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First indications on the development of Myzus persicae (Sulzer) (Rhynchota Aphididae) on different herbaceous species
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Estratti di trifoglio per la preparazione di agenti antiafide
No full textSi descrivono estratti di semi di specie di Trifoglio come insetticida ad azione aficida
Prime indicazioni sulla nematofauna dei vigneti in un comprensorio viticolo del Piemonte
No full textPreliminary results on the effect of transgenic apple encoding a cysteine proteinase inhibitor against Melolontha melolontha L. (Coleptera scarabaeidae ) on non target arthropods
No full textIndagini sulla diffusione di GFLV (Grapevine Fanleaf Virus) e di ArMV (Arabis Mosaic Virus) in un vigneto dell'Oltrepò pavese
No full textNematodes associated with the rhizosphere of corn (Zea mays L.)
No full textMost soil studies aim a better characterization of the system through indicators. In the present study nematofauna and soil structure were chosen as indicators to be assess soil health as related to agricultural practices. The field research was carried out on the two fodder cropping systems continuous maize (CM, Zea mays L.) and a 3-year rotation of silage-maize - silage-barley ( Hordeum vulgare L.) with Italian ryegrass (R3) and grain-maize maintained in these conditions for 18 years. Each crop system was submitted to two management options: (1) the high input level (H), done as a conventional tillage, (2) the low input level (L), where the tillage was replaced by harrowing and the manure was reduced by 30%. The effects of the two different cropping systems was assessed on soil nematofauna and soil physic parameters (structure or aggregate stability). Comparison was made of general composition, trophic structure and biodiversity of the nematofauna collected in both systems. Differences in nematode genera composition and distribution between the two systems were also recorded. The monoculture, compared to the three year rotation, had a negative influence on the nematofauna composition and its ecological succession. The Structural Stability Index (SSI) values indicate that both the cropping systems had a negative effect on the aggregate stability. The results indicate that nematofauna can be used to assess the effects of cropping systems on soil ecosystem, and therefore be considered a good indicator of soil health to integrate information from different chemical or physical indicators
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
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