1,721,004 research outputs found
Valutazione dell’impiego di specie pratensi per la costituzione di “fasce tampone” all’interno del comprensorio agricolo del lago di Massaciuccoli (PI)
No full textThe Massaciuccoli lake is a water body of coastal formation, localized in the north-west of Tuscany. In several studies it has been emphasized the possible contribution of agriculture in the enrichment in nutrient and the silting of waters with consequences in water degradation. The introduction of buffer strips in one of the possible, concrete strategies to realize easily, without several changes in agricultural practices.
In order to test the effective reliability of a system of buffer strips inside the agricultural area, the comparison of some grassland cultivars, has been carried out. In particular were considered: three cultivars of Festuca arundinacea Schreb. (Apache, Arminda, Villageoise), two cultivars of Lolium perenne L. (Barrage, Palmer), one cultivar of Poa pratensis L. (Bartitia) and an intercropping of Festuca arundinacea Schreb. cv. Villageoise + Lolium perenne L. cv. Palmer. The sampling regarded the height of the grassland, the topsoil biomass, the content in nitrogen and phosphorus in vegetables, the land coverage by grasses and weeds. The cultivars Barrage, Palmer and the intercropping of Villageoise + Palmer seem the most suitable for the constitution of buffer strips in the referred area.
The verification of their effective action has been entrusted to a prototype, operating in laboratory, that is predisposed for the measure of the pulling-down ability of the soil and nutrient particles from the surface outflow.
The instrumental device evidences as a pulling-down effect is in relation to the presence of a vegetable cover, but the characteristics of the outflow (volume and speed) seem to meaningfully influence the effective action of the buffer strips
La gestione delle aree di rispetto dei pozzi idropotabili: come comporre cautele igienico-sanitarie e esigenze degli agricoltori?
No full textValutazione dell’impiego di specie pratensi per la costituzione di “fasce tampone” all’interno del comprensorio agricolo del lago di Massaciuccoli (PI
No full textCompetition for light affects alfalfa biomass production more than its nutritive value in an olive-based alley-cropping system
Full text linkCropping among trees with perennial legumes is one option for increasing agro-ecosystem services, such as improving the nitrogen supply and increasing soil protection by herbaceous vegeta-tion. Moreover, cropping under the canopy of olive trees should diversify the farm production, compared to the traditional fallow management. Among perennial legumes, alfalfa (Medicago sativa L.) produces abundant biomass under Mediterranean rainfed condition. Based on this, a two-year field experiment was implemented in southern Tuscany in a rainfed olive orchard to test the competition for light effects on alfalfa biomass production and nutritive value. Light availability under the tree canopy was measured by hemispherical photos. In both years, the alfalfa yield of under-canopy varied according to the tree presence. A significant relationship between biomass production and light availability was recorded. The nutritive value of under-canopy alfalfa was similar to that of the open-grown alfalfa. However, same significant differences did however occur, between shaded and sole crop. When differences were found, under-canopy herbage was characterised by a higher content of crude protein and a lower content of fibre with respect to open-grown. In a hilly silvoarable olive orchard, alfalfa biomass accumulation was reduced mainly due to scarce light availability, therefore tree management such as pruning and plantation layout can enhance the herbage productivity. Studying shade tolerant forage legumes in order to enhance the yield and nutritive value of herbage production in rainfed agroforestry systems is essential
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
La contaminazione da terbutilazina nei campi pozzi della piana di Lucca: aspetti agronomici e sanitari
No full text- …
