…
Using coupled hidden markov chains to estimate colonization and seed bank survival in a metapopulation of annual plants
2022
The study of ecological systems is often impeded by components that escape perfect observation, such as the trajectories of moving animals or the status of plant seed banks. These hidden components can be efficiently handled with statistical modeling by using hidden variables, which are often called latent variables.Notably, the hidden variables framework enables us to model an underlying interaction structure between variables (including random effects in regression models) and perform data clustering, which are useful tools in the analysis of ecological data.This book provides an introduction to hidden variables in ecology, through recent works on statistical modeling as well as on estima…
The vegetation of temporary ponds of Sardinia
2009
The Mediterranean temporary ponds are considered priority habitat in the Directive 92/43/EEC (habitat n. 3170*) and detailed information on their floristic composition and susceptibility to invasive species seems a central issue for their preservation, because the development and maintenance of seasonal vegetation is merely the resultant of the development and maintenance of its component individuals. Sardinia presents fairly large extensions of land where such habitats are still well represented, thought not investigated in depth. Basing on literature and unpublished data, a survey on the current phytosociological knowledge of the temporary ponds of Sardinia is presented. Our field studies…
Integrated reporting: a new approach or a change of label?
2014
The aim of this paper is to provide insights into the early stage development of integrated reporting (IR). In particular, its purpose is to investigate whether it might represent a real new mode of corporate reporting or just a way to strengthen other financial and sustainability reports. The paper argues that connectivity of information is crucial to this distinction. Based on previous studies on corporate disclosure and on new research perspectives on IR, this paper shows the preliminary findings of a content analysis of the reports of a selected sample of companies. The first results that should be further researched highlight that more efforts need to be taken to shift IR from the trad…
Effects of nitrogen fertilization on efficiency and yield of a berseem clover-annual ryegrass intercrop in a Mediterranean environment
2004
Le relazioni annuali delle autorità amministrative indipendenti
2022
Nella notizia si dà conto delle relazioni annuali delle autorità amministrative indipendenti italiane It is a note about the annual reports of Italian Authorities
New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spalla…
2021
Abstract The violation of baryon number, B , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation ( n → n ̄ ) via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state ( n → [ n ′ , n ̄ ′ ] → n ̄ ), and neutron disappearan…
Berseem-annual ryegrass intercropping: effect of plant arrangement and seeding ratio on N2 fixation and yield
2005
Various agronomic factors can affect the productivity and the efficiency of legume-grass intercropping systems. This research was carried out in a Mediterranean semi-arid environment (37°30’N; 13°31’E; 178 m a.s.l.) with the aim to study on berseem clover- annual ryegrass mixture (Trifolium alexandrinum L. – Lolium multiflorum Lam subsp. wersterwoldicum) the effects of different plant arrangement (sowing of the two components in alternate rows or in the same row) and seeding ratios (100:0; 75:25; 50:50; 25:75; 0:100) on forage yield, nitrogen content and nitrogen fixation. The experimental design was a split-plot with four replications. The 15N isotope dilution technique was used to estimat…
Effect of defoliation management and plant arrangement on yield and N2 fixation of berseem-annual ryegrass mixture
2005
The research was carried out in a Mediterranean semi-arid environment on berseem clover, annual ryegrass and their mixture to study the effect of defoliation management [date of first cut (FC) 85, 119, 140, 169 days after sowing] and different plant arrangements (sowing the two components in alternate rows or in the same row) on yields, N content, N2 fixation and N transfer. The experimental design was a split-plot with four replications. The 15 N isotope dilution technique was used (8 kg N ha –1 as ammonium sulphate at 10 atom% 15 N excess) to evaluate the N2 fixation. Total seasonal DM yield was, on average, significantly higher for FC119 and FC140 (approx. 12.3 t ha –1 ) than for FC85 and FC…